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

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Date:	Tue, 15 May 2007 18:48:37 -0400
From:	jamal <hadi@...erus.ca>
To:	David Miller <davem@...emloft.net>
Cc:	xma@...ibm.com, rdreier@...co.com, ak@...e.de, krkumar2@...ibm.com,
	netdev@...r.kernel.org, ashwin.chaugule@...unite.com,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Max Krasnyansky <maxk@...lcomm.com>,
	Gagan Arneja <gagan@...are.com>
Subject: Re: [WIP] [PATCH] WAS Re: [RFC] New driver API to speed up small
	packets xmits

On Tue, 2007-15-05 at 18:17 -0400, jamal wrote:

> I will post a patch for tun device in a few minutes
> that i use to test on my laptop (i need to remove some debugs) to show
> an example.

Ok, here it is. 
The way i test is to point packets at a tun device. [One way i do it
is attach an ingress qdisc on lo; attach a u32 filter to match all;
on match redirect to the tun device].
The user space program reading sleeps for about a second every 20
packets or so. This forces things to accumulate in the drivers queue.
Backpressure builds up and the throttling effect is really nice to see
working.

I will try to post the e1000 patch tonight or tommorow morning.

cheers,
jamal

View attachment "tun-b" of type "text/x-patch" (3735 bytes)