netdev - Re: [PATCH] [sis900] convert to NAPI, WAS Re: pktgen terminating condition

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Date:	Tue, 04 Sep 2007 09:03:56 -0400
From:	jamal <hadi@...erus.ca>
To:	Mandeep Singh Baines <mandeep.baines@...il.com>
Cc:	Daniele Venzano <venza@...wnhat.org>, davem@...emloft.net,
	rick.jones2@...com, msb@...gle.com, netdev@...r.kernel.org,
	grundler@...gle.com, robert.olsson@....uu.se, jeff@...zik.org,
	nhorman@...driver.com
Subject: Re: [PATCH] [sis900] convert to NAPI, WAS Re: pktgen terminating
	condition

On Mon, 2007-03-09 at 20:20 -0700, Mandeep Singh Baines wrote:

> I didn't see much saving in interrupts on my machine (too fast, I guess). 

You could try the idea suggested by Dave earlier and just turn interupts
for every nth packet. That should cut down the numbers.

> I did see a significant boost to tx performance by optimizing start_xmit: more
> than double pps in pktgen.

148Kpps on a slow piece of hardware aint bad - Good Stuff. I wonder how
much CPU is being abused.

If you wanna go one extra mile (separate future patch): get rid of that
tx lock and use netif_tx_lock on the interupt path. Look at some sane
driver like tg3 for reference.

cheers,
jamal

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