Re: [stable] 2.6.23 regression: top displaying 9999% CPU usage

Balbir Singh
2007-10-16T10:39:27Z

Frans Pop wrote:
> On Tuesday 16 October 2007, Balbir Singh wrote:
>> I am trying to think out loud as to what the root cause of the problem
>> might be. In one of the discussion threads, I saw utime going backwards,
>> which seemed very odd, I suspect that those are rounding errors.
>
> I only remembered stime going backwards, but looking back at the mails
> you are right, there has been one case of utime going backwards too.
> stime going backwards happens _much_ more frequently.
>
>> I have tried and not had any success reproducing the problem, could you
>> please help me with some pointers/steps to reproduce the problem?
>
> I can reproduce the problem reliably for two KDE programs I have running
> permanently on my system: kontact and amarok. Both of these wake up
> regularly and use some (not very much) processor capacity before going to
> sleep again. Any process that has that that characteristic should do.
>
> /me thinks a bit and tries something
>
> lol - I have just managed to reproduce this with 'top' itself :-P
>

Thanks, I know why I am not seeing the problem. My box has
CONFIG_VIRT_CPU_ACCOUNTING set. I'll find another box and try.

--
Warm Regards,
Balbir Singh
Linux Technology Center
IBM, ISTL