From: Andrew Morton <akpm@osdl.org>
To: Christoph Lameter <clameter@sgi.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Prezeroing V8
Date: Thu, 17 Mar 2005 15:59:08 -0800 [thread overview]
Message-ID: <20050317155908.56e77b8e.akpm@osdl.org> (raw)
In-Reply-To: <Pine.LNX.4.58.0503171525360.10205@schroedinger.engr.sgi.com>
Christoph Lameter <clameter@sgi.com> wrote:
>
> On Thu, 17 Mar 2005, Andrew Morton wrote:
>
> > > > It's hard to know what to think about this without benchmarking numbers.
>
> http://oss.sgi.com/projects/page_fault_performance/
Oh no, not that page again ;)
Seems to say that prezeroing makes negligible difference to kernel builds,
but speeds up a big malloc+memset by 3x to 4x, yes?
Are there any real-worldish workloads which show an appreciable benefit?
The large speedup for a big memset seems odd - I assume it's simply
transferring CPU load from the user's process over to kscrubd. Or is it
the fancy page-zeroing hardware? How do we differentiate the two?
Are there any workloads which are seeing a benefit on a CPU which doesn't
have the zeroing hardware?
next prev parent reply other threads:[~2005-03-17 23:59 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-17 21:43 Christoph Lameter
2005-03-17 22:08 ` Andrew Morton
2005-03-17 22:31 ` Christoph Lameter
2005-03-17 23:11 ` Andrew Morton
2005-03-17 23:24 ` Christoph Lameter
2005-03-17 23:52 ` Andrew Morton
2005-03-18 0:00 ` Christoph Lameter
2005-03-17 23:26 ` Christoph Lameter
2005-03-17 23:59 ` Andrew Morton [this message]
2005-03-18 0:04 ` Christoph Lameter
2005-03-18 0:17 ` Andrew Morton
2005-03-18 0:29 ` Christoph Lameter
2005-03-18 1:36 ` [PATCH] Prezeroing V8 + free_hot_zeroed_page + free_cold_zeroed page Christoph Lameter
2005-03-18 2:06 ` Jason Uhlenkott
2005-03-18 2:09 ` Christoph Lameter
2005-03-18 5:43 ` Nish Aravamudan
2005-03-17 22:59 ` [PATCH] Prezeroing V8 Nish Aravamudan
2005-03-17 23:06 ` Christoph Lameter
2005-03-18 3:14 ` Benjamin Herrenschmidt
2005-03-25 1:44 ` Pavel Machek
2005-03-25 12:28 ` Jan Engelhardt
2005-03-29 1:50 ` [PATCH] " Christoph Lameter
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