linux-kernel - Re: [PATCH] x86_32: trim memory by updating e820 v3

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Message-ID: <4815FBD3.6050902@zoopnet.de>
Date:	Mon, 28 Apr 2008 18:31:15 +0200
From:	Mika Fischer <mika.fischer@...pnet.de>
To:	Jesse Barnes <jesse.barnes@...el.com>
CC:	Ingo Molnar <mingo@...e.hu>, Gabriel C <nix.or.die@...glemail.com>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>, balajirrao@...il.com,
	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86_32: trim memory by updating e820 v3

Jesse Barnes schrieb:
> On Monday, April 28, 2008 6:53 am Ingo Molnar wrote:
>> i think we should still try to make this a non-default option because
>> modern Xorg should not have any need to touch MTRRs. Perhaps a .config
>> dependent on CONFIG_DANGEROUS ;-)
> 
> Well, not quite... we're still waiting on some way of getting WC semantics for 
> sysfs PCI files.  Suresh tells me something like that is queued up, but until 
> that hits the mainline X will still need to bang the MTRRs to get decent 
> performance.

Do you happen to know if this new sysfs-way will work correctly in the
case where the MTRRs explicitly say that the video-memory is uncachable?

Regards,
 Mika
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