From: Jarek Poplawski <jarkao2@gmail.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: David Miller <davem@davemloft.net>, netdev@vger.kernel.org
Subject: Re: [PATCH net-next-2.6] net: pskb_expand_head() optimization
Date: Mon, 20 Sep 2010 09:14:26 +0000 [thread overview]
Message-ID: <20100920091425.GA8381@ff.dom.local> (raw)
In-Reply-To: <1284973320.3420.49.camel@edumazet-laptop>
On Mon, Sep 20, 2010 at 11:02:00AM +0200, Eric Dumazet wrote:
> Le lundi 20 septembre 2010 ?? 07:21 +0000, Jarek Poplawski a écrit :
>
> > Probably we could start from enhacing moving drivers to paged skbs
> > where possible. And maybe simplifying the skb model by not allowing
> > frags and frag lists together?
> >
>
> Sure. I believe current model, pre-allocating skb in huge tx rings is a
> waste of mem bandwidth anyway. (I am refering to the struct sk_buff
> itself, not the payload part)
>
> Of course some drivers are doing it right, using netdev_alloc_skb()
> right before feeding this skb to network stack, not an old one.
>
> > Btw, I wonder what is the exact reason we can't use only
> > NET_SKBUFF_DATA_USES_OFFSET?
>
> I see no real reason.
>
> On 32bit arches, it might be faster to manipulate pointers, and not
> 'base+offset' values.
The only reason is code readability and maintenance. Did anybody check
how much faster?
Jarek P.
next prev parent reply other threads:[~2010-09-20 9:14 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-03 3:43 [PATCH] net: Frag list lost on head expansion David Miller
2010-09-03 5:48 ` Eric Dumazet
2010-09-03 6:19 ` Eric Dumazet
2010-09-03 9:09 ` [PATCH net-next-2.6] net: pskb_expand_head() optimization Eric Dumazet
2010-09-03 13:46 ` David Miller
2010-09-07 2:20 ` David Miller
2010-09-07 5:02 ` Eric Dumazet
2010-09-07 5:05 ` David Miller
2010-09-07 9:16 ` Jarek Poplawski
2010-09-07 9:37 ` Eric Dumazet
2010-09-10 19:54 ` David Miller
2010-09-11 12:31 ` Jarek Poplawski
2010-09-12 3:30 ` David Miller
2010-09-12 10:45 ` Jarek Poplawski
2010-09-12 10:58 ` Jarek Poplawski
2010-09-12 15:58 ` David Miller
2010-09-12 16:13 ` David Miller
2010-09-12 20:57 ` Jarek Poplawski
2010-09-12 22:08 ` David Miller
2010-09-13 7:49 ` Jarek Poplawski
2010-09-12 19:55 ` Ben Pfaff
2010-09-12 20:24 ` David Miller
2010-09-12 20:45 ` Jarek Poplawski
2010-09-20 0:17 ` David Miller
2010-09-20 7:21 ` Jarek Poplawski
2010-09-20 9:02 ` Eric Dumazet
2010-09-20 9:14 ` Jarek Poplawski [this message]
2010-09-20 12:12 ` Jarek Poplawski
2010-09-20 12:40 ` Eric Dumazet
2010-09-20 16:59 ` David Miller
2010-09-07 1:25 ` David Miller
-- strict thread matches above, loose matches on Subject: below --
2010-07-22 19:12 [PATCH] Fix corruption of skb csum field in pskb_expand_head() of net/core/skbuff.c Andrea Shepard
2010-07-23 5:09 ` [PATCH net-next-2.6] net: pskb_expand_head() optimization Eric Dumazet
2010-07-25 4:06 ` David Miller
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