Messages in this thread | | | Date | Thu, 13 Nov 2003 22:42:16 +1100 | From | Nick Piggin <> | Subject | Re: 2.6.0test9 + 2 * P IV Xeon 2.4GHz with HT + SATA + RAID1 = scheduler problems |
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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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