From: lm@bitmover•com (Larry McVoy)
To: David Miller <davem@davemloft•net>
Cc: lm@bitmover•com, torvalds@linux-foundation•org,
herbert@gondor•apana.org.au, wscott@bitmover•com,
netdev@vger•kernel.org
Subject: Re: tcp bw in 2.6
Date: Tue, 2 Oct 2007 14:26:08 -0700 [thread overview]
Message-ID: <20071002212608.GG29944@bitmover.com> (raw)
In-Reply-To: <20071002.141656.42880006.davem@davemloft.net>
On Tue, Oct 02, 2007 at 02:16:56PM -0700, David Miller wrote:
> We absolutely depend upon people like you to report when there are
> anomalies like this. It's the only thing that scales.
Well cool, finally doing something useful :)
Is this issue no test setup? Because this does seem like something we'd
want to have work well.
> 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).
Note that bw_tcp mucks with SND/RCVBUF. It probably shouldn't, it's been
12 years since that code went in there and I dunno if it is still needed.
> 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.
Wow, sounds very similar. In my case I was seeing pretty close to 3x
consistently. You're more like 8x, but I was all e1000 not broadcom.
And note that sky2 doesn't have this problem. Does the broadcom do TSO?
And sky2 not? I noticed a much higher CPU load for sky2.
--
---
Larry McVoy lm at bitmover.com http://www.bitkeeper.com
next prev parent reply other threads:[~2007-10-02 21:26 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20070929142517.EC6AB5FB21@work.bitmover.com>
[not found] ` <alpine.LFD.0.999.0709290914410.3579@woody.linux-foundation.org>
[not found] ` <20070929172639.GB7037@bitmover.com>
[not found] ` <alpine.LFD.0.999.0709291050200.3579@woody.linux-foundation.org>
2007-10-02 0:59 ` tcp bw in 2.6 Larry McVoy
2007-10-02 2:14 ` Linus Torvalds
2007-10-02 2:20 ` Larry McVoy
2007-10-02 3:50 ` David Miller
2007-10-02 4:23 ` Larry McVoy
2007-10-02 15:06 ` John Heffner
2007-10-02 17:14 ` Rick Jones
2007-10-02 17:20 ` Larry McVoy
2007-10-02 18:01 ` Rick Jones
2007-10-02 18:40 ` Larry McVoy
2007-10-02 19:47 ` Rick Jones
2007-10-02 21:32 ` David Miller
2007-10-03 7:19 ` Bill Fink
2007-10-02 10:52 ` Herbert Xu
2007-10-02 15:09 ` Larry McVoy
2007-10-02 15:41 ` Larry McVoy
2007-10-02 16:25 ` Larry McVoy
2007-10-02 16:47 ` Stephen Hemminger
2007-10-02 16:49 ` Larry McVoy
2007-10-02 17:10 ` Stephen Hemminger
2007-10-15 12:40 ` Daniel Schaffrath
2007-10-15 15:49 ` Stephen Hemminger
2007-10-02 16:34 ` Linus Torvalds
2007-10-02 16:48 ` Larry McVoy
2007-10-02 21:16 ` David Miller
2007-10-02 21:26 ` Larry McVoy [this message]
2007-10-02 21:47 ` David Miller
2007-10-02 22:17 ` Rick Jones
2007-10-02 22:32 ` David Miller
2007-10-02 22:36 ` Larry McVoy
2007-10-02 22:59 ` Rick Jones
2007-10-03 8:02 ` David Miller
2007-10-02 16:48 ` Ben Greear
2007-10-02 17:11 ` Larry McVoy
2007-10-02 17:18 ` Ben Greear
2007-10-02 17:21 ` Larry McVoy
2007-10-02 17:54 ` Stephen Hemminger
2007-10-02 18:35 ` Larry McVoy
2007-10-02 18:29 ` John Heffner
2007-10-02 19:07 ` Larry McVoy
2007-10-02 19:29 ` Linus Torvalds
2007-10-02 20:31 ` David Miller
2007-10-02 19:33 ` Larry McVoy
2007-10-02 19:53 ` John Heffner
2007-10-02 20:14 ` Larry McVoy
2007-10-02 20:40 ` Rick Jones
2007-10-02 20:42 ` Wayne Scott
2007-10-02 21:56 ` Linus Torvalds
2007-10-02 19:27 ` Linus Torvalds
2007-10-02 19:53 ` Rick Jones
2007-10-02 20:33 ` David Miller
2007-10-02 20:44 ` Roland Dreier
2007-10-02 21:21 ` Larry McVoy
2007-10-03 21:13 ` Pekka Pietikainen
2007-10-03 21:23 ` Larry McVoy
2007-10-03 21:50 ` Pekka Pietikainen
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