netdev - Re: [PATCH v2 net-next] net: introduce gro_frag_list

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Message-ID: <1383107681.4857.33.camel@edumazet-glaptop.roam.corp.google.com>
Date:	Tue, 29 Oct 2013 21:34:41 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	David Miller <davem@...emloft.net>, christoph.paasch@...ouvain.be,
	netdev@...r.kernel.org, hkchu@...gle.com, mwdalton@...gle.com
Subject: Re: [PATCH v2 net-next] net: introduce gro_frag_list_enable sysctl

On Wed, 2013-10-30 at 12:19 +0800, Herbert Xu wrote:
> On Tue, Oct 29, 2013 at 09:16:17PM -0700, Eric Dumazet wrote:
> >
> > The thing is this only matters for hosts receiving at line rate on few
> > TCP flows.
> > 
> > A router should not build too big GRO packets, as it adds latencies.
> > 
> > Really, we had to make TSO packets being auto sized, lets not add the
> > syndrome again.
> > 
> > So I do not really understand David concern about emitting a warning.
> > 
> > If a machine is used as a router, building GRO packets of 17 MSS is
> > absolutely fine.
> 
> It's not just routers you know, we use the same code on bridges
> as part of virtualisation.  So it absolutely does matter.
> 

What matters ?

GRO ?

Or making size of GRO packets not too big, or making them bigger ?

Before my patch, GRO packets were 17 MSS, and nobody complained packets
were too small, so what are you saying exactly ?





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