EPYC™ System Management Interface (E-SMI) In-band Library

The EPYC™ System Management Interface In-band Library, or E-SMI library, is part of the EPYC™ System Management Inband software stack. It is a C library for Linux that provides a user space interface to monitor and control the CPU's power, energy, performance and other system management features.

Important note about Versioning and Backward Compatibility

The E-SMI library is currently under development, and therefore subject to change at the API level. The intention is to keep the API as stable as possible while in development, but in some cases we may need to break backwards compatibility in order to achieve future stability and usability. Following Semantic Versioning rules, while the E-SMI library is in a high state of change, the major version will remain 0, and achieving backward compatibility may not be possible.

Once new development has leveled off, the major version will become greater than 0, and backward compatibility will be enforced between major versions.

Building E-SMI

Dowloading the source

The source code for E-SMI library is available at Github.

Directory stucture of the source

Once the E-SMI library source has been cloned to a local Linux machine, the directory structure of source is as below:

$ docs/ Contains Doxygen configuration files and Library descriptions
$ tools/ Contains e-smi tool, based on the E-SMI library
$ include/ Contains the header files used by the E-SMI library
$ src/ Contains library E-SMI source
$ cmake_modules/ Contains helper utilities for determining package and library version
$ DEBIAN/ Contains debian pre and post installation scripts
$ RPM/ Contains rpm pre and post installation scripts

Building the library and tool

Building the library is achieved by following the typical CMake build sequence, as below

$ cd <location of root of E-smi library>
$ mkdir -p build
$ cd build
$ cmake ../

Building the library for static linking

Building the library as a static(.a) along with shared libraries(.so) is achieved by following sequence. The static library is part of RPM and DEB package when compiled with cmake as below and built with 'make package'.

$ cmake -DENABLE_STATIC_LIB=1 ../
$ make

Building the library and tool using clang compiler

$ cmake -DUSE_CLANG=1 ../
$ make

The built library libe_smi64_static.a, libe_smi64.so.X.Y and esmi_tool will appear in the build directory

$ sudo make install

Library file, header and tool are installed at /opt/e-sms

Note: Library is dependent on amd_hsmp.h header and without this, compilation will break. Please follow the instruction in "Kernel dependencies" section

Building the Documentation

The documentation PDF file can be built with the following steps (continued from the steps above) $ make doc Upon a successful build, the ESMI_Manual.pdf and ESMI_IB_Release_Notes.pdf will be copied to the top directory of the source.

Building the package

The RPM and DEB packages can be created with the following steps (continued from the steps above): $ make package

Kernel version dependency

Family 0x19 model 00-0fh a0-afh are supported from v5.16-rc7 onwards
Family 0x19 model 90-9fh are supported from v6.6-rc1 onwards
Family 0x1A model 00-1fh are supported from v6.5-rc5 onwards

Kernel driver dependencies

The E-SMI Library depends on the following device drivers from Linux to manage the system management features.

amd_hsmp driver

This is used to monitor and manage power metrics, boostlimits and other system management features. The power metrics, boostlimits and other features are managed by the SMU(System Management Unit of the processor) firmware and exposed via PCI config space and accessed through "Host System Management Port(HSMP)" at host/cpu side. AMD provides Linux kernel module(amd_hsmp) exposing this information to the user-space via ioctl interface.

amd_hsmp driver is accepted in upstream kernel and is available at linux tree at drivers/platform/x86/amd/hsmp.c from version 5.17.rc1 onwards either it can be compiled as part of kernel as a module or built in driver or as an out of tree module which is available at https://github.com/amd/amd_hsmp.git
E-smi compilation has dependency on amd_hsmp header file from uapi header of amd_hsmp driver. It should be available at
- /usr/include/asm/ on RHEL systems
- /usr/include/x86_64-linux-gnu/asm/ on Ubuntu systems. If its not present, it can be copied from amd_hsmp github repo or from the kernel source arch/x86/include/uapi/asm/amd_hsmp.h
There is always a dependency between E-smi and amd_hsmp driver versions. The new features of E-smi work only if there is a matching HSMP driver.

amd_hsmp/msr_safe/amd_energy/msr

One of these drivers is needed to monitor energy counters.

