From: Ben Pfaff <blp@cs.stanford.edu>
To: David Miller <davem@davemloft.net>
Cc: jarkao2@gmail.com, 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 12:55:54 -0700 [thread overview]
Message-ID: <87zkvmvir9.fsf@benpfaff.org> (raw)
In-Reply-To: <20100912.085833.226777368.davem@davemloft.net> (David Miller's message of "Sun, 12 Sep 2010 08:58:33 -0700 (PDT)")
David Miller <davem@davemloft.net> writes:
>> 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?
>
> Then we won't get the rest of the advantages of using list_head such
> as prefetching during traversals, automatic debugging facilities, et al.
Did you see the recent patch from Andi Kleen where he proposes
removing this prefetching in most situations because the costs
outweigh the benefits on most modern architectures?
http://permalink.gmane.org/gmane.linux.kernel/1033281
I'm not saying that list_head doesn't have other advantages
though.
--
Ben Pfaff
http://benpfaff.org
next prev parent reply other threads:[~2010-09-12 20:27 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 [this message]
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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