netdev - Re: Getting physical packet counts with LRO enabled with ixgbe?

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Date:	Fri, 25 Sep 2009 14:56:30 -0700
From:	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	"greearb@...delatech.com" <greearb@...delatech.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Getting physical packet counts with LRO enabled with ixgbe?

On Fri, 2009-09-25 at 14:45 -0700, Herbert Xu wrote:
> Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com> wrote:
> >
> >> That's a bummer.  I'm guessing you might get close to right on average with some
> >> trivial math, but if someone is sending you pkts with size of 1000 and
> >> your MTU is 1500, would there be any way to tell that the pkts were originally
> >> 1000 bytes instead of 1500?
> > 
> > Good point.
> 
> Well if you did GRO instead of LRO then none of this would matter :)

ixgbe uses GRO, but we have HW RSC/LRO running on 82599 adapters
underneath GRO.

-PJ

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