Re: tcp bw in 2.6

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From: David Miller
Date: Tuesday, October 2, 2007 - 2:16 pm

From: lm@bitmover.com (Larry McVoy)
Date: Tue, 2 Oct 2007 09:48:58 -0700


Nobody is really doing this, or they aren't talking about it.
Sometimes the crash fixes and other work completely consumes us.  Add
in travel to conferences and real life, and it's no surprise stuff
like this slips through the cracks.

We absolutely depend upon people like you to report when there are
anomalies like this.  It's the only thing that scales.

FWIW I have a t1000 Niagara box and an Ultra45 going through a netgear
gigabit switch.  I'm getting 85MB/sec in one direction and 10MB/sec in
the other (using bw_tcp from lmbench3).  Both are using identical
broadcom tigon3 gigabit chips and identical current kernels so that is
a truly strange result.

I'll investigate, it may be the same thing you're seeing.
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Messages in current thread:
Re: tcp bw in 2.6, Larry McVoy, (Mon Oct 1, 5:59 pm)
Re: tcp bw in 2.6, Linus Torvalds, (Mon Oct 1, 7:14 pm)
Re: tcp bw in 2.6, Larry McVoy, (Mon Oct 1, 7:20 pm)
Re: tcp bw in 2.6, David Miller, (Mon Oct 1, 8:50 pm)
Re: tcp bw in 2.6, Larry McVoy, (Mon Oct 1, 9:23 pm)
Re: tcp bw in 2.6, Herbert Xu, (Tue Oct 2, 3:52 am)
Re: tcp bw in 2.6, John Heffner, (Tue Oct 2, 8:06 am)
Re: tcp bw in 2.6, Larry McVoy, (Tue Oct 2, 8:09 am)
Re: tcp bw in 2.6, Larry McVoy, (Tue Oct 2, 8:41 am)
Re: tcp bw in 2.6, Larry McVoy, (Tue Oct 2, 9:25 am)
Re: tcp bw in 2.6, Linus Torvalds, (Tue Oct 2, 9:34 am)
Re: tcp bw in 2.6, Stephen Hemminger, (Tue Oct 2, 9:47 am)
Re: tcp bw in 2.6, Ben Greear, (Tue Oct 2, 9:48 am)
Re: tcp bw in 2.6, Larry McVoy, (Tue Oct 2, 9:48 am)
Re: tcp bw in 2.6, Larry McVoy, (Tue Oct 2, 9:49 am)
Re: tcp bw in 2.6, Stephen Hemminger, (Tue Oct 2, 10:10 am)
Re: tcp bw in 2.6, Larry McVoy, (Tue Oct 2, 10:11 am)
Re: tcp bw in 2.6, Rick Jones, (Tue Oct 2, 10:14 am)
Re: tcp bw in 2.6, Ben Greear, (Tue Oct 2, 10:18 am)
Re: tcp bw in 2.6, Larry McVoy, (Tue Oct 2, 10:20 am)
Re: tcp bw in 2.6, Larry McVoy, (Tue Oct 2, 10:21 am)
Re: tcp bw in 2.6, Stephen Hemminger, (Tue Oct 2, 10:54 am)
Re: tcp bw in 2.6, Rick Jones, (Tue Oct 2, 11:01 am)
Re: tcp bw in 2.6, John Heffner, (Tue Oct 2, 11:29 am)
Re: tcp bw in 2.6, Larry McVoy, (Tue Oct 2, 11:35 am)
Re: tcp bw in 2.6, Larry McVoy, (Tue Oct 2, 11:40 am)
Re: tcp bw in 2.6, Larry McVoy, (Tue Oct 2, 12:07 pm)
Re: tcp bw in 2.6, Linus Torvalds, (Tue Oct 2, 12:27 pm)
Re: tcp bw in 2.6, Linus Torvalds, (Tue Oct 2, 12:29 pm)
Re: tcp bw in 2.6, Larry McVoy, (Tue Oct 2, 12:33 pm)
Re: tcp bw in 2.6, Rick Jones, (Tue Oct 2, 12:47 pm)
Re: tcp bw in 2.6, Rick Jones, (Tue Oct 2, 12:53 pm)
Re: tcp bw in 2.6, John Heffner, (Tue Oct 2, 12:53 pm)
Re: tcp bw in 2.6, Larry McVoy, (Tue Oct 2, 1:14 pm)
Re: tcp bw in 2.6, David Miller, (Tue Oct 2, 1:31 pm)
Re: tcp bw in 2.6, David Miller, (Tue Oct 2, 1:33 pm)
Re: tcp bw in 2.6, Rick Jones, (Tue Oct 2, 1:40 pm)
Re: tcp bw in 2.6, Wayne Scott, (Tue Oct 2, 1:42 pm)
Re: tcp bw in 2.6, Roland Dreier, (Tue Oct 2, 1:44 pm)
Re: tcp bw in 2.6, David Miller, (Tue Oct 2, 2:16 pm)
Re: tcp bw in 2.6, Larry McVoy, (Tue Oct 2, 2:21 pm)
Re: tcp bw in 2.6, Larry McVoy, (Tue Oct 2, 2:26 pm)
Re: tcp bw in 2.6, David Miller, (Tue Oct 2, 2:32 pm)
Re: tcp bw in 2.6, David Miller, (Tue Oct 2, 2:47 pm)
Re: tcp bw in 2.6, Linus Torvalds, (Tue Oct 2, 2:56 pm)
Re: tcp bw in 2.6, Rick Jones, (Tue Oct 2, 3:17 pm)
Re: tcp bw in 2.6, David Miller, (Tue Oct 2, 3:32 pm)
Re: tcp bw in 2.6, Larry McVoy, (Tue Oct 2, 3:36 pm)
Re: tcp bw in 2.6, Rick Jones, (Tue Oct 2, 3:59 pm)
Re: tcp bw in 2.6, Bill Fink, (Wed Oct 3, 12:19 am)
Re: tcp bw in 2.6, David Miller, (Wed Oct 3, 1:02 am)
Re: tcp bw in 2.6, Pekka Pietikainen, (Wed Oct 3, 2:13 pm)
Re: tcp bw in 2.6, Larry McVoy, (Wed Oct 3, 2:23 pm)
Re: tcp bw in 2.6, Pekka Pietikainen, (Wed Oct 3, 2:50 pm)
Re: tcp bw in 2.6, Daniel Schaffrath, (Mon Oct 15, 5:40 am)
Re: tcp bw in 2.6, Stephen Hemminger, (Mon Oct 15, 8:49 am)