Date: Tue, 12 Jul 2005 09:57:52 +0300 From: Danny Braniss <danny@cs.huji.ac.il> To: Luigi Rizzo <rizzo@icir.org> Cc: freebsd-net@freebsd.org, freebsd-stable@freebsd.org Subject: Re: tcp troughput weirdness Message-ID: <E1DsEiG-0004x6-CJ@cs1.cs.huji.ac.il> In-Reply-To: Message from Luigi Rizzo <rizzo@icir.org> of "Mon, 11 Jul 2005 23:42:16 PDT." <20050711234216.A11017@xorpc.icir.org>
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> 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 > > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
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