From: "H. Peter Anvin" <hpa@zytor.com>
To: Dave Jones <davej@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Andy Whitcroft <apw@shadowen.org>,
"H. Peter Anvin" <hpa@zytor.com>, Steve Fox <drfickle@us.ibm.com>,
Mel Gorman <mel@csn.ul.ie>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] move the kernel to 16MB for NUMA-Q
Date: Mon, 11 Jun 2007 10:36:45 -0700 [thread overview]
Message-ID: <466D882D.70001@zytor.com> (raw)
In-Reply-To: <20070611172006.GI9174@redhat.com>
Dave Jones wrote:
>
> FWIW, waay back when (sometime last year if memory serves)
> Linus suggested changing the default to 0x1000000 for all x86.
> The reasoning was some performance microoptimisation regarding
> 4MB aligned TLBs iirc.
>
> The details have long since evaded my memory, but as an experiment,
> I made the change to the Fedora kernel. FC5,FC6 and F7 have been
> this way for a while now, with no obvious problems. Ditto RHEL5.
> We did get some performance numbers at the time of the change,
> but they weren't amazing (basically in the noise).
> Given it never seemed to actually get worse, I never got around
> to reverting it..
>
Picking the 16 MB base is a bit obnoxious on small-memory machines, 4 MB
would probably be a more reasonable base. Of course, 16 MB would avoid
the issue of the handful of machines with memory holes at 15-16 MB.
-hpa
next prev parent reply other threads:[~2007-06-11 17:37 UTC|newest]
Thread overview: 143+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-16 3:19 2.6.22-rc1-mm1 Andrew Morton
2007-05-16 6:06 ` 2.6.22-rc1-mm1 KAMEZAWA Hiroyuki
2007-05-16 7:58 ` 2.6.22-rc1-mm1 Jeff Garzik
2007-05-16 8:04 ` 2.6.22-rc1-mm1 Andrew Morton
2007-05-16 15:33 ` 2.6.22-rc1-mm1 Jeff Garzik
2007-05-16 20:24 ` 2.6.22-rc1-mm1 Darrick J. Wong
2007-05-16 16:54 ` 2.6.22-rc1-mm1 Randy Dunlap
2007-05-16 7:57 ` 2.6.22-rc1-mm1 - s390 vs. md Cornelia Huck
2007-05-16 17:21 ` Williams, Dan J
2007-05-16 10:18 ` 2.6.22-rc1-mm1 Andy Whitcroft
2007-05-16 15:16 ` 2.6.22-rc1-mm1 H. Peter Anvin
2007-05-16 17:40 ` 2.6.22-rc1-mm1 Mel Gorman
2007-05-16 17:55 ` 2.6.22-rc1-mm1 H. Peter Anvin
2007-05-16 18:18 ` 2.6.22-rc1-mm1 Andy Whitcroft
2007-05-16 18:00 ` 2.6.22-rc1-mm1 Andrew Morton
2007-05-16 23:32 ` 2.6.22-rc1-mm1 H. Peter Anvin
2007-05-16 23:36 ` 2.6.22-rc1-mm1 H. Peter Anvin
2007-05-17 9:35 ` 2.6.22-rc1-mm1 Mel Gorman
2007-05-29 22:34 ` 2.6.22-rc1-mm1 Andy Whitcroft
2007-06-01 9:50 ` 2.6.22-rc1-mm1 Andy Whitcroft
2007-06-01 23:12 ` 2.6.22-rc1-mm1 H. Peter Anvin
2007-06-05 18:38 ` 2.6.22-rc1-mm1 Andy Whitcroft
2007-06-05 22:57 ` 2.6.22-rc1-mm1 H. Peter Anvin
2007-06-07 9:49 ` 2.6.22-rc1-mm1 Andy Whitcroft
2007-06-11 13:58 ` 2.6.22-rc1-mm1 Andy Whitcroft
[not found] ` <63a08cc7547f14065becdf9a94d0d529@pinky>
2007-06-11 16:15 ` [PATCH] move the kernel to 16MB for NUMA-Q Andrew Morton
2007-06-11 17:20 ` Dave Jones
2007-06-11 17:36 ` H. Peter Anvin [this message]
2007-06-11 18:19 ` Jan Engelhardt
2007-06-11 18:46 ` Dave Jones
2007-06-11 19:17 ` Alan Cox
2007-06-11 20:07 ` Rene Herman
2007-06-11 20:21 ` Rene Herman
2007-06-11 19:01 ` H. Peter Anvin
2007-06-11 20:44 ` Jan Engelhardt
2007-06-11 20:51 ` H. Peter Anvin
2007-06-15 11:12 ` Jan Engelhardt
2007-06-11 17:49 ` Rene Herman
2007-06-11 17:58 ` H. Peter Anvin
2007-06-11 18:01 ` Rene Herman
2007-05-17 4:16 ` 2.6.22-rc1-mm1 Bharata B Rao
2007-05-18 8:54 ` 2.6.22-rc1-mm1 young dave
2007-05-18 10:07 ` 2.6.22-rc1-mm1 young dave
2007-05-18 16:54 ` 2.6.22-rc1-mm1 H. Peter Anvin
2007-05-18 16:59 ` 2.6.22-rc1-mm1 Mel Gorman
2007-05-21 0:53 ` 2.6.22-rc1-mm1 young dave
2007-05-21 4:49 ` 2.6.22-rc1-mm1 H. Peter Anvin
2007-05-21 5:00 ` 2.6.22-rc1-mm1 young dave
2007-05-21 5:03 ` 2.6.22-rc1-mm1 H. Peter Anvin
2007-05-21 5:39 ` 2.6.22-rc1-mm1 young dave
[not found] ` <465138CC.3060605@zytor.com>
2007-05-21 8:41 ` 2.6.22-rc1-mm1 young dave
2007-05-21 16:35 ` 2.6.22-rc1-mm1 H. Peter Anvin
2007-05-22 2:14 ` 2.6.22-rc1-mm1 young dave
[not found] ` <465319C1.2080206@zytor.com>
2007-05-23 1:15 ` 2.6.22-rc1-mm1 young dave
2007-05-16 12:10 ` (NFS) BUG: at page-writeback.c:829 [Was: 2.6.22-rc1-mm1] Jiri Slaby
2007-05-16 12:39 ` Nick Piggin
2007-05-16 12:44 ` Jiri Slaby
2007-05-16 12:47 ` Nick Piggin
2007-05-16 13:00 ` Trond Myklebust
2007-05-16 13:06 ` Nick Piggin
2007-05-16 12:52 ` Trond Myklebust
2007-05-16 14:30 ` 2.6.22-rc1-mm1 Michal Piotrowski
2007-05-16 14:37 ` 2.6.22-rc1-mm1 Nick Piggin
[not found] ` <6bffcb0e0705160935r1767a764hce72f24f9eee6c1e@mail.gmail.com>
2007-05-16 16:58 ` 2.6.22-rc1-mm1 Jiri Slaby
2007-05-16 15:34 ` 2.6.22-rc1-mm1 Gabriel C
2007-05-16 16:24 ` 2.6.22-rc1-mm1 Michal Piotrowski
2007-05-16 16:41 ` 2.6.22-rc1-mm1 Andrew Morton
2007-05-17 2:06 ` 2.6.22-rc1-mm1 David Chinner
2007-05-17 8:41 ` [xfs-masters] 2.6.22-rc1-mm1 Christoph Hellwig
2007-05-17 20:05 ` Michal Piotrowski
2007-05-18 2:11 ` David Chinner
2007-05-21 10:11 ` David Chinner
2007-05-21 10:23 ` Christoph Hellwig
2007-05-22 10:44 ` David Chinner
2007-05-22 11:42 ` Christoph Hellwig
2007-05-22 23:23 ` Nathan Scott
2007-05-22 14:45 ` Michal Piotrowski
2007-05-16 16:50 ` 2.6.22-rc1-mm1 Randy Dunlap
