netdev - Re: compound skb frag pages appearing in start

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Message-ID: <1349792847.21172.4479.camel@edumazet-glaptop>
Date:	Tue, 09 Oct 2012 16:27:27 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ian Campbell <Ian.Campbell@...rix.com>
Cc:	Eric Dumazet <edumazet@...gle.com>,
	xen-devel <xen-devel@...ts.xen.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad@...nel.org>,
	Sander Eikelenboom <linux@...elenboom.it>
Subject: Re: compound skb frag pages appearing in start_xmit

On Tue, 2012-10-09 at 15:17 +0100, Ian Campbell wrote:

> Does the higher order pages effectively reduce the number of frags which
> are in use? e.g if MAX_SKB_FRAGS is 16, then for order-0 pages you could
> have 64K worth of frag data.
> 
> If we switch to order-3 pages everywhere then can the skb contain 512K
> of data, or does the effective maximum number of frags in an skb reduce
> to 2?

effective number of frags reduce to 2 or 3

(We still limit GSO packets to ~63536 bytes)


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