Re: tcp troughput weirdness

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

  • Next message: Danny Braniss: "Re: tcp troughput weirdness" 
    To: Luigi Rizzo <rizzo@icir.org>
Date: Tue, 12 Jul 2005 09:57:52 +0300

    > we need more data points -
    > did you test tcp or udp ?
    i used iperf:
            Client connecting to x-dev, TCP port 5001
            TCP window size: 65.0 KByte (WARNING: requested 64.0 KByte)

    > who is sourcing data ?
    all, I tried all combinations, and the numbers are very similar to the
    ones i posted.

    > are the bandwidth symmetric (i.e. A-> same as B -> A ?
    yes, theys are all in the same floor, fisical distance is a few meters.
    i also tried other similar boxes and the freebsd thoughput is very similar,
    so i doubt it that switches or hardware is involved.

    > cheers
    > luigi

    thanks,
            danny

    >
    > On Tue, Jul 12, 2005 at 09:21:13AM +0300, Danny Braniss wrote:
    > > while checking out the quality of a switch, I came about a very disturbing
    > > dicovery: FreeBSD <-> Linux througput is MUCH better than FreeBSD <-> FreeBSD
    > >
    > > Setup:
    > > 2 blades in the same bladeserver, A running FreeBSD 5.4, B running Linux
    > > C is running FreeBSD 5.4
    > > all are connected at 1gb.
    > >
    > > A -+ (FreeBSD)
    > > |
    > > B -+ (Linux)
    > > |
    > > [switch]
    > > |
    > > +---- [router] --- C (FreeBSD)
    > > A & B are on the same Vlan.
    > >
    > > iperf results:
    > > Interval Transfer Bandwidth
    > >
    > > A <=> B 0.0-10.0 sec 1.09 GBytes 939 Mbits/sec
    > >
    > > A <=> C 0.0-10.0 sec 515 MBytes 432 Mbits/sec
    > >
    > > B <=> C 0.0-10.0 sec 1.07 GBytes 918 Mbits/sec
    > >
    > > I've run the tests several times, and the numbers are very similar,
    > > so BIG Question: is there anything that can be tunned on the FreeBSD to
    > > better the throughput?
    > >
    > > danny
    > >
    > >
    > >
    > > _______________________________________________
    > > freebsd-net@freebsd.org mailing list
    > > http://lists.freebsd.org/mailman/listinfo/freebsd-net
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