From: Andreas Ferber <aferber@techfak.uni-bielefeld.de>
To: "David S. Miller" <davem@redhat.com>
Cc: torvalds@transmeta.com, Dieter.Nuetzel@hamburg.de,
linux-kernel@vger.kernel.org
Subject: Re: 7.52 second kernel compile
Date: Tue, 19 Mar 2002 02:37:55 +0100 [thread overview]
Message-ID: <20020319023755.A28383@devcon.net> (raw)
In-Reply-To: <200203182312.24958.Dieter.Nuetzel@hamburg.de> <Pine.LNX.4.33.0203181434440.10517-100000@penguin.transmeta.com> <20020318.162031.98995076.davem@redhat.com>
On Mon, Mar 18, 2002 at 04:20:31PM -0800, David S. Miller wrote:
>
> Or maybe the program is just flawed, and the interesting 1/8 pattern comes
> from something else altogether.
> I think the weird Athlon behavior has to do with the fact that
> you've made your little test program as much of a cache tester
> as a TLB tester :-)
Erm, you forgot COW semantics. The accesses to buffer are actually all
going to the same physical address. As CPU caches work on physical
addresses AFAIK (everything else would be just stupid ;-), there are
no cache misses (disregarding a few produced by IRQs/scheduling etc.).
Andreas
--
Andreas Ferber - dev/consulting GmbH - Bielefeld, FRG
---------------------------------------------------------
+49 521 1365800 - af@devcon.net - www.devcon.net
next prev parent reply other threads:[~2002-03-19 1:38 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-18 22:12 7.52 second kernel compile Dieter Nützel
2002-03-18 22:46 ` Linus Torvalds
2002-03-18 23:53 ` Davide Libenzi
2002-03-19 0:20 ` David S. Miller
2002-03-19 0:47 ` Davide Libenzi
2002-03-19 1:37 ` Andreas Ferber [this message]
2002-03-19 1:38 ` David S. Miller
2002-03-19 2:08 ` Linus Torvalds
2002-03-19 5:24 ` Erik Andersen
-- strict thread matches above, loose matches on Subject: below --
2002-03-13 8:52 10.31 " Anton Blanchard
2002-03-16 6:15 ` 7.52 " Anton Blanchard
2002-03-16 8:05 ` Linus Torvalds
2002-03-16 11:04 ` Paul Mackerras
2002-03-16 18:32 ` Linus Torvalds
2002-03-17 2:00 ` Paul Mackerras
2002-03-17 2:40 ` Linus Torvalds
2002-03-17 2:50 ` M. Edward Borasky
2002-03-18 19:42 ` Cort Dougan
2002-03-18 20:04 ` Linus Torvalds
2002-03-18 20:23 ` Linus Torvalds
2002-03-18 21:50 ` Rene Herman
2002-03-18 22:36 ` Cort Dougan
2002-03-18 22:47 ` Linus Torvalds
2002-03-18 22:56 ` Cort Dougan
2002-03-18 23:52 ` