From: Grant Grundler <iod00d@hp.com>
To: linux-ia64@vger.kernel.org
Subject: Re: NS83820 2.6.0-test5 driver seems unstable on IA64
Date: Tue, 23 Sep 2003 20:38:19 +0000 [thread overview]
Message-ID: <marc-linux-ia64-106435005618770@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-106394503001622@msgid-missing>
On Tue, Sep 23, 2003 at 11:51:22AM -0700, David S. Miller wrote:
> > Even x86 pays at least a one cycle penalty for every misaligned access.
>
> Yes, one cycle, and it's completely lost in the noise when it happens.
Depends on the app - for the networking stack, I agree.
To revisit Ben's comment: if we know something is likely to be misaligned,
a RISC processor can efficiently load both parts and merge them (one cycle
penalty vs a regular aligned load). Given misaligned accesses are infrequent
enough to affect performance, it makes sense to do this in SW because
it reduces cost of the HW design/test/mfg cycles.
...
> It is an unavoidable axoim in the kernel networking. Unaligned accesses
> will happen, and they aren't a bug and therefore not worthy of mention
> in the kernel logs any more than "page was freed" :-)
Ok. If the kernel networking stack used get_unaligned() in the one place
Peter originally found, x86/sparc64?/et al wouldn't see a difference.
It would avoid traps on ia64 and parisc. Bad idea?
Any other arches it might help/hurt on?
grant
next prev parent reply other threads:[~2003-09-23 20:38 UTC|newest]
Thread overview: 148+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-19 4:16 NS83820 2.6.0-test5 driver seems unstable on IA64 Peter Chubb
2003-09-19 4:38 ` Grant Grundler
2003-09-19 4:43 ` Andi Kleen
2003-09-19 5:01 ` Peter Chubb
2003-09-19 5:04 ` Grant Grundler
2003-09-19 5:11 ` Peter Chubb
2003-09-19 5:53 ` Andi Kleen
2003-09-19 10:49 ` Benjamin LaHaise
2003-09-23 0:34 ` Peter Chubb
2003-09-23 0:36 ` Benjamin LaHaise
2003-09-23 6:22 ` David S. Miller
2003-09-23 10:40 ` Peter Chubb
2003-09-23 10:51 ` David S. Miller
2003-09-23 14:59 ` David Mosberger
2003-09-23 17:27 ` David S. Miller
2003-09-23 17:56 ` David Mosberger
2003-09-23 17:56 ` David Mosberger
2003-09-23 17:57 ` David S. Miller
2003-09-23 17:58 ` Van Maren, Kevin
2003-09-23 18:06 ` David Mosberger
2003-09-23 18:21 ` Luck, Tony
2003-09-23 18:27 ` David Mosberger
2003-09-23 18:29 ` Benjamin LaHaise
2003-09-23 18:45 ` David S. Miller
2003-09-23 18:47 ` David S. Miller
2003-09-23 18:51 ` Grant Grundler
2003-09-23 18:51 ` David S. Miller
2003-09-23 18:52 ` David S. Miller
2003-09-23 18:54 ` Andreas Schwab
2003-09-23 19:01 ` David S. Miller
2003-09-23 19:04 ` Benjamin LaHaise
2003-09-23 19:08 ` David S. Miller
2003-09-23 19:09 ` Andreas Schwab
2003-09-23 19:10 ` Jeff Garzik
2003-09-23 19:10 ` David S. Miller
2003-09-23 19:11 ` David S. Miller
2003-09-23 19:11 ` Benjamin LaHaise
2003-09-23 19:16 ` Andreas Schwab
2003-09-23 19:17 ` David Mosberger
2003-09-23 19:22 ` David S. Miller
2003-09-23 19:22 ` Jeff Garzik
2003-09-23 19:28 ` Matthew Wilcox
2003-09-23 20:00 ` David Mosberger
2003-09-23 20:00 ` David Mosberger
2003-09-23 20:38 ` Grant Grundler [this message]
2003-09-23 20:45 ` David S. Miller
2003-09-23 21:00 ` Alan Cox
2003-09-23 21:16 ` David Mosberger
2003-09-23 22:35 ` Grant Grundler
2003-09-23 22:58 ` Luck, Tony
2003-09-23 23:04 ` Ian Wienand
2003-09-23 23:15 ` Andrew Morton
2003-09-23 23:32 ` David S. Miller
2003-09-23 23:35 ` David S. Miller
2003-09-23 23:35 ` David S. Miller
2003-09-23 23:37 ` David S. Miller
2003-09-24 0:04 ` David S. Miller
2003-09-24 0:06 ` David S. Miller
2003-09-24 0:13 ` Grant Grundler
