From: Andi Kleen <ak@suse.de>
To: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Andi Kleen <ak@suse.de>,
patches@x86-64.org, Jeremy Fitzhardinge <jeremy@goop.org>,
Zachary Amsden <zach@vmware.com>,
Rusty Russell <rusty@rustcorp.com.au>,
linux-kernel@vger.kernel.org,
"S. P. Prasanna" <prasanna@in.ibm.com>,
Chris Wright <chrisw@sous-sol.org>
Subject: Re: Non atomic unaligned writes
Date: Mon, 20 Aug 2007 12:23:07 +0200 [thread overview]
Message-ID: <20070820102306.GG16680@bingen.suse.de> (raw)
In-Reply-To: <20070820005522.GA5069@Krystal>
> Intel486???, Pentium??, or P6 family processors. The P6 family processors
> provide bus control signals that permit external memory subsystems to
> make split accesses atomic; however, nonaligned data accesses will
Normally in standard SMP systems between CPUs they are atomic AFAIK
(modulo bugs)
You're right -- i'm not sure about P5 SMP.
> seriously impact the performance of the processor and should be avoided
> where possible.
But they're also slow yes.
-Andi
next prev parent reply other threads:[~2007-08-20 9:29 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-19 9:05 new text patching for review Andi Kleen
2007-07-19 13:38 ` Mathieu Desnoyers
2007-07-19 13:46 ` Andi Kleen
2007-07-19 17:35 ` Mathieu Desnoyers
2007-07-19 21:14 ` Andi Kleen
2007-07-19 20:30 ` Jeremy Fitzhardinge
2007-07-19 20:46 ` [patches] " Andi Kleen
2007-07-19 20:51 ` Jeremy Fitzhardinge
2007-07-19 21:06 ` Andi Kleen
2007-07-19 21:08 ` Jeremy Fitzhardinge
2007-07-19 23:53 ` Mathieu Desnoyers
2007-08-20 0:55 ` Non atomic unaligned writes Mathieu Desnoyers
2007-08-20 5:03 ` Arjan van de Ven
2007-08-20 10:23 ` Andi Kleen [this message]
2007-07-19 23:51 ` new text patching for review Mathieu Desnoyers
2007-07-19 23:49 ` Mathieu Desnoyers
2007-07-20 1:15 ` Zachary Amsden
2007-07-20 7:37 ` Andi Kleen
2007-07-20 15:17 ` Mathieu Desnoyers
2007-07-21 6:19 ` Andi Kleen
2007-07-20 8:28 ` Andi Kleen
2007-07-20 14:36 ` Mathieu Desnoyers
2007-07-20 0:37 ` Zachary Amsden
2007-07-20 8:23 ` Andi Kleen
2007-08-10 19:00 ` Mathieu Desnoyers
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