netdev - Re: tcp bw in 2.6

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Message-Id: <20071002.164223.59654826.wscott@bitmover.com>
Date:	Tue, 02 Oct 2007 16:42:23 -0400 (EDT)
From:	Wayne Scott <wscott@...mover.com>
To:	lm@...mover.com
Cc:	jheffner@....edu, herbert@...dor.apana.org.au,
	torvalds@...ux-foundation.org, davem@...emloft.net,
	netdev@...r.kernel.org
Subject: Re: tcp bw in 2.6

From: lm@...mover.com (Larry McVoy)
> Wayne, Linus asked for tcp dumps from just one side, with the first 100
> packets and then wait 10 seconds or so for the window to open up, and then
> a snap shot of the another 100 packets.  Do that for both directions
> and send them to the list.  Can you do that?  I want to get lunch, I'm
> starving.

OK attached are 4 raw tcpdumps of 1000 packets each.  One from the
start and one from steady state.

The slow set was done like this:

 on ia64:  netcat -l -p8888 > /dev/null
 on work:  netcat ia64 8888 < /dev/zero

 the traces were done of work with slow1 started right before the
 netcat on work was exectued.  And slow2 started after it acheved
 steady state at 18MB/s.

The fast set was done like this:

 on work:  netcat -l -p8888 > /dev/null
 on ia64:  netcat ia64 8888 < /dev/zero

 the traces were done of work with fast1 started right before the
 netcat on ia64 was exectued.  And fast2 started after it acheved
 steady state at 42MB/s.

-Wayne

Download attachment "tcpdumps.lm.bz2" of type "Application/Octet-Stream" (60715 bytes)