netdev - Re: [PATCH] xen/netfront: improve truesize tracking

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Message-ID: <1355847180.9380.21.camel@edumazet-glaptop>
Date:	Tue, 18 Dec 2012 08:13:00 -0800
From:	Eric Dumazet <erdnetdev@...il.com>
To:	Ian Campbell <Ian.Campbell@...rix.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Sander Eikelenboom <linux@...elenboom.it>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	annie li <annie.li@...cle.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>
Subject: Re: [PATCH] xen/netfront: improve truesize tracking

On Tue, 2012-12-18 at 15:26 +0000, Ian Campbell wrote:

> So actually we want += PAGE_SIZE * skb_shinfo(skb)->nr_frags ?
> 

I dont know what are the real frag sizes in your case.

Some drivers allocate a full page for an ethernet frame, others use half
of a page, it really depends.

As the frag ABI doesnt contain real size, its ok in this case to account
the actual frag size.

(skb->data_len in your driver)



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