Date: Mon, 13 Dec 2004 16:48:35 -0500 (EST) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Andre Oppermann <andre@freebsd.org> Cc: freebsd-net@freebsd.org Subject: Re: Rewritten TCP reassembly Message-ID: <16830.3635.392271.923345@grasshopper.cs.duke.edu> In-Reply-To: <41BE0ADA.9A1EE748@freebsd.org> References: <41BA0088.9000107@freebsd.org> <41BDD1C7.7060105@freebsd.org> <16830.1004.797220.47672@grasshopper.cs.duke.edu> <41BE0ADA.9A1EE748@freebsd.org>
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Andre Oppermann writes: > > I have already the next round in the works which is optimized even more > by merging consecutive mbuf chains together (at the moment I have packet > segment chains which have a direct pointer to the mbuf at the end of the > chain) and which get passed in one go to soappend_stream. This removes > the "present" loop and simplifies the general code a bit more again. Great.. I've been a little busy, and have only run tests -- I haven't even looked at the code ;) > With this and two other optimizations I have in mind you should be able > to get very close to the theoretical maximum bandwidth of your current > 4Gig Myrinet cards. > > There are a couple of other TCP tweaks that would help your special case > some more now though. FWIW, the out-of-order frames are a firmware bug that we hope to fix soon. Its just icing on the cake that the bug makes such a nice test case for you ;) With no copy overhead (kttcp), 3.95Gb/sec is easily achievable, even in 5-stable with the old TCP reassembly code. Drew
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