From: Andrew Morton <akpm@osdl.org>
To: Christoph Lameter <clameter@sgi.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@vger.kernel.org,
torvalds@osdl.org
Subject: Re: [PATCH] Prefaulting
Date: Fri, 11 Mar 2005 17:22:28 -0800 [thread overview]
Message-ID: <20050311172228.773cf03d.akpm@osdl.org> (raw)
In-Reply-To: <Pine.LNX.4.58.0503110444220.19419@schroedinger.engr.sgi.com>
Christoph Lameter <clameter@sgi.com> wrote:
>
> This patch allows to aggregate multiple page faults into a single one. It
> does that by detecting that an application generates a sequence of page
> faults.
>
> ...
> Results that show the impact of this patch are available at
> http://oss.sgi.com/projects/page_fault_performance/
There are a lot of numbers there. Was there an executive summary?
>From a quick peek it seems that the patch makes negligible difference for a
kernel compilation when prefaulting 1-2 pages and slows the workload down
quite a lot when prefaulting up to 16 pages.
And for the uniprocessor "200 Megabyte allocation without prezeroing.
Single thread." workload it appears that the prefault patch slowed it down
by 4x.
Am I misreading the results? If not, it's a bit disappointing.
next prev parent reply other threads:[~2005-03-12 1:22 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-11 12:47 Christoph Lameter
2005-03-12 1:22 ` Andrew Morton [this message]
2005-03-12 3:30 ` Christoph Lameter
2005-03-12 3:43 ` Andrew Morton
2005-03-16 19:30 ` Christoph Lameter
2005-03-12 9:10 ` Arjan van de Ven
2005-03-14 18:42 ` Martin J. Bligh
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