From d36847519738ca60fa09cef27d0b10230b0d1243 Mon Sep 17 00:00:00 2001 From: Jim Gauld Date: Wed, 16 Oct 2024 15:42:57 -0400 Subject: [PATCH] Configure systemd CPUShares/CPUQuota for pmon.service This updates CPUShares and CPUQuota for pmon.service. This gives reduced shares and quota since pmon.service has sporadic CPU usage yet is not latency critical. Significant hirunner CPU usage comes from various audits (unrelated to pmon process itself) running under the systemd pmon.service cgroup. For example: ceph health audit, ceph osd audit, can easily require 100% cpu for several seconds, often taking 30% occupancy for multiple seconds. This reduces pmon cgroup to 150 CPUShare from 1024 and sets CPUQUota 15%. This smoothes out behaviour of poorly behaved audits. This effectively slows down the audit behaviour by a few seconds due to throttling. This is part of an overall set of adjustments are required for systemd cgroups CPUShares, CPUQuota, and AllowedCPUs for key system services. This will improve latency of Kubernetes critical components, and throttles lesser important services. Partial-Bug: 2084714 TEST PLAN: AIO-SX, AIO-DX, Standard, Storage, DC, AIO-DX with ceph: - PASS: Fresh install - PASS: verify systemd parameters for pmon Example: systemctl show pmon.service | grep -e CPUShares -e CPUQuota AIO-SX, AIO-DX: - PASS: B&R AIO-DX: - PASS: K8S orchestrated upgrade 1.24 - 1.29 - TODO: controller swact Change-Id: I6ee5c6029c2a5a0fae26e9231401e4d4f1c016df Signed-off-by: Jim Gauld --- mtce/debian/deb_folder/pmon.service | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/mtce/debian/deb_folder/pmon.service b/mtce/debian/deb_folder/pmon.service index 44337bc0..1e9c9988 100644 --- a/mtce/debian/deb_folder/pmon.service +++ b/mtce/debian/deb_folder/pmon.service @@ -21,5 +21,10 @@ TimeoutStopSec=10s Restart=always RestartSec=2 +# cgroup engineering +CPUShares=150 +CPUQuota=15% +CPUQuotaPeriodSec=10ms + [Install] WantedBy=multi-user.target