Date: Fri, 03 Oct 2008 16:26:53 +0300 From: Danny Braniss <danny@cs.huji.ac.il> To: Robert Watson <rwatson@FreeBSD.org> Cc: freebsd-hackers@freebsd.org, freebsd-stable@freebsd.org Subject: Re: bad NFS/UDP performance Message-ID: <E1KlkgH-000Iv9-2A@cs1.cs.huji.ac.il> In-Reply-To: <alpine.BSF.1.10.0810031022140.41647@fledge.watson.org> References: <E1Kj7NA-000FXz-3F@cs1.cs.huji.ac.il> <20080926081806.GA19055@icarus.home.lan> <E1Kj9bR-000H7t-0g@cs1.cs.huji.ac.il> <20080926095230.GA20789@icarus.home.lan> <E1KjEZw-000KkH-GP@cs1.cs.huji.ac.il> <alpine.BSF.1.10.0809271114450.20117@fledge.watson.org> <E1KjY2h-0008GC-PP@cs1.cs.huji.ac.il> <b41c75520809290140i435a5f6dge5219cd03cad55fe@mail.gmail.com> <E1Klfac-000DzZ-Ie@cs1.cs.huji.ac.il> <alpine.BSF.1.10.0810030910351.41647@fledge.watson.org> <E1KlgYe-000Es2-8u@cs1.cs.huji.ac.il> <alpine.BSF.1.10.0810031003440.41647@fledge.watson.org> <E1KlgnA-000F6w-NT@cs1.cs.huji.ac.il> <alpine.BSF.1.10.0810031022140.41647@fledge.watson.org>
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> > On Fri, 3 Oct 2008, Danny Braniss wrote: > > > gladly, but have no idea how to do LOCK_PROFILING, so some pointers would be > > helpfull. > > The LOCK_PROFILING(9) man page isn't a bad starting point -- I find that the > defaults work fine most of the time, so just use them. Turn the enable syscl > on just before you begin a run, and turn it off immediately afterwards. Make > sure to reset between reruns (rebooting to a new kernel is fine too!). > in ftp://ftp.cs.huji.ac.il/users/danny/lock.prof there 3 files: 7.1-100 host connected at 100 running -prerelease 7.1-1000 same but connected at 1000 7.0-1000 -stable with your 'patch' at 100 my benchmark didn't suffer from the profiling, average was about 9. at 1000 the benchmark got realy hit, average was around 12 for the patched, and 4 for the unpatched (less than at 100). danny
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