netdev - Re: [0/14] GRO: Lots of microoptimisations

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Message-ID: <20090527230858.GA24278@gondor.apana.org.au>
Date:	Thu, 28 May 2009 09:08:58 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Benjamin LaHaise <ben.lahaise@...erion.com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [0/14] GRO: Lots of microoptimisations

On Wed, May 27, 2009 at 01:52:23PM -0400, Benjamin LaHaise wrote:
> 
> 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 

Slower compared to LRO or GRO off?

> 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.

What sort of hints do you have?

There aren't any current support for that but I'm happy to add
things as appropriate.

Thanks,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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