From: mbizon@freebox.fr (Maxime Bizon)
To: linux-arm-kernel@lists.infradead.org
Subject: alignment faults in 3.6
Date: Thu, 11 Oct 2012 12:56:10 +0200 [thread overview]
Message-ID: <1349952970.1232.5.camel@sakura.staff.proxad.net> (raw)
In-Reply-To: <1349952574.21172.8604.camel@edumazet-glaptop>
On Thu, 2012-10-11 at 12:49 +0200, Eric Dumazet wrote:
> So if you have an alignment fault, thats because IP header is not
> aligned on 4 bytes ?
>
> If so a driver is buggy and must be fixed.
So a driver that does not align the ip header is buggy ?
I always thought it was ok not to do so (with a potential performance
penalty).
I have some MIPS hardware that is not able to DMA on anything but 32bits
aligned addresses (bcm63xx). I tried once to add a memcpy instead of
taking unaligned faults and the result was *much slower* on a ipv4
forwarding test (which is what the hardware is used for).
--
Maxime
next prev parent reply other threads:[~2012-10-11 10:56 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-04 23:10 alignment faults in 3.6 Rob Herring
2012-10-05 0:58 ` Michael Hope
2012-10-05 1:26 ` Mans Rullgard
2012-10-05 1:56 ` Rob Herring
2012-10-05 2:25 ` Mans Rullgard
2012-10-05 3:04 ` Rob Herring
2012-10-05 5:37 ` Khem Raj
2012-10-05 7:12 ` Russell King - ARM Linux
2012-10-05 8:20 ` Mans Rullgard
2012-10-05 8:24 ` Russell King - ARM Linux
2012-10-05 8:33 ` Mans Rullgard
2012-10-05 8:33 ` Russell King - ARM Linux
2012-10-05 8:37 ` Mans Rullgard
2012-10-05 8:50 ` Russell King - ARM Linux
2012-10-05 13:49 ` Mikael Pettersson
2012-10-05 12:24 ` Rob Herring
2012-10-05 13:51 ` Mikael Pettersson
2012-10-05 16:01 ` Rob Herring
2012-10-05 22:37 ` Mans Rullgard
2012-10-05 22:42 ` Russell King - ARM Linux
2012-10-06 1:41 ` Nicolas Pitre
2012-10-06 16:04 ` Mans Rullgard
2012-10-06 16:19 ` Nicolas Pitre
2012-10-06 16:31 ` Russell King - ARM Linux
2012-10-06 10:58 ` Mikael Pettersson
2012-10-09 14:05 ` Scott Bambrough
2012-10-09 14:18 ` Mans Rullgard
2012-10-05 14:05 ` Russell King - ARM Linux
2012-10-05 14:33 ` Rob Herring
2012-10-11 0:59 ` Jon Masters
2012-10-11 2:27 ` Måns Rullgård
2012-10-11 2:34 ` Jon Masters
2012-10-11 8:21 ` David Laight
2012-10-11 8:53 ` Russell King - ARM Linux
2012-10-11 9:45 ` Måns Rullgård
2012-10-11 10:00 ` Eric Dumazet
2012-10-11 10:20 ` Måns Rullgård
2012-10-11 10:22 ` Eric Dumazet
2012-10-11 10:32 ` Russell King - ARM Linux
2012-10-11 10:49 ` Eric Dumazet
2012-10-11 10:56 ` Maxime Bizon [this message]
2012-10-11 11:28 ` Eric Dumazet
2012-10-11 11:47 ` Maxime Bizon
2012-10-11 11:54 ` Eric Dumazet
2012-10-11 12:00 ` Eric Dumazet
2012-10-11 12:51 ` Maxime Bizon
2012-10-11 12:59 ` Eric Dumazet
2012-10-11 12:28 ` Arnd Bergmann
2012-10-11 12:40 ` Eric Dumazet
2012-10-11 13:20 ` Rob Herring
2012-10-11 13:32 ` Måns Rullgård
2012-10-11 13:35 ` Arnd Bergmann
2012-10-11 13:47 ` Eric Dumazet
2012-10-11 15:23 ` Rob Herring
2012-10-11 15:39 ` David Laight
2012-10-11 16:18 ` Måns Rullgård
2012-10-12 8:11 ` Arnd Bergmann
2012-10-12 9:03 ` Russell King - ARM Linux
2012-10-12 10:04 ` Eric Dumazet
2012-10-12 12:24 ` Russell King - ARM Linux
2012-10-12 11:00 ` Måns Rullgård
2012-10-12 11:07 ` Russell King - ARM Linux
2012-10-12 11:18 ` Måns Rullgård
2012-10-12 11:44 ` Russell King - ARM Linux
2012-10-12 12:08 ` Eric Dumazet
2012-10-12 14:22 ` Benjamin LaHaise
2012-10-12 14:36 ` David Laight
2012-10-12 14:48 ` Eric Dumazet
2012-10-12 15:00 ` Benjamin LaHaise
2012-10-12 15:04 ` Ben Hutchings
2012-10-12 15:47 ` David Laight
2012-10-12 16:13 ` Ben Hutchings
2012-10-12 12:16 ` Måns Rullgård
2012-10-12 11:19 ` Russell King - ARM Linux
2012-10-11 16:15 ` Eric Dumazet
2012-10-11 16:59 ` Catalin Marinas
2012-10-11 10:16 ` David Laight
2012-10-11 10:46 ` Måns Rullgård
2012-10-05 16:08 ` Rob Herring
2012-10-05 7:29 ` Russell King - ARM Linux
2012-10-05 10:51 ` Russell King - ARM Linux
2012-10-23 16:30 ` Jon Masters
2012-10-23 16:58 ` Russell King - ARM Linux
2012-10-23 17:15 ` Jon Masters
2012-10-23 19:14 ` Rob Herring
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