Date: Tue, 5 Aug 2008 18:10:03 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: <200808051810.m75IA3Jh088533@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 20:08:36 +0200 Jakub Jasinski wrote: > uhci2: <Intel 631XESB/632XESB/3100 USB controller USB-3> port > 0x1040-0x105f irq 18 at device 29.2 on pci0 uhci2: [GIANT-LOCKED] > uhci2: [ITHREAD] > usb2: <Intel 631XESB/632XESB/3100 USB controller USB-3> on uhci2 > usb2: USB revision 1.0 > uhub2: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb2 > uhub2: 2 ports with 2 removable, self powered > ukbd0: <No brand KVM A1, class 0/0, rev 1.10/0.00, addr 2> on uhub2 > kbd2 at ukbd0 > ums0: <No brand KVM A1, class 0/0, rev 1.10/0.00, addr 2> on uhub2 > ums0: 5 buttons and Z dir. > > Ok, so the keyboard and mouse are there. I detached them, killed > moused, rerun rsync and I got the same weird top output: Are the devices still attached (i.e. did they detach)? What if you compile a kernel with no USB support at all (obviously you won't be able to log in with a USB keyboard, but you can still log in remotely). Kris > > FreeBSD 7.0-RELEASE (CUSTOM) #2: Mon Aug 4 12:44:23 EDT 2008 > last pid: 1258; load averages: 0.00, 0.00, 0.00 up 0+01:09:53 > 13:20:17 last pid: 1266; load averages: 1.98, 0.55, 0.20 up 0 > +01:11:33 13:21:57 58 processes: 1 running, 57 sleeping > CPU states: 0.9% user, 0.0% nice, 36.0% system, 3.5% interrupt, > 59.6% idle Mem: 142M Active, 59M Inact, 278M Wired, 48K Cache, 214M > Buf, 7433M Free Swap: 8192M Total, 8192M Free > > PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU > COMMAND > 662 root 2 4 0 14112K 2504K select 3 0:15 12.65% apcupsd > 1266 root 1 54 0 17196K 12112K select 0 0:03 10.50% rsync > 756 root 1 4 0 9940K 1260K select 2 0:08 6.40% authdaemon > 1259 root 1 48 0 7656K 2328K CPU1 1 0:02 5.27% top > 981 root 1 4 0 30108K 5292K select 2 0:06 4.59% sendmail > 1265 root 1 4 0 17196K 11824K select 3 0:02 4.59% rsync > 790 root 1 4 0 9940K 1260K select 1 0:06 4.49% authdaemon > 774 root 1 4 0 3604K 1220K select 2 0:06 4.49% couriertcp > 791 root 1 4 0 9940K 1260K select 0 0:06 4.49% authdaemon > > etc. > > ...and why are apcupsd (connected via serial port), syslogd, > couriertcpd, sendmail, etc. working a the _exact_ same time for the > same duration at around the same WPCU%? > > Just for comparison, this is a summary of top on FreeBSD 6.2 (32 bit) on > another non-deployed box running pretty much the same software (courier > imap, clamav, spamassassin, etc.) after rsync is activated: > 43.48% for one rsync process > 1.96% for another > 0.00% for everything else. > > On Tue, 5 Aug 2008 16:50:04 GMT > Kris Kennaway <kris@FreeBSD.org> wrote: > >> 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? >> > >
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