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From: Henry Wong <henry@cplabs.com>
Newsgroups: comp.unix.bsd.freebsd.misc,comp.unix.bsd.misc
Subject: 100Base-TX: where's the bottleneck?
Date: Sun, 03 Nov 1996 18:03:20 -0800
Organization: DASCOM HOLDING Ltd.
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Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:30546 comp.unix.bsd.misc:1423
Hi,everyone:
I wrote a simple code to test our fast ethernet performance,
but I didn't get the throughput I expected. The test evironment is
just two Pentium-133 with 3c905 Fast EtherLink XL PCI adapter and
3com 100Mb stackable hub on the network.
The code just setup socket between these two machine, allocate
a 4K buffer, send to 'echo' port (port 7) from one to another 1000
times, then read it back. There's no harddisk I/O stuff. I got the
time by call gettimeofday(), then I got the network throughput.
The problem is the speed is only 20Mb/s, it seems too low as
it is 100Mb network.Does anyone know where is the bottleneck? The
driver efficiency? Or the adapter's performace? Or I should add the
test clients to this network to get the better performance?
Also I checked the homepage about 100M ethernet performance:
http://www.uk.interop.com/bof/summary.html
But I still don't understand.
Any suggestions would be appreciated.
Thanks
Henry