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Date:	Thu, 7 Jun 2007 11:46:25 +0530
From:	Krishna Kumar2 <>
Cc:	Gagan Arneja <>,
	Evgeniy Polyakov <>,,
	Rick Jones <>,
	Sridhar Samudrala <>
Subject: Re: [WIP][PATCHES] Network xmit batching

My somewhat confusing netperf script (to run on client) is attached below.
Server just requires
to run netserver. Client is not completely accurate since I am not using
netperf4 (moving to
that after some initial hiccups).


- KK

(See attached file: netperf.scp)

J Hadi Salim <> wrote on 06/06/2007 07:19:21 PM:

> Folks,
> While Krishna and I have been attempting this on the side, progress has
> been rather slow - so this is to solicit for more participation so we
> can get this over with faster. Success (myself being conservative when
> it comes to performance) requires testing on a wide variety of hardware.
> The results look promising - certainly from a pktgen perspective where
> performance has been known in some cases to go up over 50%.
> Tests by Sridhar on a low number of TCP flows also indicate improved
> performance as well as lowered CPU use.
> I have setup the current state of my patches against Linus tree at:
> git://
> This is also clean against 2.6.22-rc4. So if you want just a diff that
> will work against 2.6.22-rc4 - i can send it to you.
> I also have a tree against Daves net-2.6 at
> git://
> but iam abandoning that effort until we get this stable due to the
> occasional bug that cropped up(like e1000).
> I am attaching a pktgen script. There is one experimental parameter
> called "batch_low" - for starters just leave it at 0 in order to reduce
> experimental variance. If you have solid results you can muck around
> with it.
> KK has a netperf script he has been using - if you know netperf your
> help will really be appreciated in testing it on your hardware.
> KK, can you please post your script?
> Testing with forwarding and bridging will also be appreaciated.
> Above that, suggestions to changes as long as they are based on
> verifiable results or glaringly obvious changes are welcome. My
> preference at the moment is to flesh out the patch as is and then
> improve on it later if it shows it has some value on a wide variety of
> apps. As the subject is indicating this is a WIP and as all eulas
> suggest "subject to change without notice".
> If you help out, when you post your results, can you please say what
> hardware and setup was?
> The only real driver that has been changed is e1000 for now. KK is
> working on something infiniband related and i plan (if noone beats me)
> to get tg3 working. It would be nice if someone converted some 10G
> ethernet driver.
> cheers,
> jamal
> [attachment "pktgen.batch-1-1" deleted by Krishna Kumar2/India/IBM]
Download attachment "netperf.scp" of type "application/octet-stream" (1661 bytes)

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