Linux kernel cgroups writeback high CPU troubleshooting
(dasl.cc)
We’ve been upgrading the operating system from CentOS to Ubuntu on hosts across our fleet. Our CentOS hosts run an outdated Linux kernel version (3.10), whereas our Ubuntu hosts run a more modern kernel version (6.8). In August 2024, we began rolling out the Ubuntu upgrade across our Apache web servers. When we migrated larger portions of our fleet to Ubuntu, we began seeing elevated listen overflow errors.
We’ve been upgrading the operating system from CentOS to Ubuntu on hosts across our fleet. Our CentOS hosts run an outdated Linux kernel version (3.10), whereas our Ubuntu hosts run a more modern kernel version (6.8). In August 2024, we began rolling out the Ubuntu upgrade across our Apache web servers. When we migrated larger portions of our fleet to Ubuntu, we began seeing elevated listen overflow errors.