From: Jarek Poplawski <jarkao2@gmail.com>
To: David Miller <davem@davemloft.net>
Cc: eric.dumazet@gmail.com, netdev@vger.kernel.org
Subject: Re: [PATCH net-next-2.6] net: pskb_expand_head() optimization
Date: Sun, 12 Sep 2010 12:45:34 +0200 [thread overview]
Message-ID: <20100912104534.GA2056@del.dom.local> (raw)
In-Reply-To: <20100911.203002.193707453.davem@davemloft.net>
On Sat, Sep 11, 2010 at 08:30:02PM -0700, David Miller wrote:
> From: Jarek Poplawski <jarkao2@gmail.com>
> Date: Sat, 11 Sep 2010 14:31:40 +0200
>
> > Otherwise seems OK, but I still would like to know the scenario
> > demanding this change.
>
> I want to make sk_buff use list_head, including all uses such as
> frag_list et al.
>
> If the frag_list chain can be shared, a doubly linked list cannot be
> used.
>
> This is someting I've been gradually working on now for more than 2
> years :)
Hmm... Then the first message/changelog in this thread seems to
describe the future bug, only with doubly linked lists. If so, it was
a bit misleading to me ;-)
Then a few more questions:
1) if doubly linked lists really require such pskb_copying, isn't it
all too costly?
2) why skb_clone isn't enough instead of pskb_copy?
3) since skb_clone has some cost too, why e.g. saving only the pointer
to the tail of the list in skb_shared_info isn't enough?
Jarek P.
next prev parent reply other threads:[~2010-09-12 10:45 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 [this message]
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
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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