Messages in this thread | | | Date | Mon, 4 Aug 2008 22:37:30 +0200 | From | "Dushan Tcholich" <> | Subject | Re: ksoftirqd high cpu load on kernels 2.6.24 to 2.6.27-rc1-mm1 |
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Hello
On Mon, Aug 4, 2008 at 9:43 PM, Robert Hancock <hancockr@shaw.ca> wrote: > Dushan Tcholich wrote: >> >> Hello >> >> This is my first bugreport on LKML so please be patient :) >> >> top always shows me that ksoftirqd usualy gets around 8%CPU, it >> changes between 6 and 10%. >> It's sometimes ksoftirqd/0 sometimes /1, differs on the reboot but >> doesn't change during work. >> I noticed it because it had very high time+, 500hours or so. >> I reproduced these problems with kernels 2.6.24 .25 and .27-rc1-mm1. I >> don't remember that this happened during .22 and .23 kernels, but I >> can check again if it's necessary. >> Timer freq is 1000Hz >> >> What I tried without changes with help from ##kernel: >> 1. built kernel without kvm; >> 2. disconnected all usb hw except mouse; >> 3. run glxgears which consumed 98% CPU and ksoftirqd 2%; >> 4. Tried to stress disk subsystem by copying a lot of small files on >> the same partition: >> time cp -R /usr/portage/* /tmp/1 >> real 2m17.530s >> user 0m0.764s >> sys 0m18.596s >> >> it was 127507 items 1.5GB, but just pdflush jumped to 14% from time to >> time; >> 5. disabled serial port in BIOS because my UPS was connected to it, >> and I suspected that it was maybe polling too much; >> 6. disconnected eth cable >> 7. tried googling but all I found is that some people had similar >> problem. Some TV cards were the culprit but I don't have that HW. >> >> If you need any more data please cc me as I'm not subscribed > > It would be useful to try running oprofile on an otherwise idle system and > see where it reports the CPU time is being used.. > I googled a little and found out that oprofile is a little above my head. So as I thought that some driver or HW might be responsible for this I tried to disable various onboard HW and found out that if I disable onboard ethernet problem dissapears, so now I've added netdev and maintainer of R8169 driver to cc.
Thanks Dushan
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