From: Andi Kleen <andi@firstfloor.org>
To: David Miller <davem@davemloft.net>
Cc: andi@firstfloor.org, md@bts.sk, netdev@vger.kernel.org
Subject: Re: TCP rx window autotuning harmful at LAN context
Date: Wed, 11 Mar 2009 16:01:49 +0100 [thread overview]
Message-ID: <20090311150149.GG11935@one.firstfloor.org> (raw)
In-Reply-To: <20090311.063058.236235660.davem@davemloft.net>
On Wed, Mar 11, 2009 at 06:30:58AM -0700, David Miller wrote:
> From: Andi Kleen <andi@firstfloor.org>
> Date: Wed, 11 Mar 2009 11:03:35 +0100
>
> > Perhaps this points to the default buffer sizing heuristics to
> > be too aggressive for >= 1GB?
>
> It's necessary Andi, you can't fill a connection on a trans-
> continental connection without at least a 4MB receive buffer.
Seems pretty arbitary to me. It's the value for a given bandwidth*latency
product, but why not half or twice the bandwidth? I don't think
that number is written in stone like you claim.
Anyways it was just a test patch and it indeeds seems to address
the problem at least partly.
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
next prev parent reply other threads:[~2009-03-11 14:42 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-09 11:25 TCP rx window autotuning harmful at LAN context Marian Ďurkovič
2009-03-09 18:01 ` John Heffner
2009-03-09 20:05 ` Marian Ďurkovič
2009-03-09 20:24 ` Stephen Hemminger
2009-03-10 0:09 ` David Miller
2009-03-10 0:34 ` Rick Jones
2009-03-10 3:55 ` John Heffner
2009-03-10 17:20 ` Rick Jones
2009-03-11 10:03 ` Andi Kleen
2009-03-11 11:03 ` Marian Ďurkovič
2009-03-11 13:30 ` David Miller
2009-03-11 15:01 ` Andi Kleen [this message]
2009-03-11 14:56 ` Marian Ďurkovič
2009-03-11 15:34 ` John Heffner
[not found] ` <20090309195906.M50328@bts.sk>
2009-03-09 20:23 ` John Heffner
2009-03-09 20:33 ` Stephen Hemminger
2009-03-09 23:52 ` David Miller
2009-03-10 0:09 ` John Heffner
2009-03-10 5:19 ` Eric Dumazet
[not found] ` <20090310104956.GA81181@bts.sk>
2009-03-10 11:30 ` David Miller
2009-03-10 11:46 ` Marian Ďurkovič
2009-03-10 15:23 ` John Heffner
2009-03-10 16:00 ` Marian Ďurkovič
2009-03-10 16:18 ` David Miller
2009-03-11 8:29 ` Marian Ďurkovič
2009-03-11 8:41 ` David Miller
2009-03-11 9:05 ` Marian Ďurkovič
2009-03-11 9:11 ` Eric Dumazet
2009-03-11 13:25 ` David Miller
2009-03-11 9:02 ` Rémi Denis-Courmont
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