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

[Catalin BOIE]

> Hi,
Hi!

> Please capture a Ctrl + Scroll Lock dump when you get processes stuck in
> D state.
I will.

> >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

Do you think that disabling HT (how I do it? noht?) will make things works
better? I suspect that a process is scheduled on a virtual processor that
doesn't get much chances to execute something. I don't know.

> 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).

The problem with HT is the one that I describe here. From time to time a
process (mc, bash) is stuck for 2-6 seconds and then comes back. In test8
this was more visible.

Thank you very much, Nick!

---
Catalin(ux) BOIE
catab@xxxxxxxxxxxxxxx
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