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Message-ID: <470ECE0F.4060506@candelatech.com> Date: Thu, 11 Oct 2007 18:29:51 -0700 From: Ben Greear <greearb@...delatech.com> To: John Heffner <jheffner@....edu> CC: netdev@...r.kernel.org Subject: Re: Question on TSO maximum segment sizes. John Heffner wrote: > Ben Greear wrote: >> I just tried turning off my explicit SO_SNDBUF/SO_RCVBUG settings in >> my app, >> and the connection ran very poorly through a link with even a small >> bit of latency (~2-4ms I believe). > > I often run at full gigabit or faster with latencies of 100+ ms. Can > you give a bit more detail? I'm doing non-blocking TCP sends, write sizes of around 64k, and I'm doing this to/from the same system with the send-to-self patch. I am running full-duplex (930+Mbps tx + rx on both ports) (this is about 980Mbps on the wire). If I don't set the tx-queue % rx-queue sizes large (~4MB), it does not perform well when running through my latency emulator. If I do set them, then it runs just fine (barring an occassional TCP throughput deadlock & ACK storm that is being worked on separately.) If it works for other people, then it could be something else weird about my setup. I have an easy work-around (been in the code for years and years now), so I'm not too worried either way. Thanks, Ben > > -John -- Ben Greear <greearb@...delatech.com> Candela Technologies Inc http://www.candelatech.com - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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