Add io-threads-do-reads config to deprecated config table to have no effect.

src/config.c

@@ -444,6 +444,7 @@ void loadServerConfigFromString(char *config) {
         {"list-max-ziplist-entries", 2, 2},
         {"list-max-ziplist-value", 2, 2},
         {"lua-replicate-commands", 2, 2},
+        {"io-threads-do-reads", 2, 2},
         {NULL, 0},
     };
     char buf[1024];
@@ -3086,7 +3087,6 @@ standardConfig static_configs[] = {
     /* Bool configs */
     createBoolConfig("rdbchecksum", NULL, IMMUTABLE_CONFIG, server.rdb_checksum, 1, NULL, NULL),
     createBoolConfig("daemonize", NULL, IMMUTABLE_CONFIG, server.daemonize, 0, NULL, NULL),
-    createBoolConfig("io-threads-do-reads", NULL, DEBUG_CONFIG | IMMUTABLE_CONFIG, server.io_threads_do_reads, 1, NULL, NULL), /* Read + parse from threads */
     createBoolConfig("always-show-logo", NULL, IMMUTABLE_CONFIG, server.always_show_logo, 0, NULL, NULL),
     createBoolConfig("protected-mode", NULL, MODIFIABLE_CONFIG, server.protected_mode, 1, NULL, NULL),
     createBoolConfig("rdbcompression", NULL, MODIFIABLE_CONFIG, server.rdb_compression, 1, NULL, NULL),

src/io_threads.c

@@ -319,7 +319,6 @@ void initIOThreads(void) {
 
 int trySendReadToIOThreads(client *c) {
     if (server.active_io_threads_num <= 1) return C_ERR;
-    if (!server.io_threads_do_reads) return C_ERR;
     /* If IO thread is areadty reading, return C_OK to make sure the main thread will not handle it. */
     if (c->io_read_state != CLIENT_IDLE) return C_OK;
     /* Currently, replica/master writes are not offloaded and are processed synchronously. */

src/server.h

@@ -1744,7 +1744,6 @@ struct valkeyServer {
     _Atomic uint64_t next_client_id;          /* Next client unique ID. Incremental. */
     int protected_mode;                       /* Don't accept external connections. */
     int io_threads_num;                       /* Number of IO threads to use. */
-    int io_threads_do_reads;                  /* Read and parse from IO threads? */
     int active_io_threads_num;                /* Current number of active IO threads, includes main thread. */
     int events_per_io_thread;                 /* Number of events on the event loop to trigger IO threads activation. */
     int prefetch_batch_max_size;              /* Maximum number of keys to prefetch in a single batch */

tests/unit/introspection.tcl

@@ -514,7 +514,6 @@ start_server {tags {"introspection"}} {
         set skip_configs {
             rdbchecksum
             daemonize
-            io-threads-do-reads
             tcp-backlog
             always-show-logo
             syslog-enabled

valkey.conf

@@ -1354,7 +1354,11 @@ lazyfree-lazy-user-flush yes
 #
 # prefetch-batch-max-size 16
 #
-# NOTE: If you want to test the server speedup using valkey-benchmark, make
+# NOTE:
+# 1. 'io-threads-do-reads' config is deprecated and will be removed in the future,
+# please avoid using this option if possible.
+#
+# 2. If you want to test the server speedup using valkey-benchmark, make
 # sure you also run the benchmark itself in threaded mode, using the
 # --threads option to match the number of server threads, otherwise you'll not
 # be able to notice the improvements.