AMD family 19h, model 00-0fh and 30-3fh
- These processors support energy monitoring through 32 bit RAPL MSR registers.
- amd_energy driver, an out of tree kernel module, hosted at amd_energy can report per core and per socket counters via the HWMON sysfs entries.
- This driver provides accumulation of energy for avoiding wrap around problem.
- This is the only supported energy driver for 32bit RAPLS
AMD family 19h, model 10-1fh, a0-afh and 90-9fh, AMD family 0x1A, model 00-1fh
- These processors support energy monitoring through 64 bit RAPL MSR registers.
- Because of 64 bit registers, there is no accumulation of energy needed.
- For these processors either msr_safe, amd_energy or kernel's default msr driver can be used.
AMD family 1Ah, model 0x00-0x1f support RAPL reading using HSMP mailbox.
- For these processors either amd_hsmp driver or msr_safe driver or amd_energy driver or msr driver can be used.
- The order of checking for the availability of drivers in e-smi is as follows.
  - If amd_hsmp driver is present and supports RAPL reading, this is used for reading energy.
  - If amd_hsmp driver is not present/not supports energy reading, and msr-safe driver is present, this is used for reading energy. Msr-safe driver needs allowlist file to be written to "/dev/cpu/msr_allowlist" for allowing the read of those specific msr registers. Please follow below steps or use the tool option "writemsrallowlist" to write the allowlist file. Create "amd_allowlist" file with below contents and run the command "sudo su" and "cat amd_allowlist > /dev/cpu/msr_allowlist".
    - 0xC0010299 0x0000000000000000 # "ENERGY_PWR_UNIT_MSR"
    - 0xC001029A 0x0000000000000000 # "ENERGY_CORE_MSR"
    - 0xC001029B 0x0000000000000000 # "ENERGY_PKG_MSR"
    - Note: The first column above indicates MSR register address and 2nd column indicates write mask and the third coulmn is name of the register.
  - If msr_safe driver is not present, amd_energy driver is present, this is used for reading energy.
  - If msr_safe driver or amd_energy driver not present, msr driver will be used for reading energy.
  - Any one of msr_safe/amd_energy/msr driver is sufficient

BIOS dependency

To get HSMP working. PCIe interface needs to be enabled in the BIOS. On the reference BIOS please follow the sequence below for enabling HSMP.

Advanced > AMD CBS > NBIO Common Options > SMU Common Options > HSMP Support

BIOS Default: “Auto” (Disabled) to BIOS Default: "Enabled"

If the above HSMP support option is disabled, the related E-SMI APIs will return -ETIMEDOUT. The latest BIOS supports probing of HSMP driver through ACPI device. The ACPI supported amd_hsmp driver version is 2.2

Supported hardware

AMD Zen3 based CPU Family 19h Models 0h-Fh and 30h-3Fh.
AMD Zen4 based CPU Family 19h Models 10h-1Fh and A0-AFh.
AMD Zen4 based CPU Family 19h Models 90-9Fh.
AMD Zen4 based CPU Family 1Ah Models 00-1Fh.

Additional required software for building

In order to build the E-SMI library, the following components are required. Note that the software versions listed are what is being used in development. Earlier versions are not guaranteed to work:

CMake (v3.5.0)
gcc, g++, make
build-essential

In order to build the latest documentation, the following are required:

DOxygen (1.8.13)
latex (pdfTeX 3.14159265-2.6-1.40.18)

Library Usage Basics

Many of the functions in the library take a "core/socket index". The core/socket index is a number greater than or equal to 0, and less than the number of cores/sockets on the system. Number of cores/sockets in a system can be obtained from esmi library APIs.

Hello E-SMI

The only required E-SMI call for any program that wants to use E-SMI is the esmi_init() call. This call initializes some internal data structures that will be used by subsequent E-SMI calls.

When E-SMI is no longer being used, esmi_exit() should be called. This provides a way to do any releasing of resources that E-SMI may have held. In many cases, this may have no effect, but may be necessary in future versions of the library.

Below is a simple "Hello World" type program that display the Average Power of Sockets.

