From: "Simen Thoresen" <simen-tt@online.no>
To: arjanv@redhat.com
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Athlon bug stomper. Pls apply.
Date: Wed, 19 Sep 2001 22:36:08 +0200 [thread overview]
Message-ID: <200109192236080281.11BCB708@scispor.dolphinics.no> (raw)
In-Reply-To: <3BA8EA04.E55BAA02@redhat.com>
In-Reply-To: <9oafeu$1o0$1@penguin.transmeta.com> <Pine.LNX.4.30.0109191141560.24917-100000@anime.net> <3BA8EA04.E55BAA02@redhat.com>
>Dan Hollis wrote:
>>
>> On Wed, 19 Sep 2001, Linus Torvalds wrote:
>> > It is _probably_ an undocumented performance thing, and clearing that
>> > bit may slow something down. But it might also change some behaviour,
>> > and knowing _what_ the behaviour is might be very useful for figuring
>> > out what it is that triggers the problem.
>>
>> AFAIK noone has even tested it yet to see what it does to performance! Eg
>> it might slow down memory access so that athlon-optimized memcopy is now
>> slower than non-athlon-optimized memcopy. And if it turns out to be the
>> case, we might as well just use the non-athlon-optimized memcopy instead
>> of twiddling undocumented northbridge bits...
>
>Ok but that part is simple:
>
>run
>
>http://www.fenrus.demon.nl/athlon.c
>
On my non-buggy(*) KT133A board with the 55th register set to 09 I get these results;
Athlon test program $Id: fast.c,v 1.6 2000/09/23 09:05:45 arjan Exp $
clear_page() tests
clear_page function 'warm up run' took 21729 cycles per page
clear_page function '2.4 non MMX' took 13341 cycles per page
clear_page function '2.4 MMX fallback' took 13346 cycles per page
clear_page function '2.4 MMX version' took 15574 cycles per page
clear_page function 'faster_clear_page' took 4965 cycles per page
clear_page function 'even_faster_clear' took 4884 cycles per page
copy_page() tests
copy_page function 'warm up run' took 21294 cycles per page
copy_page function '2.4 non MMX' took 38093 cycles per page
copy_page function '2.4 MMX fallback' took 38270 cycles per page
copy_page function '2.4 MMX version' took 21380 cycles per page
copy_page function 'faster_copy' took 10775 cycles per page
copy_page function 'even_faster' took 11262 cycles per page
Setting the register to 00
Athlon test program $Id: fast.c,v 1.6 2000/09/23 09:05:45 arjan Exp $
clear_page() tests
clear_page function 'warm up run' took 21719 cycles per page
clear_page function '2.4 non MMX' took 13392 cycles per page
clear_page function '2.4 MMX fallback' took 13354 cycles per page
clear_page function '2.4 MMX version' took 15615 cycles per page
clear_page function 'faster_clear_page' took 4963 cycles per page
clear_page function 'even_faster_clear' took 4886 cycles per page
copy_page() tests
copy_page function 'warm up run' took 21033 cycles per page
copy_page function '2.4 non MMX' took 37879 cycles per page
copy_page function '2.4 MMX fallback' took 37938 cycles per page
copy_page function '2.4 MMX version' took 21124 cycles per page
copy_page function 'faster_copy' took 10717 cycles per page
copy_page function 'even_faster' took 11130 cycles per page
In my view these are pretty similar.
(*) - Yes, I did report a buggy KT133A Epox 8KTA/3 board, but the board and processor croaked, and my vendor replaced them with an Epox 8KTA/3 Pro board, and I've had no problems with it so far.
Yours,
-Simen
--
Simen Thoresen, Beowulf-cleaner and random artist - close and personal.
Er det ikke rart?