2007-05-16 17:00 ` 2.6.22-rc1-mm1 Richard Purdie
2007-05-16 17:06 ` 2.6.22-rc1-mm1 Andrew Morton
2007-05-16 19:55 ` 2.6.22-rc1-mm1 Richard Purdie
2007-05-16 20:00 ` 2.6.22-rc1-mm1 Richard Purdie
2007-05-18 17:34 ` 2.6.22-rc1-mm1 Edward Shishkin
2007-05-16 17:37 ` 2.6.22-rc1-mm1 [cannot change thermal trip points] Maciej Rutecki
2007-05-16 17:47 ` Chuck Ebbert
2007-05-16 18:10 ` Goulven Guillard
2007-05-17 9:23 ` Pavel Machek
2007-05-17 13:36 ` Maciej Rutecki
2007-05-17 19:08 ` Len Brown
2007-05-17 20:09 ` Maciej Rutecki
2007-05-17 20:42 ` Maciej Rutecki
2007-05-17 21:53 ` Pavel Machek
2007-05-17 22:42 ` Len Brown
2007-05-21 12:11 ` Pavel Machek
2007-06-01 2:46 ` Len Brown
2007-06-04 11:16 ` Pavel Machek
2007-05-17 19:17 ` Len Brown
2007-05-17 21:52 ` Pavel Machek
2007-05-17 22:35 ` Len Brown
2007-06-04 9:02 ` Stefan Seyfried
2007-06-04 11:06 ` Pavel Machek
2007-05-19 19:56 ` Thomas Renninger
2007-05-21 3:50 ` Len Brown
2007-05-21 11:31 ` Thomas Renninger
2007-05-21 12:10 ` Pavel Machek
2007-05-21 13:27 ` Matthew Garrett
2007-05-21 13:29 ` Pavel Machek
2007-05-21 13:36 ` Matthew Garrett
2007-05-21 13:40 ` Pavel Machek
2007-05-21 13:45 ` Matthew Garrett
2007-05-21 22:42 ` Pavel Machek
2007-05-22 0:31 ` Matthew Garrett
2007-05-22 9:06 ` Pavel Machek
2007-05-22 9:16 ` Matthew Garrett
2007-05-22 9:28 ` Goulven Guillard
2007-05-22 10:05 ` Maciej Rutecki
2007-06-04 9:13 ` Stefan Seyfried
2007-05-24 14:16 ` 2.6.22-rc1-mm1 Implementing fan/thermal control in userspace - Was: " Thomas Renninger
2007-05-24 14:36 ` Matthew Garrett
2007-05-24 18:18 ` Thomas Renninger
2007-05-25 6:38 ` Pavel Machek
2007-05-27 21:51 ` Matthew Garrett
2007-05-28 10:58 ` Pavel Machek
2007-05-28 12:50 ` Matthew Garrett
2007-05-28 12:53 ` Pavel Machek
2007-05-16 18:55 ` 2.6.22-rc1-mm1: IDE compile error Adrian Bunk
2007-05-23 23:45 ` Bartlomiej Zolnierkiewicz
2007-05-24 10:55 ` Alan Cox
2007-05-24 18:53 ` H. Peter Anvin
2007-05-25 0:05 ` H. Peter Anvin
2007-05-25 0:14 ` Alan Cox
2007-05-25 0:18 ` H. Peter Anvin
2007-05-25 0:38 ` Alan Cox
2007-05-25 0:51 ` H. Peter Anvin
2007-05-25 14:19 ` Alan Cox
2007-05-17 12:38 ` 2.6.22-rc1-mm1 - Call trace in slub_def.h Reuben Farrelly
2007-05-17 12:52 ` Satyam Sharma
2007-05-20 10:12 ` 2.6.22-rc1-mm1 Mariusz Kozlowski
2007-05-20 10:21 ` 2.6.22-rc1-mm1 Sam Ravnborg
2007-05-20 15:33 ` 2.6.22-rc1-mm1 Kumar Gala
2007-05-22 7:25 ` 2.6.22-rc1-mm1: evm BUG when reading sysfs file Joseph Fannin
2007-05-22 21:23 ` Andrew Morton
2007-05-25 21:05 ` Mimi Zohar
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