From: Andi Kleen <ak@muc.de>
To: Marc Herbert <marc.herbert@free.fr>
Cc: netdev@oss.sgi.com
Subject: Re: TxDescriptors -> 1024 default. Please not for every NIC!
Date: Wed, 19 May 2004 13:54:53 +0200 [thread overview]
Message-ID: <m3isespr76.fsf@averell.firstfloor.org> (raw)
In-Reply-To: <Pine.LNX.4.58.0405190256010.30653@fcat> (Marc Herbert's message of "Wed, 19 May 2004 11:30:28 +0200 (CEST)")
Marc Herbert <marc.herbert@free.fr> writes:
>
> PS: several people seem to think TCP "drops" packets when the qdisc is
> full. My analysis of the code _and_ my experiments makes me think they
> are wrong: TCP rather "blocks" when the qdisc is full. See explanation
> here: <http://oss.sgi.com/archives/netdev/2004-05/msg00151.html>
> (Subject: Re: TcpOutSegs way too optimistic (netstat -s))
This behaviour was only added relatively recently (in late 2.3.x timeframe)
I believe all the default queue lengths tunings were done before that.
So it would probably make sense to reevaluate/rebenchmark the default
queue lengths for various devices with the newer code.
-Andi
next prev parent reply other threads:[~2004-05-19 11:54 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-09 3:14 [e1000 2.6 10/11] TxDescriptors -> 1024 default Feldman, Scott
2003-09-11 19:18 ` Jeff Garzik
2003-09-11 19:45 ` Ben Greear
2003-09-11 19:59 ` Jeff Garzik
2003-09-11 20:12 ` David S. Miller
2003-09-11 20:40 ` Ben Greear
2003-09-11 21:07 ` David S. Miller
2003-09-11 21:29 ` Ben Greear
2003-09-11 21:29 ` David S. Miller
2003-09-11 21:47 ` Ricardo C Gonzalez
2003-09-11 22:00 ` Jeff Garzik
2003-09-11 22:15 ` Ben Greear
2003-09-11 23:02 ` David S. Miller
2003-09-11 23:22 ` Ben Greear
2003-09-11 23:29 ` David S. Miller
2003-09-12 1:34 ` jamal
2003-09-12 2:20 ` Ricardo C Gonzalez
2003-09-12 3:05 ` jamal
2003-09-13 3:49 ` David S. Miller
2003-09-13 11:52 ` Robert Olsson
2003-09-15 12:12 ` jamal
2003-09-15 13:45 ` Robert Olsson
2003-09-15 23:15 ` David S. Miller
2003-09-16 9:28 ` Robert Olsson
2003-09-14 19:08 ` Ricardo C Gonzalez
2003-09-15 2:50 ` David Brownell
2003-09-15 8:17 ` David S. Miller
2004-05-15 12:14 ` TxDescriptors -> 1024 default. Please not for every NIC! Marc Herbert
2004-05-19 9:30 ` Marc Herbert
2004-05-19 10:27 ` Pekka Pietikainen
2004-05-20 14:11 ` Luis R. Rodriguez
2004-05-20 16:38 ` [Prism54-devel] " Jean Tourrilhes
2004-05-20 16:45 ` Tomasz Torcz
2004-05-20 17:13 ` zero copy TX in benchmarks was " Andi Kleen
2004-05-19 11:54 ` Andi Kleen [this message]
[not found] <C925F8B43D79CC49ACD0601FB68FF50CDB13D3@orsmsx408>
2004-06-02 19:14 ` Marc Herbert
2004-06-02 19:49 ` Cheng Jin
2004-06-05 14:37 ` jamal
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