The gnu RART-project on http://valinor.dolphinics.no:1080/~simentt/rart
next prev parent reply other threads:[~2001-09-19 20:31 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-18 14:51 [PATCH] Athlon bug stomper. Pls apply VDA
2001-09-18 15:43 ` Alan Cox
2001-09-20 4:56 ` Albert D. Cahalan
2001-09-18 17:45 ` Jeff Garzik
2001-09-18 21:39 ` Liakakis Kostas
2001-09-19 13:08 ` Re[2]: " VDA
2001-09-19 13:41 ` Liakakis Kostas
2001-09-19 13:47 ` Thomas Langås
2001-09-19 14:31 ` Liakakis Kostas
2001-09-19 14:43 ` Stefan Smietanowski
2001-09-19 14:55 ` Re[2]: " Jan Niehusmann
2001-09-19 14:57 ` Liakakis Kostas
2001-09-19 18:12 ` Alan Cox
2001-09-19 21:18 ` Re[2]: [PATCH] VIA " Aaron Tiensivu
2001-09-19 23:04 ` Roberto Jung Drebes
2001-09-19 23:41 ` Nicholas Knight
2001-09-19 16:00 ` Re[2]: [PATCH] Athlon " Linus Torvalds
2001-09-19 17:15 ` safemode
2001-09-19 18:22 ` Stefan Smietanowski
2001-09-19 23:41 ` Re[2]: " Nicholas Knight
2001-09-20 15:10 ` Marek Mentel
2001-09-19 18:43 ` Dan Hollis
2001-09-19 18:55 ` Arjan van de Ven
2001-09-19 19:00 ` Roberto Jung Drebes
2001-09-19 19:17 ` Arjan van de Ven
2001-09-19 20:16 ` Dan Hollis
2001-09-19 19:50 ` Ignacio Vazquez-Abrams
2001-09-19 20:01 ` Ignacio Vazquez-Abrams
2001-09-19 20:40 ` Ignacio Vazquez-Abrams
2001-09-19 21:43 ` safemode
2001-09-19 22:22 ` Brad Pepers
2001-09-19 22:28 ` Erno Kuusela
2001-09-19 20:36 ` Vojtech Pavlik
2001-09-19 20:57 ` Dan Hollis
2001-09-19 21:29 ` Vojtech Pavlik
2001-09-19 23:23 ` Luigi Genoni
2001-09-19 18:58 ` Re[2]: " Roberto Jung Drebes
2001-09-19 20:35 ` Athlon bug stomper: perf. results brian
2001-09-19 20:30 ` Dan Hollis
2001-09-19 22:14 ` brian
2001-09-19 22:08 ` Dan Hollis
2001-09-19 20:36 ` Simen Thoresen [this message]
2001-09-19 20:37 ` [PATCH] Athlon bug stomper. Pls apply Dan Hollis
2001-09-19 20:51 ` Simen Thoresen
2001-09-19 23:00 ` Roberto Jung Drebes
2001-09-20 9:03 ` VDA
2001-09-21 0:46 ` Re[2]: " Pavel Machek
2001-09-20 0:19 ` Nicholas Knight
2001-09-20 1:27 ` Stefan Smietanowski
2001-09-20 9:54 ` Re[2]: " Liakakis Kostas
2001-09-19 23:04 ` Luigi Genoni
2001-09-19 14:05 ` Tom Diehl
2001-09-23 23:33 ` Jan Niehusmann
2001-09-24 15:44 ` bill davidsen
2001-09-19 21:15 Petr Vandrovec
2001-09-19 19:21 ` Arjan van de Ven
2001-09-19 19:51 ` Dan Hollis
2001-09-19 19:59 ` Arjan van de Ven
2001-09-19 21:44 ` Eric W. Biederman
2001-09-19 22:13 ` Dan Hollis
2001-09-19 22:49 ` John Alvord
2001-09-19 23:14 ` Dan Hollis
2001-09-19 23:32 ` Daniel T. Chen
2001-09-19 22:55 ` Roberto Jung Drebes
2001-09-21 17:22 ` bill davidsen
2001-09-21 19:13 ` Dan Hollis
2001-09-19 20:52 ` Vojtech Pavlik
2001-09-19 23:33 Leif Sawyer
2001-09-20 13:08 Petr Vandrovec
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