From: thockin@hockin.org
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Andi Kleen <ak@suse.de>, Alan Cox <alan@lxorguk.ukuu.org.uk>,
Gerd Knorr <kraxel@suse.de>, Linus Torvalds <torvalds@osdl.org>,
Dave Jones <davej@redhat.com>, Zachary Amsden <zach@vmware.com>,
Pavel Machek <pavel@ucw.cz>, Andrew Morton <akpm@osdl.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Zwane Mwaikambo <zwane@arm.linux.org.uk>,
Pratap Subrahmanyam <pratap@vmware.com>,
Christopher Li <chrisl@vmware.com>, Ingo Molnar <mingo@elte.hu>
Subject: Re: [patch] SMP alternatives
Date: Thu, 24 Nov 2005 11:16:36 -0800 [thread overview]
Message-ID: <20051124191636.GC2468@hockin.org> (raw)
In-Reply-To: <m1u0e2gnab.fsf@ebiederm.dsl.xmission.com>
On Thu, Nov 24, 2005 at 06:58:52AM -0700, Eric W. Biederman wrote:
> > That's supposed to be done by hardware, no?
> > At least the K8 has a hardware scrubber (although it's not always enabled)
>
> Recent good implementations like the Opteron will do it for you.
> Older or cheaper memory controllers will not.
Beware of errata - there's at leats one errata on Opteron which forces you
to choose between x4 (chipkill) ECC and scrubber. One or the other, but
not both. There are plenty of errata on the scrubber alone. Worse, if my
(brain)memory is correct, without the scrubber, correctable errors are
corrected on the fly, but never written back to DRAM.
> Having an architecturally sane software scrubber as backup for
> the hardware implementations is nice, and except in the cases
> where someone disables the lock prefix it is takes very little
> code on x86.
>
> Even on the Opteron you could theoretically have the case of a brain-dead
> external memory controller, although that is not likely.
next prev parent reply other threads:[~2005-11-24 19:14 UTC|newest]
Thread overview: 163+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-10 0:32 [PATCH 1/10] Cr4 is valid on some 486s Zachary Amsden
2005-11-11 10:36 ` Pavel Machek
2005-11-11 17:49 ` H. Peter Anvin
2005-11-11 18:00 ` Maciej W. Rozycki
2005-11-11 19:36 ` Zachary Amsden
2005-11-11 19:58 ` Linus Torvalds
2005-11-11 20:14 ` Zachary Amsden
2005-11-11 20:22 ` Linus Torvalds
2005-11-13 7:42 ` Dave Jones
2005-11-13 10:59 ` Andi Kleen
2005-11-13 17:26 ` Alan Cox
2005-11-13 17:09 ` Eric W. Biederman
2005-11-13 19:00 ` Andi Kleen
2005-11-13 19:07 ` Eric W. Biederman
2005-11-13 19:41 ` Alan Cox
2005-11-13 19:36 ` Linus Torvalds
2005-11-13 21:32 ` Alan Cox
2005-11-14 7:46 ` Arjan van de Ven
2005-11-13 19:56 ` H. Peter Anvin
2005-11-13 19:24 ` Linus Torvalds
2005-11-13 20:29 ` Linus Torvalds
2005-11-14 15:06 ` Gerd Knorr
2005-11-14 19:25 ` Linus Torvalds
2005-11-14 19:46 ` Zachary Amsden
2005-11-14 19:52 ` Arjan van de Ven
2005-11-14 20:34 ` Zachary Amsden
2005-11-14 20:52 ` Arjan van de Ven
2005-11-15 14:12 ` Gerd Knorr
2005-11-15 16:01 ` Gerd Knorr
2005-11-15 16:04 ` Zachary Amsden
2005-11-15 16:06 ` Arjan van de Ven
2005-11-15 16:10 ` Dave Jones
2005-11-15 16:14 ` H. Peter Anvin
2005-11-15 16:19 ` Dave Jones
2005-11-15 16:25 ` Arjan van de Ven
2005-11-15 16:34 ` Zachary Amsden
2005-11-15 16:28 ` H. Peter Anvin
2005-11-15 16:24 ` Zachary Amsden
2005-11-15 16:52 ` Linus Torvalds
2005-11-15 16:16 ` Gerd Knorr
2005-11-15 16:08 ` Roland Dreier
2005-11-16 9:58 ` Gerd Knorr
2005-11-15 16:12 ` Linus Torvalds
2005-11-15 16:16 ` Dave Jones
2005-11-15 16:27 ` Gerd Knorr
2005-11-16 16:12 ` [RFC] SMP alternatives Gerd Knorr
2005-11-22 17:48 ` [patch] " Gerd Knorr
2005-11-22 18:01 ` Pavel Machek
2005-11-23 15:12 ` Vincent Hanquez
2005-11-23 19:17 ` Andi Kleen
2005-11-23 15:29 ` Gerd Knorr
2005-11-23 16:42 ` Alan Cox
2005-11-23 16:39 ` Andi Kleen