#include <stdio.h>
#include <stdint.h>
#include <e_smi/e_smi.h>
#include <e_smi/e_smi_monitor.h>

int main()
{
	esmi_status_t ret;
	unsigned int i;
	uint32_t power;
	uint32_t total_sockets = 0;

	ret = esmi_init();
	if (ret != ESMI_SUCCESS) {
		printf("ESMI Not initialized, drivers not found.\n"
			"Err[%d]: %s\n", ret, esmi_get_err_msg(ret));
		return ret;
	}

	total_sockets = esmi_get_number_of_sockets();
	for (i = 0; i < total_sockets; i++) {
		power = 0;
		ret = esmi_socket_power_get(i, &power);
		if (ret != ESMI_SUCCESS) {
			printf("Failed to get socket[%d] avg_power, "
				"Err[%d]:%s\n", i, ret, esmi_get_err_msg(ret));
		}
		printf("socket_%d_avgpower = %.3f Watts\n",
			i, (double)power/1000);
	}
	esmi_exit();

	return ret;
}

Tool Usage

E-SMI tool is a C program based on the E-SMI In-band Library, the executable "e_smi_tool" will be generated in the build/ folder. This tool provides options to Monitor and Control System Management functionality.

Below is a sample usage to dump core and socket metrics

	e_smi_library/b$ sudo ./e_smi_tool

	============================= E-SMI ===================================

	--------------------------------------
	| CPU Family            | 0x19 (25 ) |
	| CPU Model             | 0x10 (16 ) |
	| NR_CPUS               | 384        |
	| NR_SOCKETS            | 2          |
	| THREADS PER CORE      | 2 (SMT ON) |
	--------------------------------------

	------------------------------------------------------------------------
	| Sensor Name                    | Socket 0         | Socket 1         |
	------------------------------------------------------------------------
	| Energy (K Joules)              | 14437.971        | 14087.151        |
	| Power (Watts)                  | 174.290          | 169.630          |
	| PowerLimit (Watts)             | 400.000          | 320.000          |
	| PowerLimitMax (Watts)          | 400.000          | 320.000          |
	| C0 Residency (%)               | 0                | 0                |
	| DDR Bandwidth                  |                  |                  |
	|       DDR Max BW (GB/s)        | 58               | 58               |
	|       DDR Utilized BW (GB/s)   | 0                | 0                |
	|       DDR Utilized Percent(%)  | 0                | 0                |
	| Current Active Freq limit      |                  |                  |
	|        Freq limit (MHz)        | 3500             | 3500             |
	|        Freq limit source       | Refer below[*0]  | Refer below[*1]  |
	| Socket frequency range         |                  |                  |
	|        Fmax (MHz)              | 3500             | 3500             |
	|        Fmin (MHz)              | 400              | 400              |
	------------------------------------------------------------------------

	-----------------------------------------------------------------------------------------------------------------
	| CPU energies in Joules:                                                                                       |
	| cpu [  0] :    645.992    181.415    171.678    165.577    161.001    158.397    161.333    151.716           |
	| cpu [  8] :     88.197     79.306     73.860     73.015     72.960     69.293     67.871     78.895           |
	| cpu [ 16] :     70.376     71.231     61.756     63.061     80.656     73.360     69.566     69.969           |
	| cpu [ 24] :     67.054     65.621     64.468     66.346     64.344     64.310     71.548     65.579           |
	| cpu [ 32] :     65.731     62.931     65.526     69.765     69.050     65.782     70.630     65.282           |
	| cpu [ 40] :     69.608     67.261     63.765     69.477     68.677     63.145     62.451    159.949           |
	| cpu [ 48] :     70.810     73.084     64.584     62.966     66.581     65.620     62.381     65.602           |
	| cpu [ 56] :     72.804     70.842     69.651     64.990     63.924     66.468     63.401    296.924           |
	| cpu [ 64] :     64.693     62.723     65.057     62.515     60.091     60.422     62.217     66.552           |
	| cpu [ 72] :     81.746     70.622     68.848    301.949     78.974     68.130     68.141     65.693           |
	| cpu [ 80] :     77.475     72.441     81.296     71.441     71.988     75.237     73.986     69.467           |
	| cpu [ 88] :     73.385     69.277     61.759     61.060     62.834     60.681     62.835     62.703           |
	| cpu [ 96] :    142.718    139.519    134.449    134.097    135.045    140.307    140.553    137.153           |
	| cpu [104] :     66.016     66.736     62.224     67.137     64.881     70.592     64.701     64.056           |
	| cpu [112] :     70.791     69.107     70.638     69.998     68.199     65.263     70.638     72.557           |
	| cpu [120] :     94.391     94.151     71.881     66.493     64.653     66.141     66.132     69.593           |
	| cpu [128] :     65.800     64.742     63.130     61.771     65.416     66.205     64.663     71.349           |
	| cpu [136] :     72.183     66.754     67.090     63.343     69.450     67.979     68.285     70.478           |
	| cpu [144] :     68.281     63.809     62.717     63.348     71.164     72.289     65.516     65.513           |
	| cpu [152] :     74.588     69.074     66.711     66.011     67.896     65.933     67.031     65.474           |
	| cpu [160] :     66.668     62.996     65.945     63.734     64.060     68.597     76.405     91.436           |
	| cpu [168] :     77.658     70.085     67.025     68.951     64.678     64.821     65.031     71.694           |
	| cpu [176] :     72.782     89.196     74.777     73.703     66.247     65.419     64.748     63.978           |
	| cpu [184] :     63.887     66.080     64.042     65.151     69.661     74.616     63.834     69.824           |
	-----------------------------------------------------------------------------------------------------------------

