Re: 2.6.0test9 + 2 * P IV Xeon 2.4GHz with HT + SATA + RAID1 = schedulerproblems

[Nick Piggin]

Catalin BOIE wrote:

> Hi!
>
> I want to tell you that 2.6.0-test gets better and better. It works very
> very well on several systems. Thank you very much, guys.
>
> I have an server (like in the subject). The problem is that the scheduler
> seems to behave weird. Sometimes a program just do nothing. There is no
> disk activity, interrupts are a little over 1000, no disk requests,
> context switches are ~40. The system is idle but it has work to do!
> Can I provide more info?
>
> I tried to put elevator=deadline and things seems worse.
>
> If I'm not mistaken, the processes are in D state. Bt I'm not sure, I must
> check again and right now I can't.

Hi,
Please capture a Ctrl + Scroll Lock dump when you get processes stuck in
D state.

> Also I suspect that scheduler doesn't pay special attention to virtual
> (HT) processors. Is this true?

This is correct. Are you seeing any problems with HT? I think Linus
was hoping the NUMA / SMP scheduler could be generalised a bit more
so that HT would just fall into place. This might not happen before
2.7, so the shared runqueue approach might be the next best thing
(I like it).


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