From: Andi Kleen <ak@suse.de>
To: "David S. Miller" <davem@redhat.com>
Cc: ak@suse.de, leonid.grossman@neterion.com, davem@davemloft.net,
hadi@cyberus.ca, becker@scyld.com, rick.jones2@hp.com,
netdev@oss.sgi.com
Subject: Re: RFC: NAPI packet weighting patch
Date: Thu, 23 Jun 2005 01:23:45 +0200 [thread overview]
Message-ID: <20050622232345.GD14251@wotan.suse.de> (raw)
In-Reply-To: <20050622.191956.39166724.davem@redhat.com>
On Wed, Jun 22, 2005 at 07:19:56PM -0400, David S. Miller wrote:
> From: Andi Kleen <ak@suse.de>
> Date: Thu, 23 Jun 2005 01:13:00 +0200
>
> > The computing time must be quite long to be really a win.
> > You need to waste a few hundred cycles at least on a modern fast CPU.
>
> SKB allocation more than fits this requirement, and that is exactly
> what the RX descriptor replenishment will do.
It shouldn't in theory. Unless they did something bad to the slab
allocator again when I wasn't looking ;-)
>
> Even if SKB allocation was only half the necessary number of cycles
> for the prefetch to hit the cpu, it'd still be a win.
If it's too small then it might be left in the noise.
-Andi
next prev parent reply other threads:[~2005-06-22 23:23 UTC|newest]
Thread overview: 121+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-06 20:29 RFC: NAPI packet weighting patch Ronciak, John
2005-06-06 23:55 ` Mitch Williams
2005-06-07 0:08 ` Ben Greear
2005-06-08 1:50 ` Jesse Brandeburg
2005-06-07 4:53 ` Stephen Hemminger
2005-06-07 12:38 ` jamal
2005-06-07 12:06 ` Martin Josefsson
2005-06-07 13:29 ` jamal
2005-06-07 12:36 ` Martin Josefsson
2005-06-07 16:34 ` Robert Olsson
2005-06-07 23:19 ` Rick Jones
2005-06-21 20:37 ` David S. Miller
2005-06-22 7:27 ` Eric Dumazet
2005-06-22 8:42 ` P
2005-06-22 19:37 ` jamal
2005-06-23 8:56 ` P
2005-06-21 20:20 ` David S. Miller
2005-06-21 20:38 ` Rick Jones
2005-06-21 20:55 ` David S. Miller
2005-06-21 21:47 ` Andi Kleen
2005-06-21 22:22 ` Donald Becker
2005-06-21 22:34 ` Andi Kleen
2005-06-22 0:08 ` Donald Becker
2005-06-22 4:44 ` Chris Friesen
2005-06-22 11:31 ` Andi Kleen
2005-06-22 16:23 ` Leonid Grossman
2005-06-22 16:37 ` jamal
2005-06-22 18:00 ` Leonid Grossman
2005-06-22 18:06 ` Andi Kleen
2005-06-22 20:22 ` David S. Miller
2005-06-22 20:35 ` Rick Jones
2005-06-22 20:43 ` David S. Miller
2005-06-22 21:10 ` Andi Kleen
2005-06-22 21:16 ` David S. Miller
2005-06-22 21:53 ` Chris Friesen
2005-06-22 22:11 ` Andi Kleen
2005-06-22 21:38 ` Eric Dumazet
2005-06-22 22:13 ` Eric Dumazet
2005-06-22 22:30 ` David S. Miller
2005-06-22 22:23 ` David S. Miller
2005-06-23 12:14 ` jamal
2005-06-23 17:36 ` David Mosberger
2005-06-22 22:42 ` Leonid Grossman
2005-06-22 23:13 ` Andi Kleen
2005-06-22 23:19 ` David S. Miller
2005-06-22 23:23 ` Andi Kleen [this message]
2005-06-22 17:05 ` Andi Kleen
-- strict thread matches above, loose matches on Subject: below --
2005-06-07 16:23 Ronciak, John
2005-06-07 20:21 ` David S. Miller
2005-06-08 2:20 ` Jesse Brandeburg
2005-06-08 3:31 ` David S. Miller
2005-06-08 3:43 ` David S. Miller
2005-06-08 13:36 ` jamal
2005-06-09 21:37 ` Jesse Brandeburg
2005-06-09 22:05 ` Stephen Hemminger
2005-06-09 22:12 ` Jesse Brandeburg
2005-06-09 22:21 ` David S. Miller
2005-06-09 22:21 ` jamal
2005-06-09 22:22 ` David S. Miller
2005-06-09 22:20 ` jamal
2005-06-06 15:35 Ronciak, John
2005-06-06 19:47 ` David S. Miller
2005-06-03 18:19 Ronciak, John
2005-06-03 18:33 ` Ben Greear
2005-06-03 18:49 ` David S. Miller
2005-06-03 18:59 ` Ben Greear
2005-06-03 19:02 ` David S. Miller
2005-06-03 20:17 ` Robert Olsson
2005-06-03 20:30 ` David S. Miller
2005-06-03 17:40 Ronciak, John
2005-06-03 18:08 ` Robert Olsson
2005-06-03 0:11 Ronciak, John
2005-06-03 0:18 ` David S. Miller
2005-06-03 2:32 ` jamal
2005-06-03 17:43 ` Mitch Williams
2005-06-03 18:38 ` David S. Miller
2005-06-03 18:42 ` jamal
2005-06-03 19:01 ` David S. Miller
2005-06-03 19:28 ` Mitch Williams
2005-06-03 19:59 ` jamal
2005-06-03 20:31 ` David S. Miller
2005-06-03 21:12 ` Jon Mason
2005-06-03 20:22 ` David S. Miller
2005-06-03 20:29 ` David S. Miller
2005-06-03 19:49 ` Michael Chan
2005-06-03 20:59 ` Lennert Buytenhek
2005-06-03 20:35 ` Michael Chan
2005-06-03 22:29 ` jamal
2005-06-04 0:25 ` Michael Chan
2005-06-05 21:36 ` David S. Miller
2005-06-06 6:43 ` David S. Miller
2005-06-03 23:26 ` Lennert Buytenhek
2005-06-05 20:11 ` David S. Miller
2005-06-03 21:07 ` Edgar E Iglesias
2005-06-03 23:30 ` Lennert Buytenhek
2005-06-03 20:30 ` Ben Greear
2005-06-03 19:40 ` jamal
2005-06-03 20:23 ` jamal
2005-06-03 20:28 ` Mitch Williams
2005-06-02 21:19 Ronciak, John
2005-06-02 21:31 ` Stephen Hemminger
2005-06-02 21:40 ` David S. Miller
2005-06-02 21:51 ` Jon Mason
2005-06-02 22:12 ` David S. Miller
2005-06-02 22:19 ` Jon Mason
2005-06-02 22:15 ` Robert Olsson
2005-05-26 21:36 Mitch Williams
2005-05-27 8:21 ` Robert Olsson
2005-05-27 11:18 ` jamal
2005-05-27 15:50 ` Stephen Hemminger
2005-05-27 20:27 ` Mitch Williams
2005-05-27 21:01 ` Stephen Hemminger
2005-05-28 0:56 ` jamal
2005-05-31 17:35 ` Mitch Williams
2005-05-31 17:40 ` Stephen Hemminger
2005-05-31 17:43 ` Mitch Williams
2005-05-31 22:07 ` Jon Mason
2005-05-31 22:14 ` David S. Miller
2005-05-31 23:28 ` Jon Mason
2005-06-02 12:26 ` jamal
2005-06-02 17:30 ` Stephen Hemminger
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