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

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Message-ID: <OF7E8226CB.9B6FDC92-ON652572F4.003E9F60-652572F4.003F4BE0@in.ibm.com>
Date:	Fri, 8 Jun 2007 17:01:21 +0530
From:	Krishna Kumar2 <krkumar2@...ibm.com>
To:	hadi@...erus.ca
Cc:	David Miller <davem@...emloft.net>,
	Gagan Arneja <gaagaan@...il.com>,
	Evgeniy Polyakov <johnpol@....mipt.ru>, netdev@...r.kernel.org,
	Rick Jones <rick.jones2@...com>,
	Robert Olsson <Robert.Olsson@...a.slu.se>,
	Sridhar Samudrala <sri@...ibm.com>
Subject: Re: [WIP][PATCHES] Network xmit batching

Hi Jamal,

J Hadi Salim <j.hadi123@...il.com> wrote on 06/08/2007 04:44:06 PM:

> That should be fine as long as the sender is running the patched
> 2.6.22-rc4

Definitely :)

> Thats interesting - it is possible there is transient burstiness which
> fills up the ring.
> My observation of your results (hence my comments): for example the
> buffer size = 8B, TCP 1 process you achieve less than 70M.  That is less
> than 100Kpps on average being sent out. Very very tiny - so it is
> interesting that it is causing a shutdown.

I thought it comes to 1.147Mpps, or did I calculate wrong
(70*1024*1024/8/8) ?

> Also note something else strange that it is kind of strange that
> something like UDP which doesnt backoff will send out less
> packets/second ;->

Cannot explain that either :)

> BTW, another interesting things to do is ensure that several netperfs
> are running on different CPUs.

My script was doing that earlier, I trimmed all that to make it easier
to understand. Will post the larger version later.

> no problem.

Thanks, please let me know what you think of the patch I sent earlier.

I am running a larger 5 iteration run with buffer sizes :8,32,128,512,1
K,4K,16K.
It is going to run for around 12 hours and since I am moving house during
the
weekend, I will be able to look at the results only on Monday.

Regards,

- KK

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