Date: Tue, 5 Aug 2008 16:50:04 GMT From: Kris Kennaway <kris@FreeBSD.org> To: freebsd-bugs@FreeBSD.org Subject: Re: misc/126230: weird process cpu usage stats and weird load average Message-ID: <200808051650.m75Go4ba082147@freefall.freebsd.org>
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The following reply was made to PR misc/126230; it has been noted by GNATS. From: Kris Kennaway <kris@FreeBSD.org> To: Jakub Jasinski <jakub.jasinski@utoronto.ca> Cc: freebsd-gnats-submit@FreeBSD.org Subject: Re: misc/126230: weird process cpu usage stats and weird load average Date: Tue, 05 Aug 2008 18:48:57 +0200 Jakub Jasinski wrote: > I recompiled the kernel with the ULE scheduler and the only difference > now is that every 'working' process has higher WCPU _after_ rsync is > activated. Before rsync is activated all process have 0% WCPU. > > BTW, thanks for the help. > > [root@mail2 ~]# vmstat -i > interrupt total rate > irq1: atkbd0 78 0 > irq4: sio0 2023 5 > irq14: ata0 58 0 > irq16: uhci0 ehci0 1 0 > irq18: ciss0 uhci2 2618 6 > irq22: uhci4 19 0 > cpu0: timer 751994 1994 > irq257: bce1 2271 6 > cpu1: timer 744491 1974 > cpu2: timer 744494 1974 > cpu3: timer 744513 1974 > Total 2992560 7937 Your system is sharing an interrupt between the ciss and one of the USB controllers. This means that every time there is an interrupt from disk I/O the USB drivers will also wake up to process it. This could be causing things like moused and cups to run. What devices are attached to uhci2? Kris > (snipped top output:) > > 60 processes: 1 running, 59 sleeping > CPU states: 1.0% user, 0.0% nice, 38.4% system, 2.4% interrupt, 58.1% > Mem: 142M Active, 333M Inact, 284M Wired, 52K Cache, 214M Buf, 7154M Fre > Swap: 8192M Total, 8192M Free > > PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMM > 662 root 2 4 0 14112K 2504K select 1 0:10 13.43% apcu > 1020 root 1 55 0 17196K 12096K select 3 0:08 11.57% rsyn > 756 root 1 4 0 9940K 1260K select 2 0:05 7.08% auth > 498 root 1 4 0 5808K 1196K select 3 0:05 6.40% mous > 471 root 1 4 0 5808K 1196K select 0 0:04 5.86% mous > 890 mailnull 1 4 0 9252K 2024K select 0 0:04 5.08% mime > 981 root 1 4 0 30108K 5292K select 2 0:04 4.98% send > 969 admin 1 4 0 32936K 4608K select 1 0:04 4.88% sshd > 1001 admin 1 4 0 32936K 4612K select 1 0:04 4.88% sshd > 791 root 1 4 0 9940K 1260K select 3 0:04 4.88% auth > 613 root 1 4 0 4684K 1352K select 0 0:04 4.79% sysl > 784 root 1 4 0 3604K 1224K select 0 0:04 4.79% cour > 792 root 1 4 0 9940K 1260K select 2 0:04 4.79% auth > 1018 root 1 4 0 17196K 11808K select 0 0:04 4.69% rsyn > 793 root 1 4 0 9940K 1260K select 3 0:04 4.59% auth > 719 root 1 4 0 27284K 10392K select 2 0:04 4.59% perl > 799 root 1 4 0 3604K 1224K select 2 0:04 4.59% cour > 789 root 1 4 0 9940K 1260K select 1 0:04 4.49% auth > 790 root 1 4 0 9940K 1260K select 2 0:04 4.49% auth > 907 mailnull 2 20 0 4888K 1536K sigwai 1 0:04 4.49% mime > 833 root 1 4 0 20960K 3920K select 1 0:04 4.49% sshd > 774 root 1 4 0 3604K 1220K select 3 0:04 4.39% cour > > On Mon, 4 Aug 2008 17:00:11 GMT > Kris Kennaway <kris@freebsd.org> wrote: > >> The following reply was made to PR misc/126230; it has been noted by >> GNATS. >> >> From: Kris Kennaway <kris@FreeBSD.org> >> To: Jakub Jasinski <jakub.jasinski@utoronto.ca> >> Cc: freebsd-gnats-submit@FreeBSD.org >> Subject: Re: misc/126230: weird process cpu usage stats and weird >> load average Date: Mon, 04 Aug 2008 18:59:15 +0200 >> >> Jakub Jasinski wrote: >> > No. >> > >> > I ran ktrace on the processes and ktrace.out was empty. >> > >> > Read my follow up message: I already had a lengthy conversation >> > with Remko about this. >> > >> > NONE of the processes were running. The non-zero TIME is nonsense >> > as well and only accumulated after rsync was left running. >> >> That would be a very strange situation indeed, requiring multiple >> things to go wrong in bizarre ways. The more likely explanation is >> that the processes are in fact running and being reported correctly. >> >> Kris >> _______________________________________________ >> freebsd-bugs@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-bugs >> To unsubscribe, send any mail to >> "freebsd-bugs-unsubscribe@freebsd.org" > >help
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