Re: Ubuntu network cards.

        We'll see how that iftab works later today (the man page seems to
confirm it as the thing to nuke). The next thing I'm curious about is
why Ubuntu appears to have some not-so-good TCP send performance on my
network here. Running Iperf from a Slackware 10.2 to Ubuntu 6.06 is this:
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-10.0 sec 281 MBytes 236 Mbits/sec

And reversing it, with the Ubuntu system sending to the Slackware
system, is this:
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.3 sec 88.5 MBytes 72.2 Mbits/sec

(The Slackware system has a 24mb CWND on receive, 64kb CWND on send;
Ubuntu has 85kb CWND on receive, 64kb CWND on send -- I've been tweaking
the sysctls for the networking a bit).

I'd say the 236 is a pretty good # considering I don't have jumbo frames
turned on (the Airlink switch I have doesn't appear to support it, so
don't buy Airlink if you want a real gigE switch), but the other number
is horrible -- worse than the old 100Mbps performance I had!
Received on Sun Aug 13 15:35:15 2006