linux-kernel - Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops

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Message-ID: <20071211163706.2dc82275@tux.DEF.witbe.net>
Date:	Tue, 11 Dec 2007 16:37:06 +0100
From:	Paul Rolland <rol@...917.net>
To:	Rene Herman <rene.herman@...access.nl>
Cc:	David Newall <david@...idnewall.com>,
	"H. Peter Anvin" <hpa@...or.com>, Krzysztof Halasa <khc@...waw.pl>,
	Pavel Machek <pavel@....cz>, Andi Kleen <andi@...stfloor.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"David P. Reed" <dpreed@...d.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, rol@...be.net
Subject: Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64
 with MCP51 laptops

Hello,

On Tue, 11 Dec 2007 16:28:56 +0100
Rene Herman <rene.herman@...access.nl> wrote:

> On 11-12-07 15:15, Rene Herman wrote:
> 
> > On 11-12-07 14:32, Paul Rolland wrote:
> > 
> This might be a bit more constant, I suppose. This serialises with cpuid. 
> Don't see a difference locally, but perhaps you do.
Well, yes, at least on the PIII and the Opteron... Core2 is still changing
a lot...

> On a Duron 1300 with an actual ISA bus, "out" is between 1300 and 1600 for 
> me and "in" between 1200 and 1500 with a few flukes above that which will I 
> suppose be caused by the bus (ISA _or_ PCI) being momentarily busy or some 
> such...
The results :

Core 2Duo 1.73 GHz :
[root@tux tmp]# ./in2
out: 2777
in : 2519
[root@tux tmp]# ./in2
out: 2440
in : 2391
[root@tux tmp]# ./in2
out: 2460
in : 2388

Pentium III :
[root@...-dev /tmp]# ./in2
out: 746
in : 747
[root@...-dev /tmp]# ./in2
out: 746
in : 747
[root@...-dev /tmp]# ./in2
out: 746
in : 745

AMD Opteron 150 :
-bash-3.1# ./in2
out: 4846
in : 4845
-bash-3.1# ./in2
out: 4846
in : 4846
-bash-3.1# ./in2
out: 4846
in : 4845

Paul
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