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Date: Wed, 14 Dec 2011 06:06:43 -0500
From: George Mitchell <george+freebsd@m5p.com>
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To: Attilio Rao <attilio@freebsd.org>, freebsd-stable@freebsd.org
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Subject: Re: SCHED_ULE should not be the default
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On 12/09/11 19:57, George Mitchell wrote:
> On 12/09/11 10:17, Attilio Rao wrote:
>> [...]
>> More precisely I'd be interested in KTR traces.
>> To be even more precise:
>> With a completely stable GENERIC configuration (or otherwise please
>> post your kernel config) please add the following:
>> options KTR
>> options KTR_ENTRIES=262144
>> options KTR_COMPILE=(KTR_SCHED)
>> options KTR_MASK=(KTR_SCHED)
>>
>> While you are in the middle of the slow-down (so once it is well
>> established) please do:
>> # sysclt debug.ktr.cpumask=""
>
> wonderland# sysctl debug.ktr.cpumask=""
> debug.ktr.cpumask: ffffffffffffffff
> sysctl: debug.ktr.cpumask: Invalid argument
>
>>
>> In the end go with:
>> # ktrdump -ctf> ktr-ule-problem.out
>
> It's 44MB, so it's at http://www.m5p.com/~george/ktr-ule-problem.out

There have been 22 downloads of this file so far; does anyone who
looked at it have any results to report?

Dear Secret Masters of FreeBSD: Can we have a decision on whether to
change back to SCHED_4BSD while SCHED_ULE gets properly fixed?

-- George Mitchell

>
>>
>> and send the file to this mailing list.
>>
>> Thanks,
>> Attilio
>>
>>
>
> I hope this helps. -- George Mitchell