netdev - Re: [RFC] napi: limit GRO latency

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Message-ID: <1349725592.21172.3685.camel@edumazet-glaptop>
Date:	Mon, 08 Oct 2012 21:46:32 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	David Miller <davem@...emloft.net>, rick.jones2@...com,
	herbert@...dor.apana.org.au, netdev@...r.kernel.org,
	jesse@...ira.com
Subject: Re: [RFC] napi: limit GRO latency

On Mon, 2012-10-08 at 12:40 -0700, Stephen Hemminger wrote:
> On Mon, 08 Oct 2012 21:30:12 +0200
> Eric Dumazet <eric.dumazet@...il.com> wrote:
> 
> > System is under stress, you dont want to increase load at this point,
> > but increase bandwidth.
> > 
> > Really try this on a 40Gbe link and see how bad it is.
> 
> Not everybody has 40Gbe hardware just lying around available for testing :-)

;)

In fact, the current strategy to flush napi_gro when napi completes
might be not good for moderate traffic (thats 99% of the linux machines
I believe). We could have a deferred flush instead...

I dont know what strategy is used by hardware. But surely hardware uses
timers.


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