netdev - Re: [RFC] New driver API to speed up small packets xmits

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Message-Id: <1178828480.4062.98.camel@localhost>
Date:	Thu, 10 May 2007 16:21:20 -0400
From:	jamal <hadi@...erus.ca>
To:	Gagan Arneja <gaagaan@...il.com>
Cc:	Sridhar Samudrala <sri@...ibm.com>,
	Rick Jones <rick.jones2@...com>,
	Krishna Kumar2 <krkumar2@...ibm.com>,
	Evgeniy Polyakov <johnpol@....mipt.ru>, netdev@...r.kernel.org
Subject: Re: [RFC] New driver API to speed up small packets xmits

On Thu, 2007-10-05 at 13:15 -0700, Gagan Arneja wrote:

> Really! It's just the transmit routine. How radical can that be?
> 

Ok, you have a point there, but it could be challenging with many
tunables:
For example:
my biggest challenge with the e1000 was just hacking up the DMA setup
path - i seem to get better numbers if i dont kick the DMA until i stash
all the packets on the ring first etc. It seemed counter-intuitive.

Now if you can ammortize PCI operations as well (the 10K cycles you
pointed out), i think thats where you get the best bang for the buck.

cheers,
jamal

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