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

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Date:	Tue, 4 Sep 2007 10:24:17 -0700
From:	"Mandeep Baines" <mandeep.baines@...il.com>
To:	"Daniele Venzano" <venza@...wnhat.org>
Cc:	hadi@...erus.ca, 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

Cool. I'll try to see if I can clock my pc lower and run the
experiments again. I'll measure cpu utilization also this time around.
That should be useful for extrapolating.

Regards,
Mandeep

On 9/4/07, Daniele Venzano <venza@...wnhat.org> wrote:
> ----- Message d'origine -----
> De: Mandeep Singh Baines <mandeep.baines@...il.com>
> Date: Mon, 3 Sep 2007 20:20:36 -0700
> Sujet: [PATCH] [sis900] convert to NAPI, WAS Re: pktgen terminating condition
>
> >Hi Daniele,
> >
> >Attached is a patch for converting the sis900 driver to NAPI. Please take a
> >look at let me know what you think. I'm not 100% sure if I'm handling the
> >rotting packet issue correctly or that I have the locking right in tx_timeout.
> >These might be areas to look at closely.
> >
> >I didn't see much saving in interrupts on my machine (too fast, I guess). But
> >I still think its beneficial: pushing work out of the interrupt handler into
> >a bottom half is a good thing and we no longer need to disable interrupts
> >in start_xmit.
> >
> >I did see a significant boost to tx performance by optimizing start_xmit: more
> >than double pps in pktgen.
> >
> >I'm also attaching some test results for various iterations of development.
>
> The patch looks good and I think it can be pushed higher (-mm ?) for some wider
> testing. I don't have the hardware available to do some tests myself,
> unfortunately, but it would be similar to yours anyway.
>
> I'd like to know how this works for people with less memory and slower CPU, but any
> kind of test run will be appreciated.
>
> Thanks, bye.
>
>
> --
> Daniele Venzano
> venza@...wnhat.org
>
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