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Date: Fri, 6 Apr 2001 21:31:00 +0200 (MET DST)
From: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
To: Andrea Arcangeli <andrea@suse.de>
cc: "Eric W. Biederman" <ebiederm@xmission.com>,
        Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        James Simmons <jsimmons@linux-fbdev.org>,
        Alan Cox <alan@lxorguk.ukuu.org.uk>,
        Linux Fbdev development list 
	<linux-fbdev-devel@lists.sourceforge.net>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [Linux-fbdev-devel] Re: fbcon slowness [was NTP on 2.4.2?]
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On Fri, 6 Apr 2001, Andrea Arcangeli wrote:

> ev6 works the way you described AFIK (to flush the write buffer you can use

 Thanks for the clarification -- you made me calm down.

> wmb(), note that wmb() semantics doesn't require the cpu to really "flush" but
> just to keep writes oredered across other mb or wmb, but it's basically the
> same from a software point of you and flushing the write buffer synchronously
> obviously provides that semantics).  I didn't followed very closely the

 Of course -- you only want to do mb (and not wmb) if you need to meet
hw's specific timing or you want to perform a read from a volatile
register of a peripheral device. 

> previous part of the thread so I'm not sure what is the issue.

 Someone complained of Alpha not having Intel-style MTRRs to set write
combining for fb memory...

-- 
+  Maciej W. Rozycki, Technical University of Gdansk, Poland   +
+--------------------------------------------------------------+
+        e-mail: macro@ds2.pg.gda.pl, PGP key available        +

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