From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: [PATCH net-next-2.6] net: speedup udp receive path
Date: Fri, 30 Apr 2010 22:40:00 +0200
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Cc: Changli Gao <xiaosuo@gmail.com>,
	David Miller <davem@davemloft.net>, therbert@google.com,
	shemminger@vyatta.com, netdev@vger.kernel.org,
	Eilon Greenstein <eilong@broadcom.com>,
	Brian Bloniarz <bmb@athenacr.com>
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Le vendredi 30 avril 2010 =C3=A0 15:30 -0400, jamal a =C3=A9crit :
> Eric!
>=20
> I managed to mod your program to look conceptually similar to mine
> and i reproduced the results with same test kernel from yesterday.=20
> 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.
>=20
> 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.
>=20
> cheers,
> jamal
>=20

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 ?