Happy to report that 2.10.4 fixed this issue. Cheers, Hans Henrik
On 06-04-2018 14:48, Hans Henrik Happe wrote: > Just for the record. 2.11.0 has fixed this. Not sure which LU though. > > Cheers, > Hans Henrik > > On 30-09-2017 23:43, Hans Henrik Happe wrote: >> On 27-09-2017 18:50, Dilger, Andreas wrote: >>> On Sep 26, 2017, at 01:10, Hans Henrik Happe<[email protected]> wrote: >>>> Hi, >>>> >>>> Did anyone else experience CPU load from ksoftirqd after 'modprobe >>>> lustre'? On an otherwise idle node I see: >>>> >>>> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND >>>> 9 root 20 0 0 0 0 S 28.5 0.0 2:05.58 ksoftirqd/1 >>>> >>>> >>>> 57 root 20 0 0 0 0 R 23.9 0.0 2:22.91 >>>> ksoftirqd/13 >>>> >>>> The sum of those two is about 50% CPU. >>>> >>>> I have narrowed it down to the ptlrpc module. When I remove that, it >>>> stops. >>>> >>>> I also tested the 2.10.1-RC1, which is the same. >>> If you can run "echo l > /proc/sysrq-trigger" it will report the >>> processes >>> that are currently running on the CPUs of your system to the console >>> (and >>> also /var/log/messages, if it can write everything in time). >>> >>> You might need to do this several times to get a representative >>> sample of >>> the ksoftirqd process stacks to see what they are doing that is >>> consuming >>> so much CPU. >>> >>> Alternately, "echo t > /proc/sysrq-trigger" will report the stacks of >>> all >>> processes to the console (and /v/l/m), but there will be a lot of them, >>> and no better chance that it catches what ksoftirqd is doing 25% of >>> the time. >> I've attached the stacks. Some wakeup which I guess are initiated by >> something in the ptlrpc code. >> >> Cheers, >> Hans Henrik >> >> >> >> >> _______________________________________________ >> lustre-discuss mailing list >> [email protected] >> http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org >> > _______________________________________________ > lustre-discuss mailing list > [email protected] > http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org _______________________________________________ lustre-discuss mailing list [email protected] http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
