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Old 02-13-06, 08:28 PM   #1
gonwin
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Join Date: Feb 2006
Posts: 1
Post Soft interrupts increase CPU usage to 40-60% on idle machine

This problem happens every day and lasts for hours (8 or more) but if I
leave the machine running overnight the problems has gone away in the
morning only to return sometime later.

rimu:~$ mpstat 5 1
Linux 2.6.12-10-k7 (rimu) 12/02/06

15:43:30 CPU %user %nice %sys %iowait %irq %soft %idle intr/s
15:43:35 all 0.40 0.00 0.40 0.00 0.00 53.69 45.51 24415.97
Average: all 0.40 0.00 0.40 0.00 0.00 53.69 45.51 24415.97

If I change to another Virtual Terminal the soft-interrupts go away but
immediately come back if switch back to X. Even if I reboot the problem
still persists including booting to single user mode and only starting
the "X" command.

If I start any opengl application the problem goes away for about 15
seconds then quickly ramps up to the 40-80%:

rimu:~$ mpstat 5 1;glxinfo >/dev/null;mpstat 5 5
Linux 2.6.12-10-k7 (rimu) 12/02/06

15:51:26 CPU %user %nice %sys %iowait %irq %soft %idle intr/s
15:51:31 all 0.60 0.00 0.40 0.00 0.00 54.00 45.00 25279.60
Average: all 0.60 0.00 0.40 0.00 0.00 54.00 45.00 25279.60
Linux 2.6.12-10-k7 (rimu) 12/02/06

15:51:31 CPU %user %nice %sys %iowait %irq %soft %idle intr/s
15:51:36 all 0.80 0.00 0.00 0.00 0.00 0.60 98.60 1271.74
15:51:41 all 0.80 0.00 0.40 0.00 0.00 0.60 98.20 1263.47
15:51:46 all 0.80 0.00 0.20 0.00 0.00 0.40 98.60 1257.60
15:51:51 all 1.40 0.00 0.40 0.00 0.00 10.22 87.98 3586.77
15:51:56 all 1.79 0.00 1.20 0.00 0.00 78.09 18.92 28944.0


I can suppress the problem by running the following script:

while [ 1 ];do glxinfo >/dev/null;sleep 15;done

Having a opengl application constantly running does not fix the problem
only *starting* an application does.


I have tried different kernels such as ubuntu 2.6.12-10-386 along with
the ubuntu package nvidia drivers but all exhibit the same behaviour.
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