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

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Message-ID: <1324476138.2728.65.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
Date:	Wed, 21 Dec 2011 15:02:18 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ian Campbell <Ian.Campbell@...rix.com>
Cc:	David Miller <davem@...emloft.net>,
	"jesse.brandeburg@...el.com" <jesse.brandeburg@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH 0/4] skb paged fragment destructors

Le mercredi 21 décembre 2011 à 13:48 +0000, Ian Campbell a écrit :
> On Wed, 2011-12-21 at 12:30 +0000, Eric Dumazet wrote:
> > Le mercredi 21 décembre 2011 à 11:18 +0000, Ian Campbell a écrit :
> > 
> > > 
> > > An order 1 allocation is in multiples of PAGE_SIZE, isn't it, even
> > > though they happen to be contiguous?
> > 
> > Really an order-1 allocation allocates one page, a compound one.
> 
> Oh, right, I see what you mean.
> 
> You snipped the question about the + 2, I take it you have no idea what
> it is all about either?
> 

No idea on this +2 point.

I know some hardwares have limits on a fragment length (for example IGB
uses IGB_MAX_DATA_PER_TXD limit), but I dont know why we add extra frags
in generic skb.



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