linux-kernel - RE: [PATCH] mm,x86: limit 32 bit kernel to 12GB memory

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Message-ID: <BLU177-W475A0F6393620E8B6BB671C3A60@phx.gbl>
Date:	Sat, 11 May 2013 02:16:43 -0700
From:	Yuhong Bao <yuhongbao_386@...mail.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	"Pierre-Loup A. Griffais" <pgriffais@...vesoftware.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"sonnyrao@...omium.org" <sonnyrao@...omium.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fu>
Subject: RE: [PATCH] mm,x86: limit 32 bit kernel to 12GB memory

>  - I don't think it's necessarily "system stability". The problem with
> large amounts of highmem ends up being that we end up using up almost
> all of the lowmem just to *track* the huge amount of highmem, and then
> we have so little lowmem that we suck at performance and have various
> random problems. So it's not just "system stability", it's more fluid
> than that.

FYI 32-bit Windows already limits to 16GB when 3G/1G split is used for a similar reason. (They default to 2G/2G split.)

Yuhong Bao 		 	   		  --
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