Friday, September 02, 2005

Extremely poor network performance after OBP

Subject: Re: [SunHELP] Extremely poor network performance after OBP
upgrade(and os reinstal)

It may not be the Sun at all. If the other end is a Linux machine,
there is a bug in the e1000 driver in the 2.6 kernel distributed with
RHEL4.1 which causes nice Intel 1000 mbit cards to perform worse than 10
mbit cards in certain cases with tcp. Work around is here:

http://dsd.lbl.gov/TCP-tuning/linux.html

The difference is rather dramatic:

# ethtool -K eth1 tso on
# iperf -c 192.168.9.10
...
[ 3] 0.0-21.4 sec 4.77 MBytes 1.87 Mbits/sec

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