2003-09-24 0:14 ` Matthew Wilcox
2003-09-24 1:47 ` David S. Miller
2003-09-24 1:58 ` William Lee Irwin III
2003-09-24 2:55 ` David S. Miller
2003-09-24 3:08 ` David S. Miller
2003-09-24 5:18 ` Valdis.Kletnieks
2003-09-25 16:11 ` Ivan Kokshaysky
2003-09-26 1:12 ` David S. Miller
[not found] <A4gy.8wi.13@gated-at.bofh.it>
[not found] ` <A4gy.8wi.15@gated-at.bofh.it>
[not found] ` <A4gy.8wi.17@gated-at.bofh.it>
[not found] ` <A4gy.8wi.11@gated-at.bofh.it>
[not found] ` <A4Tv.Ud.37@gated-at.bofh.it>
[not found] ` <AepM.5Zb.41@gated-at.bofh.it>
2003-09-27 4:26 ` Andi Kleen
2003-09-27 4:34 ` David Mosberger
2003-09-27 23:36 ` David S. Miller
[not found] <A2yd.64p.31@gated-at.bofh.it>
[not found] ` <A2yd.64p.29@gated-at.bofh.it>
[not found] ` <A317.6GH.7@gated-at.bofh.it>
2003-09-26 17:04 ` Andi Kleen
2003-09-26 17:22 ` Chris Friesen
2003-09-26 17:47 ` David Mosberger
2003-09-27 3:57 ` David S. Miller
2003-09-27 4:36 ` Andi Kleen
2003-09-27 4:52 ` David Mosberger
[not found] <zU7D.2Ji.27@gated-at.bofh.it>
2003-09-26 15:14 ` Andi Kleen
2003-09-26 15:41 ` David Mosberger
-- strict thread matches above, loose matches on Subject: below --
2003-09-26 6:16 Manfred Spraul
2003-09-26 6:07 ` David S. Miller
2003-09-26 6:41 ` David Mosberger
2003-09-26 14:38 ` Ivan Kokshaysky
2003-09-27 3:12 ` David S. Miller
2003-09-23 22:58 Luck, Tony
2003-09-23 23:32 ` David S. Miller
2003-09-24 5:18 ` Valdis.Kletnieks
2003-09-23 18:21 Luck, Tony
2003-09-23 18:29 ` Benjamin LaHaise
2003-09-23 18:45 ` David S. Miller
2003-09-23 18:51 ` Grant Grundler
2003-09-23 18:51 ` David S. Miller
2003-09-23 20:38 ` Grant Grundler
2003-09-23 20:45 ` David S. Miller
2003-09-23 22:35 ` Grant Grundler
2003-09-23 23:35 ` David S. Miller
2003-09-24 0:13 ` Grant Grundler
2003-09-24 0:04 ` David S. Miller
2003-09-24 1:58 ` William Lee Irwin III
2003-09-23 19:04 ` Benjamin LaHaise
2003-09-23 18:54 ` Andreas Schwab
2003-09-23 18:52 ` David S. Miller
2003-09-23 19:09 ` Andreas Schwab
2003-09-23 19:01 ` David S. Miller
2003-09-23 19:16 ` Andreas Schwab
2003-09-23 19:08 ` David S. Miller
2003-09-23 19:28 ` Matthew Wilcox
2003-09-23 19:22 ` David S. Miller
2003-09-23 23:15 ` Andrew Morton
2003-09-23 23:37 ` David S. Miller
2003-09-24 0:14 ` Matthew Wilcox
2003-09-24 0:06 ` David S. Miller
2003-09-23 19:10 ` Jeff Garzik
2003-09-23 19:11 ` Benjamin LaHaise
2003-09-23 19:22 ` Jeff Garzik
2003-09-23 21:00 ` Alan Cox
2003-09-23 21:16 ` David Mosberger
2003-09-24 1:47 ` David S. Miller
2003-09-23 17:58 Van Maren, Kevin
2003-09-23 17:57 ` David S. Miller
2003-09-23 18:27 ` David Mosberger
2003-09-23 18:47 ` David S. Miller
2003-09-23 19:17 ` David Mosberger
2003-09-23 19:10 ` David S. Miller
2003-09-23 20:00 ` David Mosberger
2003-09-24 3:08 ` David S. Miller
2003-09-25 16:11 ` Ivan Kokshaysky
2003-09-26 1:12 ` David S. Miller
2003-09-23 18:06 ` David Mosberger
2003-09-23 19:11 ` David S. Miller
2003-09-19 4:16 Peter Chubb
2003-09-19 4:38 ` Grant Grundler
2003-09-19 4:43 ` Andi Kleen
2003-09-19 5:01 ` Peter Chubb
2003-09-19 5:53 ` Andi Kleen
2003-09-19 10:49 ` Benjamin LaHaise
2003-09-23 0:34 ` Peter Chubb
2003-09-23 0:36 ` Benjamin LaHaise
2003-09-23 6:22 ` David S. Miller
2003-09-23 10:40 ` Peter Chubb
2003-09-23 10:51 ` David S. Miller
2003-09-23 14:59 ` David Mosberger
2003-09-23 17:27 ` David S. Miller
2003-09-23 17:56 ` David Mosberger
2003-09-24 2:55 ` David S. Miller
2003-09-23 23:04 ` Ian Wienand
2003-09-23 23:35 ` David S. Miller
2003-09-19 5:04 ` Grant Grundler
2003-09-19 5:11 ` Peter Chubb
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