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

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Message-ID: <20070619164420.GB17942@2ka.mipt.ru>
Date:	Tue, 19 Jun 2007 20:44:20 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	jamal <hadi@...erus.ca>
Cc:	Krishna Kumar2 <krkumar2@...ibm.com>,
	Gagan Arneja <gaagaan@...il.com>, netdev@...r.kernel.org,
	Rick Jones <rick.jones2@...com>,
	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 Tue, Jun 19, 2007 at 12:32:48PM -0400, jamal (hadi@...erus.ca) wrote:
> > > pktgen reults are quite poor:
> > > batch (changed from default script: count reduced, clone increased to 10k)
> > > 241319pps 115Mb/sec
> 
> BTW, dont turn on the cloning - leave it as 1 so we can have every
> packet alloced so as to have worst case scenario.

here is with batch_min 400 and clone 1:
184251pps 88Mb/sec (88440480bps) errors: 0
A bit better than without cloning, but that might be a noise.

batch_min 0 and clone 1:
258564pps 124Mb/sec (124110720bps) errors: 0
Noticebly better than with cloning, but still much worse than mainline.

> > > mainline (the same script, on start it wrote about unsupported batch_low
> > > parameter:
> > > 497520pps 238Mb/sec
> > 
> > 
> > And here is with batch_low=400:
> 
> I am going to get rid of that batch param - it doesnt seem to matter
> what that value is in the long run.

Hmm, with that parameter result is 87Mb/sec while with batch_min equal
to zero it is 115Mb/sec. Without batching result is even better -
238Mb/sec, so it does seem to affect performance.

> > Result: OK: T4143884(U4143864+I20+A4007752+T127073) usec, P1000000 TE8511TS1(B60,-1frags)
> 
> So on average you have been sending about 120 packets per batch - which
> should give you decent numbers. Lets see how Robert responds and if you
> have time, turn off the kernel configs like i did.

It is not turned on in my config.

> cheers,
> jamal

-- 
	Evgeniy Polyakov
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