Date: Sun, 7 Jun 2009 12:39:49 +0200 From: Attilio Rao <attilio@freebsd.org> To: Pierre Guinoiseau <geekounet@poildetroll.net> Cc: bf <bf2006a@yahoo.com>, "O. Hartmann" <ohartman@mail.zedat.fu-berlin.de>, freebsd-current@freebsd.org, Kip Macy <kmacy@freebsd.org> Subject: Re: signifanctly slowdown of FreeBSD 8.0-CURRENT/amd64 Message-ID: <3bbf2fe10906070339k663bace7qe5142702248ce6c9@mail.gmail.com> In-Reply-To: <4A2B3040.7020509@poildetroll.net> References: <951233.95131.qm@web39108.mail.mud.yahoo.com> <3c1674c90905302055g542cfadarf201cc273639977d@mail.gmail.com> <4A23919F.8050905@mail.zedat.fu-berlin.de> <4A2B3040.7020509@poildetroll.net>
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2009/6/7 Pierre Guinoiseau <geekounet@poildetroll.net>: > Hi, > > I have a similar problem, for about 3 weeks/1 month now, on a SMP box. > If i run something using much cpu for a "long" time and/or causing heavy > I/O, like compiling or watching a video, my box slows down a lot, X11 > (and any apps, X11 or not) become much less responsive, the CPU stays at > 100% load (mainly because of X11), even when the original task is ended. > If I stop X11, the system stay still very slow. The only way to get my > machine back in a usable state is to reboot it... :( Would you both be able to get a schedgraph trace of your offending workloads? In order to do that you would need to: - Recompile your kernel by just adding the following lines: options KTR options KTR_COMPILE=(KTR_SCHED) options KTR_ENTRIES=262144 options KTR_MASK=(KTR_SCHED) - Install the py-tkinter package from ports - While the new kernel is running the workload you are profiling do 'sysctl debug.ktr.mask=0' (it will disable, until restored the ability to trace, so in order to get more traces re-enable it) - Then do ktrdump -ct > ktr.out and send the output to lists, possibly specifying the frequency of your cores Thanks, Attilio -- Peace can only be achieved by understanding - A. Einstein
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