Date: Sun, 11 Oct 2009 20:43:28 -0500 From: "Larry Rosenman" <ler@lerctr.org> To: freebsd-current@freebsd.org Subject: Re: Scheduler weirdness Message-ID: <6495ee63c0e2b33aded5d63decbaff02.squirrel@webmail.lerctr.org> In-Reply-To: <3bbf2fe10910111620p3aa5d4cbgb5db2659d8477142@mail.gmail.com> References: <6729ad0409e449f8dbda69ecd8feb618.squirrel@webmail.lerctr.org> <3bbf2fe10910111611p2f48d89cpa80350980f4f03e4@mail.gmail.com> <100658409950385d656fb5d8030af744.squirrel@webmail.lerctr.org> <3bbf2fe10910111620p3aa5d4cbgb5db2659d8477142@mail.gmail.com>
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On Sun, October 11, 2009 6:20 pm, Attilio Rao wrote: > 2009/10/12 Larry Rosenman <ler@lerctr.org>: >> >> On Sun, October 11, 2009 6:11 pm, Attilio Rao wrote: >>> 2009/10/12 Larry Rosenman <ler@lerctr.org>: >>>> >>>> Ok, running RELENG_8 from Friday (10/9/2009). >>>> >>>> If I have 4 Folding-at-home processes running (they nice themselves) >>>> the >>>> system is slow as a dog. >>>> >>>> If I stop them, it's speedy. >>>> >>>> This is running SCHED_ULE >>>> >>>> is this expected? >>>> >>>> What can I do to help? >>> >>> Can you please produce the schedgraph output for this workload? >>> Do you know how to setup it? >> >> I'm not familiar with this. What do I need to do? > > - Recompile your kernel with the following options: > KTR > KTR_COMPILE=(KTR_SCHED) > KTR_MASK=(KTR_SCHED) > KTR_ENTRIES=262144 > > - Run the buggy workload > - When the slowness has been experienced a bit (a reasonable timeframe > is within 10/20 secs) do: sysctl debug.ktr.mask=0 > - do: ktrdump -ct > ktr.out > - send here this file along with the number and frequency of your CPUs Sent under separate cover direct to Attilio. Thanks, Attilio! > > Thanks, > Attilio > > > -- > Peace can only be achieved by understanding - A. Einstein > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org" > -- Larry Rosenman http://www.lerctr.org/~ler Phone: +1 512-248-2683 E-Mail: ler@lerctr.org US Mail: 430 Valona Loop, Round Rock, TX 78681-3893
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