	-----------------------------------------------------------------------------------------------------------------
	| CPU boostlimit in MHz:                                                                                        |
	| cpu [  0] : 3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500    |
	| cpu [ 16] : 3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500    |
	| cpu [ 32] : 3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500    |
	| cpu [ 48] : 3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500    |
	| cpu [ 64] : 3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500    |
	| cpu [ 80] : 3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500    |
	| cpu [ 96] : 3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500    |
	| cpu [112] : 3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500    |
	| cpu [128] : 3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500    |
	| cpu [144] : 3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500    |
	| cpu [160] : 3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500    |
	| cpu [176] : 3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500    |
	-----------------------------------------------------------------------------------------------------------------

	-----------------------------------------------------------------------------------------------------------------
	| CPU core clock current frequency limit in MHz:                                                                |
	| cpu [  0] : 3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500  3500    |
	| cpu [ 16] : NA    NA    NA    NA    NA    NA    NA    NA    3500  3500  3500  3500  3500  3500  3500  3500    |
	| cpu [ 32] : 3500  3500  3500  3500  3500  3500  3500  3500  NA    NA    NA    NA    NA    NA    NA    NA      |
	| cpu [ 48] : 3500  3500  3500  3500  3500  3500  3500  3500  NA    NA    NA    NA    NA    NA    NA    NA      |
	| cpu [ 64] : NA    NA    NA    NA    NA    NA    NA    NA    3500  3500  3500  3500  3500  3500  3500  3500    |
	| cpu [ 80] : NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA      |
	| cpu [ 96] : NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA      |
	| cpu [112] : NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA      |
	| cpu [128] : NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA      |
	| cpu [144] : NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA      |
	| cpu [160] : NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA      |
	| cpu [176] : NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA    NA      |
	-----------------------------------------------------------------------------------------------------------------
	*0 Frequency limit source names:
	OPN Max

	*1 Frequency limit source names:
	OPN Max



	Try `./e_smi_tool --help' for more information.

For detailed and up to date usage information, we recommend consulting the help:

For convenience purposes, following is the output from the -h flag on hsmp protocol version 7 based system:


	============================= E-SMI ===================================

	Usage: ./e_smi_tool [Option]... <INPUT>...

	Output Option<s>:
	  -h, --help                                                    Show this help message
	  -A, --showall                                                 Show all esmi parameter values
	  -V  --version                                                 Show e-smi library version
	  --testmailbox [SOCKET] [VALUE<0-0xFFFFFFFF>]                  Test HSMP mailbox interface
	  --writemsrallowlist                                           Write msr-safe allowlist file

