Date: Thu, 22 Dec 2011 21:01:15 +0200 From: Andriy Gapon <avg@FreeBSD.org> To: Steve Kargl <sgk@troutmask.apl.washington.edu> Cc: freebsd-stable@FreeBSD.org Subject: Re: SCHED_ULE should not be the default Message-ID: <4EF37E7B.4020505@FreeBSD.org> In-Reply-To: <20111222184531.GA36084@troutmask.apl.washington.edu> References: <4EE1EAFE.3070408@m5p.com> <CAJ-FndBSOS3hKYqmPnVkoMhPmowBBqy9-%2BeJJEMTdoVjdMTEdw@mail.gmail.com> <20111215215554.GA87606@troutmask.apl.washington.edu> <CAJ-FndD0vFWUnRPxz6CTR5JBaEaY3gh9y7-Dy6Gds69_aRgfpg@mail.gmail.com> <20111222005250.GA23115@troutmask.apl.washington.edu> <20111222103145.GA42457@onelab2.iet.unipi.it> <20111222184531.GA36084@troutmask.apl.washington.edu>
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on 22/12/2011 20:45 Steve Kargl said the following: > I've used schedgraph to look at the ktrdump output. A jpg is > available at http://troutmask.apl.washington.edu/~kargl/freebsd/ktr.jpg > This shows the ping-pong effect where here 3 processes appear to be > using 2 cpus while the remaining 2 processes are pinned to their > cpus. I'd recommended enabling CPU-specific background colors via the menu in schedgraph for a better illustration of your findings. NB: I still don't understand the point of purposefully running N+1 CPU-bound processes. -- Andriy Gapon
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