Re: tcp troughput weirdness

From: Danny Braniss (danny_at_cs.huji.ac.il)
Date: 07/12/05

  • Next message: Mile: "(no subject)" 
    To: David Malone <dwmalone@maths.tcd.ie>
Date: Tue, 12 Jul 2005 12:21:23 +0300

    > > > Are the window sizes on Linux bigger or smaller?
    >
    > > TCP window size: 16.0 KByte (default)
    > > smaller :-(, but increasing it does not make any change
    >
    > Hmmm... Various things that you could try (I'd try them
    > one by on, rather than all together):
    >
    > 1) sysctl net.inet.tcp.inflight_enable=0
    >
    > 2) sysctl net.inet.tcp.sendspace=131072
    > sysctl net.inet.tcp.recvspace=131072
    >
    > 3) sysctl net.inet.tcp.sack.enable=0

    >
    > I'd be interested to know if any of them make much difference.

    combining
            sysctl net.inet.tcp.sendspace=131072
    and
            sysctl net.inet.tcp.inflight.enable=0

    did the trick! now can someone remind me what inflight does? and could
    someone explain why increasing sendspace alone did not do the trick?
    (i had it at 64k, which got things better, but not sufficient).

    thanks!
    >
    > David.

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