netdev - Re: [WIP][PATCHES] Network xmit batching

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Message-ID: <20070622095935.GA14207@2ka.mipt.ru>
Date:	Fri, 22 Jun 2007 13:59:36 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Rick Jones <rick.jones2@...com>
Cc:	jamal <hadi@...erus.ca>, Krishna Kumar2 <krkumar2@...ibm.com>,
	Gagan Arneja <gaagaan@...il.com>, netdev@...r.kernel.org,
	Sridhar Samudrala <sri@...ibm.com>,
	David Miller <davem@...emloft.net>,
	Robert Olsson <Robert.Olsson@...a.slu.se>
Subject: Re: [WIP][PATCHES] Network xmit batching

On Thu, Jun 21, 2007 at 02:00:07PM -0700, Rick Jones (rick.jones2@...com) wrote:
> > Simple test included test -> desktop and vice versa traffic with 128 and
> > 4096 block size in netperf-2.4.3 setup.
> 
> Is that in conjunction with setting the test-specific -D to set
> TCP_NODELAY, or was Nagle left-on?  If the latter, perhaps timing issues
> could be why the confidence intervals weren't hit since the relative
> batching of 128byte sends into larger segments is something of a race.

I used this parameters:
netperf -l 60 -H kano -t TCP_STREAM -i 10,2 -I 99,5 -- -m 128 -s 128K
-S 128K

so without nodelay.

With nodelay I've gotten:
batch-128: 128.91 mbit/sec
mainline-128: 140.57 mbit/sec

which is about 5 times less than withouth nodelay (~760 mbit/s)
Although nodelay results look more realistic.


> rick jones

-- 
	Evgeniy Polyakov
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