	Get Option<s>:
	  --showcoreenergy [CORE]                                       Show energy for a given CPU (Joules)
	  --showsockenergy                                              Show energy for all sockets (KJoules)
	  --showsockpower                                               Show power metrics for all sockets (Watts)
	  --showcorebl [CORE]                                           Show Boostlimit for a given CPU (MHz)
	  --showsockc0res [SOCKET]                                      Show c0_residency for a given socket (%%)
	  --showsmufwver                                                Show SMU FW Version
	  --showhsmpprotover                                            Show HSMP Protocol Version
	  --showprochotstatus                                           Show HSMP PROCHOT status for all sockets
	  --showclocks                                                  Show Clock Metrics (MHz) for all sockets
	  --showddrbw                                                   Show DDR bandwidth details (Gbps)
	  --showdimmtemprange [SOCKET] [DIMM_ADDR]                      Show dimm temperature range and refresh rate for a given socket and dimm address
	  --showdimmthermal [SOCKET] [DIMM_ADDR]                        Show dimm thermal values for a given socket and dimm address
	  --showdimmpower [SOCKET] [DIMM_ADDR]                          Show dimm power consumption for a given socket and dimm address
	  --showcclkfreqlimit [CORE]                                    Show current clock frequency limit(MHz) for a given core
	  --showsvipower                                                Show svi based power telemetry of all rails for all sockets
	  --showiobw [SOCKET] [LINK<P0-P3,G0-G3>]                       Show IO aggregate bandwidth for a given socket and linkname
	  --showlclkdpmlevel [SOCKET] [NBIOID<0-3>]                     Show lclk dpm level for a given nbio in a given socket
	  --showsockclkfreqlimit [SOCKET]                               Show current clock frequency limit(MHz) for a given socket
	  --showxgmibw [LINK<P1,P3,G0-G3>] [BW<AGG_BW,RD_BW,WR_BW>]     Show xGMI bandwidth for a given socket, linkname and bwtype
	  --showcurrpwrefficiencymode [SOCKET]                          Show current power effciency mode
	  --showcpurailisofreqpolicy [SOCKET]                           Show current CPU ISO frequency policy
	  --showdfcstatectrl [SOCKET]                                   Show current DF C-state status

	Set Option<s>:
	  --setpowerlimit [SOCKET] [POWER]                              Set power limit for a given socket (mWatts)
	  --setcorebl [CORE] [BOOSTLIMIT]                               Set boost limit for a given core (MHz)
	  --setsockbl [SOCKET] [BOOSTLIMIT]                             Set Boost limit for a given Socket (MHz)
	  --apbdisable [SOCKET] [PSTATE<0-2>]                           Set Data Fabric Pstate for a given socket
	  --apbenable [SOCKET]                                          Enable the Data Fabric performance boost algorithm for a given socket
	  --setxgmiwidth [MIN<0-2>] [MAX<0-2>]                          Set xgmi link width in a multi socket system (MAX >= MIN)
	  --setlclkdpmlevel [SOCKET] [NBIOID<0-3>] [MIN<0-3>] [MAX<0-3>]Set lclk dpm level for a given nbio in a given socket (MAX >= MIN)
	  --setpcielinkratecontrol [SOCKET] [CTL<0-2>]                  Set rate control for pcie link for a given socket
	  --setdfpstaterange [SOCKET] [MAX<0-2>] [MIN<0-2>]             Set df pstate range for a given socket (MAX <= MIN)
	  --setgmi3linkwidth [SOCKET] [MIN<0-2>] [MAX<0-2>]             Set gmi3 link width for a given socket (MAX >= MIN)
	  --setpowerefficiencymode [SOCKET] [MODE<0-5>]                 Set power efficiency mode for a given socket
	  --setxgmipstaterange [MAX<0,1>] [MIN<0,1>]                    Set xgmi pstate range
	  --setcpurailisofreqpolicy [SOCKET] [VAL<0,1>]                 Set CPU ISO frequency policy
	  --dfcctrl [SOCKET] [VAL<0,1>]                                 Enable or disable DF c-state

	============================= End of E-SMI ============================

Following are the value ranges and other information needed for passing it to tool

1.	----showxgmibw [SOCKET] [LINKNAME] [BWTYPE]

	  LINKNAME :
	  Rolling Stones:P0/P1/P2/P3/G0/G1/G2/G3
	  Mi300:G0/G1/G2/G3/G4/G5/G6/G7
	  Family 0x1A, model 0x00-0x1F:P1/P3/G0/G1/G2/G3

	  BWTYPE : AGG_BW/RD_BW/WR_BW

2.	--setxgmiwidth [MIN] [MAX]

	  MIN : MAX :  0 - 2 with MIN <= MAX

3.	--showlclkdpmlevel [SOCKET] [NBIOID]

	  NBIOID : 0 - 3

4.	--apbdisable [SOCKET] [PSTATE]

	  PSTATE : 0 - 2

5.	--setlclkdpmlevel [SOCKET] [NBIOID] [MIN] [MAX]

	  NBIOID : 0 - 3

	  MI300A:  MIN : MAX : 0 - 2 with MIN <= MAX
	  Other platforms: MIN : MAX : 0 - 3 with MIN <= MAX

6. 	--setpcielinkratecontrol [SOCKET] [CTL]

