linux-kernel - RE: skbuff truesize incorrect.

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6D1724CACF@AcuExch.aculab.com>
Date:	Fri, 23 May 2014 15:30:37 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Eric Dumazet' <eric.dumazet@...il.com>,
	Jim Baxter <jim_baxter@...tor.com>
CC:	'Bjørn Mork' <bjorn@...k.no>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	"kamal@...onical.com" <kamal@...onical.com>,
	"edumazet@...gle.com" <edumazet@...gle.com>,
	"mszeredi@...e.cz" <mszeredi@...e.cz>,
	"fw@...len.de" <fw@...len.de>
Subject: RE: skbuff truesize incorrect.

From: Eric Dumazet
...
> TCP stack uses fast clones, and current stack gives them a truesize of
> 2048 + sizeof(sk_buff), while it really should be 2048 +
> 2*sizeof(sk_buff)
> 
> Luckily, GSO/TSO tends to reduce the error, as skbs overhead is lower.

Doesn't that affect the tx side - where the truesize doesn't matter as much?

	David