linux-kernel - Re: [PATCH] 2.6.23-rc1-mm1 - fix missing numa_zonelist

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Message-Id: <20070803092755.55220aa0.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 3 Aug 2007 09:27:55 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Lee Schermerhorn <Lee.Schermerhorn@...com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Christoph Lameter <clameter@....com>
Subject: Re: [PATCH] 2.6.23-rc1-mm1 - fix missing numa_zonelist_order sysctl

On Thu, 02 Aug 2007 11:07:38 -0400
Lee Schermerhorn <Lee.Schermerhorn@...com> wrote:

> Of course, I don't have any idea of what is a "reasonable amount".
> Guess I could look at non-movable zone memory usage in a system at
> typical or peak load to get an idea.  Anyone have any data in this
> regard?
> 
I'm sorry that I have no data and idea. 
ZONE_MOVABLE is too young to be used under business workload...

just I feel...
Considering i686 which divides memory into NORMAL and HIGHMEM, it seems
that 4G to 8G servers looks stable under various workload in my experience.

Then, at least, 12.5% to 25% of "Total Memory - Hugepages" memory should be
under ZONE_NORMAL. But this is from experience of 32bit/SMP :(

Thanks,
-Kame

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