Date: Tue, 23 Sep 2008 14:44:36 -0400 From: Mikhail Teterin <mi+mill@aldan.algebra.com> To: "Paul B. Mahol" <onemda@gmail.com> Cc: stable@freebsd.org Subject: Re: 7.0-stable: a hung process - scheduler bug? Message-ID: <48D93914.3020502@aldan.algebra.com> In-Reply-To: <3a142e750809231125o579445baufb5f2676e4d9a2ca@mail.gmail.com> References: <48D92589.8000200@aldan.algebra.com> <3a142e750809231125o579445baufb5f2676e4d9a2ca@mail.gmail.com>
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Paul B. Mahol ΞΑΠΙΣΑΧ(ΜΑ):
>> Let me know, what else I can do to help fix this bug -- I'm going to
>> reboot the machine tonight... Should I switch to SCHED_ULE as a
>> work-around?
>>
>
> SCHED_BSD4 is suboptimal for 4 CPUs, and it is replaced with SCHED_ULE
> on 7 STABLE.
>
Thanks, Paul for the explanation. I've heard of some problems still
lingering in the ULE and figured, I'll stay with the BSD-scheduler for a
while. I guess, it is time to switch.
However, what I'm seeing on my system today is evidence of the scheduler
having a bug, rather than merely being suboptimal. If the old scheduler
is still maintained and supposed to work (however sub-optimally) in
4-CPU configurations, I'd expect either inquiries for more
debug-information or assurances, that the bug is known and worked on.
In the July 26th sys/conf/NOTES file the SCHED_BSD4 is still on the
default option....
Yours,
-mi
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