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

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Date:	Fri, 30 Apr 2010 22:40:00 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	hadi@...erus.ca
Cc:	Changli Gao <xiaosuo@...il.com>,
	David Miller <davem@...emloft.net>, 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

Le vendredi 30 avril 2010 à 15:30 -0400, jamal a écrit :
> Eric!
> 
> I managed to mod your program to look conceptually similar to mine
> and i reproduced the results with same test kernel from yesterday. 
> So it is likely the issue is in using epoll vs not using any async as
> in your case.
> Results attached as well as modified program.
> 
> Note: the key things to remember:
> rps with this program gets worse over time and different net-next
> kernels since Apr14 (look at graph i supplied). Sorry, I am really
> busy-ed out to dig any further.
> 
> cheers,
> jamal
> 

I am lost.

I used your program, and with RPS off, I can get at most 220.000 pps
with my "old" hardware. I dont understand how you can reach 700.000 pps
with RPS off. Or is it with your Nehalem ?



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