2005-11-23 17:21 ` Alan Cox
2005-11-23 16:59 ` Andi Kleen
2005-11-23 22:00 ` Alan Cox
2005-11-24 13:13 ` Andi Kleen
2005-11-24 13:30 ` Eric W. Biederman
2005-11-24 13:39 ` Andi Kleen
2005-11-24 13:58 ` Eric W. Biederman
2005-11-24 19:16 ` thockin [this message]
2005-11-24 19:26 ` Andi Kleen
2005-11-24 14:34 ` Alan Cox
2005-11-24 14:22 ` Andi Kleen
2005-11-24 15:15 ` Alan Cox
2005-11-24 14:55 ` Andi Kleen
2005-11-24 15:09 ` Eric W. Biederman
2005-11-24 15:36 ` Andi Kleen
2005-11-24 16:49 ` Eric W. Biederman
2005-11-24 19:12 ` thockin
2005-11-24 19:14 ` Andi Kleen
2005-11-24 19:24 ` thockin
2005-11-24 19:29 ` Andi Kleen
2005-11-24 19:44 ` thockin
2005-11-24 21:20 ` Andi Kleen
2005-11-24 21:40 ` thockin
2005-11-24 23:33 ` Eric W. Biederman
2005-11-24 23:12 ` Alan Cox
2005-11-24 22:48 ` thockin
2005-11-24 23:35 ` Andi Kleen
2005-11-25 0:13 ` Alan Cox
2005-11-25 1:33 ` H. Peter Anvin
2005-11-28 19:15 ` Bill Davidsen
2005-11-24 16:02 ` Alan Cox
2005-11-24 19:09 ` thockin
2005-11-24 14:30 ` Alan Cox
2005-11-23 17:02 ` Linus Torvalds
2005-11-23 18:02 ` H. Peter Anvin
2005-11-23 18:42 ` Linus Torvalds
2005-11-23 17:26 ` Jeff V. Merkey
2005-11-23 19:03 ` Linus Torvalds
2005-11-23 19:31 ` jmerkey
2005-11-23 18:46 ` Andi Kleen
2005-11-23 19:12 ` H. Peter Anvin
2005-11-23 19:30 ` jmerkey
2005-11-23 21:44 ` Alan Cox
2005-11-23 21:13 ` Andi Kleen
2005-11-23 21:46 ` Jeff Garzik
2005-11-23 22:23 ` Andi Kleen
2005-11-23 22:30 ` Pavel Machek
2005-11-23 22:05 ` Alan Cox
2005-11-23 21:36 ` Arjan van de Ven
2005-11-23 21:36 ` Andi Kleen
2005-11-23 22:13 ` Linus Torvalds
2005-11-23 21:36 ` Linus Torvalds
2005-11-23 21:43 ` Andi Kleen
2005-11-23 22:15 ` Linus Torvalds
2005-11-23 22:22 ` Andi Kleen
2005-11-23 22:25 ` H. Peter Anvin
2005-11-23 22:32 ` Andi Kleen
2005-11-23 22:36 ` H. Peter Anvin
2005-11-23 22:40 ` Andi Kleen
2005-11-23 22:52 ` H. Peter Anvin
2005-11-23 23:10 ` Linus Torvalds
2005-11-24 0:55 ` Jeff Garzik
2005-11-23 21:48 ` Daniel Jacobowitz
2005-11-23 21:53 ` H. Peter Anvin
2005-11-23 22:03 ` Daniel Jacobowitz
2005-11-23 22:09 ` H. Peter Anvin
2005-11-23 22:21 ` Linus Torvalds
2005-11-23 23:29 ` Eric W. Biederman
2005-11-23 23:40 ` Linus Torvalds
2005-11-23 22:19 ` Linus Torvalds
2005-11-23 22:20 ` Daniel Jacobowitz
2005-11-23 23:08 ` Linus Torvalds
2005-11-23 23:02 ` Jeff V. Merkey
2005-11-23 23:42 ` Daniel Jacobowitz
2005-11-23 23:59 ` Linus Torvalds
2005-11-24 2:06 ` Daniel Jacobowitz
2005-11-24 22:32 ` Ulrich Drepper
2005-11-28 19:58 ` Bill Davidsen
2005-11-24 1:02 ` Jeff Garzik
2005-11-24 13:01 ` Pádraig Brady
2005-11-24 13:12 ` Arjan van de Ven
2005-11-28 19:52 ` Bill Davidsen
2005-11-28 20:05 ` Zachary Amsden
2005-11-28 22:19 ` Jeff V. Merkey
2005-11-28 23:00 ` Zachary Amsden
2005-11-28 23:07 ` H. Peter Anvin
2005-11-28 23:30 ` Zachary Amsden
2005-11-28 23:32 ` H. Peter Anvin
2005-11-28 23:12 ` Andi Kleen
2005-11-23 22:50 ` Alan Cox
2005-11-23 22:22 ` H. Peter Anvin
2005-11-25 7:38 ` Chris Wedgwood
2005-11-25 17:33 ` Linus Torvalds
2005-11-28 20:25 ` Bill Davidsen
2005-11-25 20:13 ` H. Peter Anvin
2005-11-24 3:23 ` Mikulas Patocka
2005-11-24 3:31 ` Mikulas Patocka
2005-11-24 3:55 ` H. Peter Anvin
2005-11-24 22:30 ` Ulrich Drepper
2005-11-23 16:43 ` Gerd Knorr
2005-11-23 16:51 ` H. Peter Anvin
-- strict thread matches above, loose matches on Subject: below --
2005-11-24 17:48 linux
2005-11-24 18:48 ` Linus Torvalds
2005-11-24 18:24 colin
2006-01-24 15:33 [PATCH] " Gerd Hoffmann
2006-01-24 16:22 ` Ben Collins
2006-01-25 9:20 ` Gerd Hoffmann
2006-01-26 10:22 ` Pavel Machek
2006-01-26 11:17 ` Gerd Hoffmann
2006-01-26 11:48 ` Pavel Machek
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