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