Changelog: add mention of memlock requirement for io_uring (#6702)

* Changelog: add mention of memlock requirement for io_uring

* Add memlock to docs and install-docker.sh

CHANGELOG.md

@@ -31,6 +31,9 @@ Release channels have their own copy of this changelog:
 * Deprecated snapshot archive formats have been removed and are no longer loadable.
 * Using `--snapshot-interval-slots 0` to disable generating snapshots has been removed. Use `--no-snapshots` instead.
 
+#### Changes
+* Reading snapshot archives requires increased `memlock` limits - recommended setting is `LimitMEMLOCK=2000000000` in systemd service configuration. Lack of sufficient limit will result slower startup times.
+
 ## 2.3.0
 
 ### Validator

docs/src/operations/guides/validator-start.md

@@ -70,6 +70,7 @@ Add
 
 ```
 LimitNOFILE=1000000
+LimitMEMLOCK=2000000000
 ```
 
 to the `[Service]` section of your systemd service file, if you use one,
@@ -77,6 +78,7 @@ otherwise add
 
 ```
 DefaultLimitNOFILE=1000000
+DefaultLimitMEMLOCK=2000000000
 ```
 
 to the `[Manager]` section of `/etc/systemd/system.conf`.
@@ -89,6 +91,8 @@ sudo systemctl daemon-reload
 sudo bash -c "cat >/etc/security/limits.d/90-solana-nofiles.conf <<EOF
 # Increase process file descriptor count limit
 * - nofile 1000000
+# Increase memory locked limit (kB)
+* - memlock 2000000
 EOF"
 ```
 
@@ -358,6 +362,7 @@ Restart=always
 RestartSec=1
 User=sol
 LimitNOFILE=1000000
+LimitMEMLOCK=2000000000
 LogRateLimitIntervalSec=0
 Environment="PATH=/bin:/usr/bin:/home/sol/.local/share/solana/install/active_release/bin"
 ExecStart=/home/sol/bin/validator.sh

docs/src/operations/setup-a-validator.md

@@ -330,6 +330,7 @@ Add
 
 ```
 LimitNOFILE=1000000
+LimitMEMLOCK=2000000000
 ```
 
 to the `[Service]` section of your systemd service file, if you use one,
@@ -337,6 +338,7 @@ otherwise add
 
 ```
 DefaultLimitNOFILE=1000000
+DefaultLimitMEMLOCK=2000000000
 ```
 
 to the `[Manager]` section of `/etc/systemd/system.conf`.
@@ -349,6 +351,8 @@ sudo systemctl daemon-reload
 sudo bash -c "cat >/etc/security/limits.d/90-solana-nofiles.conf <<EOF
 # Increase process file descriptor count limit
 * - nofile 1000000
+# Increase memory locked limit (kB)
+* - memlock 2000000
 EOF"
 ```
 

net/scripts/install-docker.sh

@@ -53,6 +53,7 @@ StartLimitInterval=60s
 LimitNOFILE=infinity
 LimitNPROC=infinity
 LimitCORE=infinity
+LimitMEMLOCK=infinity
 
 # Comment TasksMax if your systemd version does not support it.
 # Only systemd 226 and above support this option.