From: Andrew Morton <akpm@linux-foundation.org>
To: Christoph Lameter <clameter@sgi.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, mel@csn.ul.ie,
ak@suse.de, apw@shadowen.org
Subject: Re: x86_64: Make sparsemem/vmemmap the default memory model
Date: Thu, 15 Nov 2007 14:12:12 -0800 [thread overview]
Message-ID: <20071115141212.acb215f1.akpm@linux-foundation.org> (raw)
In-Reply-To: <Pine.LNX.4.64.0711121940410.30269@schroedinger.engr.sgi.com>
On Mon, 12 Nov 2007 19:42:31 -0800 (PST)
Christoph Lameter <clameter@sgi.com> wrote:
> x86_64: Make sparsemem/vmemmap the default memory model
>
> Use sparsemem as the only memory model for UP, SMP and NUMA.
> Measurements indicate that DISCONTIGMEM has a higher overhead
> than sparsemem. And FLATMEMs benefits are minimal. So I think its
> best to simply standardize on sparsemem.
Unfortunately some loon has gone and merged the i386 and x86_64 Kconfig
files. I was fixing that up but I worry what effects these Kconfig changes
might have on, for example, i386 NUMA setups.
So I'll duck this version, sorry.
WARNING: multiple messages have this Message-ID (diff)
From: Andrew Morton <akpm@linux-foundation.org>
To: Christoph Lameter <clameter@sgi.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, mel@csn.ul.ie,
ak@suse.de, apw@shadowen.org
Subject: Re: x86_64: Make sparsemem/vmemmap the default memory model
Date: Thu, 15 Nov 2007 14:12:12 -0800 [thread overview]
Message-ID: <20071115141212.acb215f1.akpm@linux-foundation.org> (raw)
In-Reply-To: <Pine.LNX.4.64.0711121940410.30269@schroedinger.engr.sgi.com>
On Mon, 12 Nov 2007 19:42:31 -0800 (PST)
Christoph Lameter <clameter@sgi.com> wrote:
> x86_64: Make sparsemem/vmemmap the default memory model
>
> Use sparsemem as the only memory model for UP, SMP and NUMA.
> Measurements indicate that DISCONTIGMEM has a higher overhead
> than sparsemem. And FLATMEMs benefits are minimal. So I think its
> best to simply standardize on sparsemem.
Unfortunately some loon has gone and merged the i386 and x86_64 Kconfig
files. I was fixing that up but I worry what effects these Kconfig changes
might have on, for example, i386 NUMA setups.
So I'll duck this version, sorry.
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next prev parent reply other threads:[~2007-11-15 22:13 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-12 23:52 x86_64: Make sparsemem/vmemmap the default memory model Christoph Lameter
2007-11-12 23:52 ` Christoph Lameter
2007-11-12 23:59 ` Andi Kleen
2007-11-12 23:59 ` Andi Kleen
2007-11-13 0:42 ` Christoph Lameter
2007-11-13 0:42 ` Christoph Lameter
2007-11-13 0:49 ` Andi Kleen
2007-11-13 0:49 ` Andi Kleen
2007-11-13 3:42 ` Christoph Lameter
2007-11-13 3:42 ` Christoph Lameter
2007-11-13 4:27 ` Ray Lee
2007-11-13 4:27 ` Ray Lee
2007-11-13 4:41 ` Christoph Lameter
2007-11-13 4:41 ` Christoph Lameter
2007-11-13 20:41 ` Jörn Engel
2007-11-13 20:41 ` Jörn Engel
2007-11-13 21:52 ` Christoph Lameter
2007-11-13 22:30 ` Jörn Engel
2007-11-13 22:30 ` Jörn Engel
2007-11-15 22:12 ` Andrew Morton [this message]
2007-11-15 22:12 ` Andrew Morton
2007-11-16 2:24 ` Christoph Lameter
2007-11-16 2:24 ` Christoph Lameter
2007-11-16 2:52 ` Andrew Morton
2007-11-16 2:52 ` Andrew Morton
2007-11-16 3:55 ` x86_64: Make sparsemem/vmemmap the default memory model V2 Christoph Lameter
2007-11-16 3:55 ` Christoph Lameter
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