	  CTL : 0 - 2

7.	--setpowerefficiencymode [SOCKET] [MODE]

	  Rolling Stones: MODE : 0 - 3
	  Family 0x1A model 0x00-0x1F: MODE : 0 - 5

8.	--setdfpstaterange [SOCKET] [MAX] [MIN]

	  MIN : MAX : 0 - 2 with MAX <= MIN

9.	--setgmi3linkwidth [SOCKET] [MIN] [MAX]

	  MIN : MAX : 0 - 2 with MIN <= MAX

10.	--testmailbox [SOCKET] [VALUE]
	  VALUE : Any 32 bit value

Below is a sample usage to get different system metrics information


1.	e_smi_library/b$ sudo ./e_smi_tool --showcoreenergy 0

	============================= E-SMI ===================================

	-------------------------------------------------
	| core[000] energy  |           646.549 Joules  |
	-------------------------------------------------

	============================= End of E-SMI ============================

2.	e_smi_library/b$ sudo ./e_smi_tool --showcoreenergy 12 --showsockpower --setpowerlimit 1 220000 --showsockpower

	============================= E-SMI ===================================

	-------------------------------------------------
	| core[012] energy  |            73.467 Joules  |
	-------------------------------------------------

	------------------------------------------------------------------------
	| Sensor Name                    | Socket 0         | Socket 1         |
	------------------------------------------------------------------------
	| Power (Watts)                  | 174.051          | 169.451          |
	| PowerLimit (Watts)             | 400.000          | 220.000          |
	| PowerLimitMax (Watts)          | 400.000          | 320.000          |
	------------------------------------------------------------------------

	Socket[1] power_limit set to 220.000 Watts successfully

	------------------------------------------------------------------------
	| Sensor Name                    | Socket 0         | Socket 1         |
	------------------------------------------------------------------------
	| Power (Watts)                  | 174.085          | 169.431          |
	| PowerLimit (Watts)             | 400.000          | 220.000          |
	| PowerLimitMax (Watts)          | 400.000          | 320.000          |
	------------------------------------------------------------------------

3. 	e_smi_library/b$$ ./e_smi_tool --showxgmibandwidth G2 AGG_BW

	============================= E-SMI ===================================


	-------------------------------------------------------------
	| Current Aggregate bandwidth of xGMI link G2 |     40 Mbps |
	-------------------------------------------------------------

	============================= End of E-SMI ============================

4.	e_smi_library/b$sudo ./e_smi_tool --setdfpstaterange 0 1 2
	[sudo] password for user:

	============================= E-SMI ===================================

	Data Fabric PState range(max:1 min:2) set successfully

	============================= End of E-SMI ============================

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EPYC™ System Management Interface (E-SMI) In-band Library

Important note about Versioning and Backward Compatibility

Building E-SMI

Dowloading the source

Directory stucture of the source

Building the library and tool

Building the Documentation

Building the package

Kernel version dependency

Kernel driver dependencies

amd_hsmp driver

amd_hsmp/msr_safe/amd_energy/msr

BIOS dependency

Supported hardware

Additional required software for building

Library Usage Basics

Hello E-SMI

Tool Usage

About

Releases

Packages

Contributors 5

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Name		Name	Last commit message	Last commit date
Latest commit History 179 Commits
DEBIAN		DEBIAN
RPM		RPM
cmake_modules		cmake_modules
docs		docs
include/e_smi		include/e_smi
src		src
tools		tools
CMakeLists.txt		CMakeLists.txt
ESMI_IB_Release_Notes.pdf		ESMI_IB_Release_Notes.pdf
ESMI_Manual.pdf		ESMI_Manual.pdf
License.txt		License.txt
package.txt		package.txt

License

amd/esmi_ib_library

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Repository files navigation

EPYC™ System Management Interface (E-SMI) In-band Library

Important note about Versioning and Backward Compatibility

Building E-SMI

Dowloading the source

Directory stucture of the source

Building the library and tool

Building the Documentation

Building the package

Kernel version dependency

Kernel driver dependencies

amd_hsmp driver

amd_hsmp/msr_safe/amd_energy/msr

BIOS dependency

Supported hardware

Additional required software for building

Library Usage Basics

Hello E-SMI

Tool Usage

About

Resources

License

Stars

Watchers

Forks

Releases

Packages 0

Contributors 5

Languages

Packages