re(4): puzzling netperf result

[Ruslan Ermilov]

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.
> 
> 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)
> 
> Running netperf -t UDP_STREAM on machine A with target B reports a
> throughput of ~200(!) Mbit/s.
> 
> How does the machine get the idea it is pushing 200 Mbit/s down a
> 100 Mbit/s link?
> 
Does ``netstat -I re0 -w 1'' show the same numbers while you're
running the UDP_STREAM test?


Cheers,
-- 
Ruslan Ermilov
ru at FreeBSD.org
FreeBSD committer
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