netdev - Re: [PATCH V6 2/4 net-next] skbuff: Add userspace zero-copy buffers in skb

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Message-ID: <1306443325.2543.22.camel@edumazet-laptop>
Date:	Thu, 26 May 2011 22:55:25 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Shirley Ma <mashirle@...ibm.com>
Cc:	David Miller <davem@...emloft.net>, mst@...hat.com,
	Avi Kivity <avi@...hat.com>, Arnd Bergmann <arnd@...db.de>,
	netdev@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V6 2/4 net-next] skbuff: Add userspace zero-copy
 buffers in skb

Le jeudi 26 mai 2011 à 13:24 -0700, Shirley Ma a écrit :

> I could reduce callback pointer by moving it to *arg, but not desc, this
> indicates that which buffer DMA hasn't done yet in *arg.


I guess you dont need to use skb itself to hold all your states ?

I understand its convenient for you, but I believe its worth the pain to
use only one pointer to a (small) object where you put all your stuff.

Some machines alloc/free millions of skbs per second. 

If/when most skb uses are for userspace zero-copy buffers we can embbed
your small object in skb itself ;)


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