Date: Mon, 29 Sep 2008 10:56:32 +0300 From: Danny Braniss <danny@cs.huji.ac.il> To: Robert Watson <rwatson@FreeBSD.org> Cc: freebsd-hackers@freebsd.org, Jeremy Chadwick <koitsu@FreeBSD.org>, freebsd-stable@freebsd.org Subject: Re: bad NFS/UDP performance Message-ID: <E1KkDcO-000971-Co@cs1.cs.huji.ac.il> In-Reply-To: <E1KjY2h-0008GC-PP@cs1.cs.huji.ac.il> 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>
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> > On Fri, 26 Sep 2008, Danny Braniss wrote: > > > > > after more testing, it seems it's related to changes made between Aug 4 and > > > Aug 29 ie, a kernel built on Aug 4 works fine, Aug 29 is slow. I'l now try > > > and close the gap. > > > > I think this is the best way forward -- skimming August changes, there are a > > number of candidate commits, including retuning of UDP hashes by mav, my > > rwlock changes, changes to mbuf chain handling, etc. > > it more difficult than I expected. > for one, the kernel date was missleading, the actual source update is the key, so > the window of changes is now 28/July to 19/August. I have the diffs, but nothing > yet seems relevant. > > on the other hand, I tried NFS/TCP, and there things seem ok, ie the 'good' and the 'bad' > give the same throughput, which seem to point to UDP changes ... > > danny Grr, there goes binary search theory out of the window, So far I have managed to pinpoint the day that the changes affect the throughput: 18/08/08 00:00:00 19/08/08 00:00:00 (I assume cvs's date is GMT). now would be a good time for some help, specially how to undo changes, my knowledge of csup/cvs are close to zero. danny
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