From owner-freebsd-net@FreeBSD.ORG  Mon Apr 12 07:42:38 2004
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Date: Mon, 12 Apr 2004 17:42:21 +0300
From: Ruslan Ermilov <ru@FreeBSD.org>
To: Christian Weisgerber <naddy@mips.inka.de>
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cc: freebsd-net@FreeBSD.org
Subject: Re: re(4): puzzling netperf result
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On Mon, Apr 12, 2004 at 02:33:39PM +0000, Christian Weisgerber wrote:
> I just did some quick and dirty checks with netperf and noticed a
> somewhat surprising result.
>=20
> Machine A: Alpha PC164, FreeBSD 5.2-CURRENT, re(4), 1000Base-T
> Machine B: Alpha PC164SX, OpenBSD 3.5, de(4), 100Base-TX
> Switch:    StarChip SGS-1008 (10/100/1000Base-T)
>=20
> Running netperf -t UDP_STREAM on machine A with target B reports a
> throughput of ~200(!) Mbit/s.
>=20
> How does the machine get the idea it is pushing 200 Mbit/s down a
> 100 Mbit/s link?
>=20
Does ``netstat -I re0 -w 1'' show the same numbers while you're
running the UDP_STREAM test?


Cheers,
--=20
Ruslan Ermilov
ru@FreeBSD.org
FreeBSD committer

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