Hi all, I've got a 3-node cluster in a lab environment running on ceph version 14.2.9 (containerized). Each node is running a OSD, MON, MGR, MDS and 2 x RGW (we're using a second RGW instance to host a pubsub endpoint). I've been monitoring my nodes with the ceph dashboard, and noticed that all of a sudden at random the CPU profile of my hosts completely changes from [iowait: 20%, user: 10%, system: 5%, others: <5%] to [user: 40%, system: 20%, iowait: 5%, others: <5%]. This isn't a spike; the CPU profile is still like this after several days. All hosts seem to be affected at the same moment. Running `top` on the hosts shows it's the OSD and one of the RGW processes (seems to be the pubsub process) that are using all the CPU: $ top top - 14:57:23 up 11 days, 22:26, 1 user, load average: 1.65, 1.81, 2.04 Tasks: 140 total, 2 running, 138 sleeping, 0 stopped, 0 zombie %Cpu(s): 40.9 us, 21.4 sy, 0.0 ni, 27.9 id, 5.9 wa, 0.0 hi, 4.0 si, 0.0 st KiB Mem : 12304036 total, 183596 free, 10848600 used, 1271840 buff/cache KiB Swap: 0 total, 0 free, 0 used. 1184676 avail Mem Change delay from 3.0 to PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 6541 167 20 0 5505324 205564 1380 S 67.8 1.7 4651:41 radosgw 3826 167 20 0 9563536 7.9g 5496 S 64.8 67.6 4609:05 ceph-osd 6621 167 20 0 5571764 276804 0 S 6.6 2.2 4985:30 radosgw 5524 167 20 0 1365368 322240 8516 S 3.7 2.6 171:37.23 ceph-mgr 1413 root 20 0 558728 28372 24968 S 0.3 0.2 18:56.05 rsyslogd .... If I restart the RGW instances (I think it's the pubsub instance specifically), CPU usage returns back to a normal level. I don't see any unusual logs (from the either RGW process or the OSD or MON processes) to indicate that anything has materially changed at the point the CPU elevates. Has anyone experienced anything like this? Beyond turning up RGW logging and trying to make sense of the output, I'm not sure where next to dig. Cheers, Dave