linux-kernel - Re: [git head] Should X86_PAT really default to yes?

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Message-ID: <20080504090429.GC29318@elte.hu>
Date:	Sun, 4 May 2008 11:04:29 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Frans Pop <elendil@...net.nl>
Cc:	Jesse Barnes <jesse.barnes@...el.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	linux-kernel@...r.kernel.org,
	"Packard, Keith" <keith.packard@...el.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [git head] Should X86_PAT really default to yes?


* Frans Pop <elendil@...net.nl> wrote:

> On Friday 02 May 2008, Jesse Barnes wrote:
> > This is just a transient issue during VT switch or server exit though,
> > right? X functionality isn't affected, and your VTs work fine?
> 
> Transient only. I've just tested again and this time the band was 
> visible on top of the text on VT1 for about 2 seconds. Then it 
> disappeared. The artifacts also appear when I log out from KDE (i.e. 
> without exiting the server), and I also get the messages when logging 
> out and logging in again.
> 
> I do not see any performance issues, but I've only used this kernel 
> for a very short time.
> 
> > If so, it might not be a PAT issue but just a different memory 
> > layout or something (and therefore it would really just be a 
> > cosmetic bug in the X driver).
> 
> The artifacts may not be a PAT issue directly, but it is a clear 
> regression for me as I currently have a nice clean screen when X shuts 
> down. I'm also 100% sure that it is caused by enabling PAT. A kernel 
> with same config and only PAT disabled does not show the artifacts.

ok, Cc:-ed more folks - this bug has to be resolved regardless of the 
default selection.

	Ingo
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