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Message-ID: <20090527175223.GB7804@neterion.com>
Date: Wed, 27 May 2009 13:52:23 -0400
From: Benjamin LaHaise <ben.lahaise@...erion.com>
To: Herbert Xu <herbert@...dor.apana.org.au>
Cc: "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [0/14] GRO: Lots of microoptimisations
Hi Herbert,
On Wed, May 27, 2009 at 02:45:39PM +1000, Herbert Xu wrote:
> Hi Dave:
>
> This series of patches brings GRO performance to within 1% of LRO
> on the slow machine that I was testing. I can overtake LRO by
> deleting the IP checksum test and the Ethernet header test from
> GRO, which LRO doesn't do anyway, but that's not very nice :)
>
> I'm still looking at other optimisations as time allows.
A few questions for you: I've been looking a bit into potential GRO
optimisations that are possible with the vxge driver. At least from my
existing testing on a P4 Xeon, it seems that doing packet rx via
napi_gro_receive() was a bit slower. I'll retest with these changes
of yours. What platform have your tests been run on? Also, do you have
any notes/ideas on how best to make use of the GRO functionality within
the kernel? I'm hoping it's possible to make use of a few of the hardware
hints to improve fast path performance.
-ben
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