Re: Strange load average and ksoftirqd behavior with2.6.29-rc2-git1

From: Damien Wyart
Date: Tue Jan 27 2009 - 11:15:22 EST


Just a heads up on this problem I sent a few days ago:

> Testing 2.6.29-rc2-git1, I notice something which doesn't happen with
> on the same machine with the same config (minus new config
> entries for 2.6.29) : when the machine is idle, the load average
> reported by top is not 0.00 (it is with but between 0.30 and
> 0.80 and either ksoftirqd/0 or ksoftirqd/1 is listed as number one in
> top output, with a few % of CPU. The machine seems to work fine but
> I think something is still wrong.

> Here is an example of top output :

> top - 17:23:40 up 19 min, 2 users, load average: 0.42, 0.48, 0.34
> Tasks: 99 total, 1 running, 98 sleeping, 0 stopped, 0 zombie
> Cpu(s): 0.2%us, 0.5%sy, 0.0%ni, 99.1%id, 0.0%wa, 0.0%hi, 0.2%si, 0.0%st
> Mem: 2075420k total, 311920k used, 1763500k free, 4912k buffers
> Swap: 1212896k total, 0k used, 1212896k free, 115648k cached

> 4 root 15 -5 0 0 0 S 1 0.0 0:30.74 ksoftirqd/0
> 1 root 20 0 2100 692 588 S 0 0.0 0:00.47 init

> I attach dmesg, config and /proc/interrupts. Feel free to ask more info
> if needed.

The problem is still present in 2.6.29-rc2-git3 on this P4 machine, but
I do not see it on a Centrino laptop.

Config has not changed and I do not know if /proc/interrupts is useful
or not so I am not attaching anything for now, feel free to ask for more
information and I will do my best to provide it. I know someone else
also experienced this problem on his machines.

Damien Wyart
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