Date: Mon, 30 Jan 2012 16:10:07 -0500 From: Ryan Stone <rysto32@gmail.com> To: Attilio Rao <attilio@freebsd.org> Cc: Peter Holm <pho@freebsd.org>, Florian Smeets <flo@smeets.im>, freebsd-hackers@freebsd.org Subject: Re: Kernel threads inherit CPU affinity from random sibling Message-ID: <CAFMmRNyJQLSXTpYMMNOKM5vLbE0ZFuK6aEStXJXvWSewNReA%2BA@mail.gmail.com> In-Reply-To: <CAJ-FndD3366-uT191jMva3P-uL0DHi6nFeRfdsKA1hbJW7WqEA@mail.gmail.com> References: <CAFMmRNxF1uMOr39BbZkpPN=uM7G09dtcckAYw8ag6n6bi=FeOw@mail.gmail.com> <CAJ-FndDHsQRRNmrS7fsELEVohozWvvfaZ6eW_GipwHdjU9ZwxA@mail.gmail.com> <CAFMmRNyPkwx3hRtraq6QL64kibAeV3W23FE34T1oDnf9SVFOYg@mail.gmail.com> <CAJ-FndD3366-uT191jMva3P-uL0DHi6nFeRfdsKA1hbJW7WqEA@mail.gmail.com>
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On Sat, Jan 28, 2012 at 8:22 AM, Attilio Rao <attilio@freebsd.org> wrote: > Do you have a pathological test-case for it? Are you going to test the patch? > > Thanks, > Attilio I tested the patch last night. Previously I was able to see a softclock thread preempted for over 1ms on machine where 4/8 cores were lightly loaded. With this patch I can see that the softclock threads are free to migrate cores and they no longer see long scheduling latencies.
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