On 2016-09-19 16:08, Tomasz Chmielewski wrote:
On several servers running 4.7.x and 4.8-rc6/7 kernels I'm seeing thousands of kworker processes. # ps auxf|grep -c kworker 2104 Load average goes into hundreds on a pretty much idle server (biggest CPU and RAM consumers are probably SSHD with one user logged in and rsyslog writing ~1 line per minute): # uptime 06:58:56 up 26 min, 1 user, load average: 146.11, 215.46, 105.70 # uptime 06:59:48 up 26 min, 1 user, load average: 305.20, 240.84, 120.25 Sometimes seeing lots of them in "D" state: root 19474 0.0 0.0 0 0 ? D 06:54 0:00 \_ [kworker/0:208] root 19475 0.0 0.0 0 0 ? D 06:54 0:00 \_ [kworker/0:209]
I did some experiments to see when the problem first appeared. Thousands of kworker processes start to show up in 4.7.0-rc5.
kernel version | kworker count after boot ------------------------------------------- 4.6.3 37 4.6.4 47 4.6.5 46 4.6.6 49 4.6.7 49 4.7.0-rc1 46 4.7.0-rc2 49 4.7.0-rc3 45 4.7.0-rc4 47 4.7.0-rc5 1592 4.7.0-rc6 1714 4.7.0-rc7 1955 4.7.0 2088 4.7.1 1222 4.7.2 1699 4.7.3 1446 4.7.4 1781 4.8-rc1 (not tested) 4.8-rc2 2012 4.8-rc3 1696 4.8-rc4 1210 4.8-rc5 1890 4.8-rc6 1657 4.8-rc7 1647 Tomasz Chmielewski https://lxadm.com
