From: William Lee Irwin III <wli@holomorphy.com>
To: Andrew Morton <akpm@digeo.com>
Cc: Andrea Arcangeli <andrea@suse.de>,
Norman Gaywood <norm@turing.une.edu.au>,
linux-kernel@vger.kernel.org
Subject: Re: Maybe a VM bug in 2.4.18-18 from RH 8.0?
Date: Fri, 6 Dec 2002 16:21:33 -0800 [thread overview]
Message-ID: <20021207002133.GT9882@holomorphy.com> (raw)
In-Reply-To: <3DF13A54.927C04C1@digeo.com>
> William Lee Irwin III wrote:
> >
> > ...
> > A 16KB or 64KB kernel allocation unit would then annihilate
>
On Fri, Dec 06, 2002 at 04:01:24PM -0800, Andrew Morton wrote:
> You want to be careful about this:
> CPU: L1 I cache: 16K, L1 D cache: 16K
> Because instantiating a 16k page into user pagetables in
> one hit means that it must all be zeroed. With these large
> pagesizes that means that the application is likely to get
> 100% L1 misses against the new page, whereas it currently
> gets 100% hits.
16K is reasonable; after that one might as well go all the way.
About the only way to cope is amortizing it by cacheing zeroed pages,
and that has other downsides.
Bill
next prev parent reply other threads:[~2002-12-07 0:14 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-06 0:13 Maybe a VM bug in 2.4.18-18 from RH 8.0? Norman Gaywood
2002-12-06 1:00 ` Andrew Morton
2002-12-06 1:17 ` Andrea Arcangeli
2002-12-06 1:34 ` Andrew Morton
2002-12-06 1:44 ` Andrea Arcangeli
2002-12-06 2:15 ` William Lee Irwin III
2002-12-06 2:28 ` Andrea Arcangeli
2002-12-06 2:41 ` William Lee Irwin III
2002-12-06 5:25 ` Andrew Morton
2002-12-06 5:48 ` Andrea Arcangeli
2002-12-06 6:14 ` William Lee Irwin III
2002-12-06 6:55 ` Andrew Morton
2002-12-06 7:14 ` GrandMasterLee
2002-12-06 7:25 ` Andrew Morton
2002-12-06 7:34 ` GrandMasterLee
2002-12-06 7:51 ` Andrew Morton
2002-12-06 11:37 ` Christoph Hellwig
2002-12-06 16:19 ` GrandMasterLee
2002-12-06 14:57 ` Andrea Arcangeli
2002-12-06 15:12 ` William Lee Irwin III
2002-12-06 23:32 ` Andrea Arcangeli
2002-12-06 23:45 ` William Lee Irwin III
2002-12-06 23:57 ` Andrea Arcangeli
2002-12-06 6:00 ` William Lee Irwin III
2002-12-06 22:28 ` Andrea Arcangeli
2002-12-06 23:21 ` William Lee Irwin III
2002-12-06 23:50 ` Andrea Arcangeli
2002-12-07 0:30 ` William Lee Irwin III
2002-12-07 0:01 ` Andrew Morton
2002-12-07 0:21 ` William Lee Irwin III [this message]
2002-12-07 0:30 ` Andrew Morton
2002-12-07 2:19 ` Alan Cox
2002-12-07 1:46 ` William Lee Irwin III
2002-12-07 1:56 ` Andrea Arcangeli
2002-12-07 2:31 ` Alan Cox
2002-12-07 2:09 ` William Lee Irwin III
2002-12-07 0:22 ` Andrea Arcangeli
2002-12-07 0:35 ` Andrew Morton
2002-12-07 0:46 ` William Lee Irwin III
2002-12-07 10:55 ` Arjan van de Ven
2002-12-06 10:36 ` Arjan van de Ven
2002-12-06 14:23 ` William Lee Irwin III
2002-12-06 15:12 ` William Lee Irwin III
2002-12-06 22:34 ` Andrea Arcangeli
2002-12-07 18:27 ` Eric W. Biederman
2002-12-06 1:08 ` Andrea Arcangeli
[not found] <mailman.1039133948.27411.linux-kernel2news@redhat.com>
2002-12-06 0:35 ` Pete Zaitcev
2002-12-06 1:27 ` Norman Gaywood
2002-12-06 12:48 ` Rik van Riel
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