Date: Tue, 12 Jul 2005 09:21:13 +0300 From: Danny Braniss <danny@cs.huji.ac.il> To: freebsd-stable@freebsd.org Cc: freebsd-net@freebsd.org Subject: tcp troughput weirdness Message-ID: <E1DsE8n-0004CT-NQ@cs1.cs.huji.ac.il>
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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
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