Date: Mon, 12 Oct 2009 01:20:48 +0200 From: Attilio Rao <attilio@freebsd.org> To: Larry Rosenman <ler@lerctr.org> Cc: freebsd-current@freebsd.org Subject: Re: Scheduler weirdness Message-ID: <3bbf2fe10910111620p3aa5d4cbgb5db2659d8477142@mail.gmail.com> In-Reply-To: <100658409950385d656fb5d8030af744.squirrel@webmail.lerctr.org> References: <6729ad0409e449f8dbda69ecd8feb618.squirrel@webmail.lerctr.org> <3bbf2fe10910111611p2f48d89cpa80350980f4f03e4@mail.gmail.com> <100658409950385d656fb5d8030af744.squirrel@webmail.lerctr.org>
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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 Thanks, Attilio -- Peace can only be achieved by understanding - A. Einstein
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