netdev - Re: [PATCH 5/7] xen-netfront: reduce gso_max_size to account for ethernet header

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Message-ID: <1365771499.4459.2.camel@edumazet-glaptop>
Date:	Fri, 12 Apr 2013 05:58:19 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ian Campbell <Ian.Campbell@...rix.com>
Cc:	Wei Liu <wei.liu2@...rix.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	David Vrabel <david.vrabel@...rix.com>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	"annie.li@...cle.com" <annie.li@...cle.com>,
	"wdauchy@...il.com" <wdauchy@...il.com>
Subject: Re: [PATCH 5/7] xen-netfront: reduce gso_max_size to account for
 ethernet header

On Fri, 2013-04-12 at 10:43 +0100, Ian Campbell wrote:
> On Fri, 2013-04-12 at 10:34 +0100, Wei Liu wrote:

> > But we don't have handle on this. If I understand correctly the
> > discussion in other thread, 90 is empirical value, not something
> > documented.
> 
> My original question was effectively "is anyone else going to be
> interested in this empirical value", if so then it seems like it would
> be useful to have it centrally defined.
> 

This could be MAX_TCP_HEADER. Probably a bit overestimated but do we
care ?



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