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

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Message-ID: <46437FAF.50004@vmware.com>
Date:	Thu, 10 May 2007 13:25:19 -0700
From:	Gagan Arneja <gagan@...are.com>
To:	hadi@...erus.ca
CC:	Gagan Arneja <gaagaan@...il.com>,
	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


> 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.

That seems to make sense. The rings are(?) in system memory and you can 
write to them faster. Kicking the DMA needs a transaction on the PCI 
bus, which can be painfully slow...

--
Gagan
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