netdev - Re: [PATCH 0/4] skb paged fragment destructors

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Message-ID: <1321541486.2751.51.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
Date:	Thu, 17 Nov 2011 15:51:26 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ian Campbell <Ian.Campbell@...rix.com>
Cc:	David Miller <davem@...emloft.net>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH 0/4] skb paged fragment destructors

Le jeudi 17 novembre 2011 à 14:45 +0000, Ian Campbell a écrit :

> Am I right that it's not so much a case of fitting into half a page but
> more like not wasting nearly half a page if you end up requiring a 4096
> byte allocation? (This is probably splitting hairs, I'm really just
> curious)

Performance implications are quite high :

Here is what I did to bnx2x driver to reduce the space from 4096 to
2048, and you can see performance results :

http://git.kernel.org/?p=linux/kernel/git/davem/net-next.git;a=commit;h=e52fcb2462ac484e6dd6e68869536609f0216938



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