netdev - Re: [PATCH net-next-2.6] net: speedup udp receive path

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Date:	Wed, 28 Apr 2010 19:44:53 -0400
From:	jamal <hadi@...erus.ca>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, xiaosuo@...il.com,
	therbert@...gle.com, shemminger@...tta.com, netdev@...r.kernel.org,
	Eilon Greenstein <eilong@...adcom.com>,
	Brian Bloniarz <bmb@...enacr.com>
Subject: Re: [PATCH net-next-2.6] net: speedup udp receive path

On Wed, 2010-04-28 at 16:06 +0200, Eric Dumazet wrote:

> Here it is ;)

Sorry - things got a little hectic with TheMan.

I am afraid i dont have good news.
Actually, I should say i dont have good news in regards to rps.
For my sample app, two things seem to be happening:
a) The overall performance has gotten better for both rps
and non-rps.
b) non-rps is now performing relatively better

This is just what i see in net-next not related to your patch.
It seems the kernels i tested prior to April 23 showed rps better.
The one i tested on Apr23 showed rps being about the same as non-rps.
As i stated in my last result posting, I thought i didnt test properly
but i did again today and saw the same thing. And now non-rps is
_consistently_ better.
So some regression is going on...

Your patch has improved the performance of rps relative to what is in
net-next very lightly; but it has also improved the performance of
non-rps;->
My traces look different for the app cpu than yours - likely because of
the apps being different.

At the moment i dont have time to dig deeper into code, but i could
test as cycles show up.

I am attaching the profile traces and results.

cheers,
jamal

View attachment "sum-apr23and28.txt" of type "text/plain" (1469 bytes)

View attachment "nn-apr28-summary.txt" of type "text/plain" (78978 bytes)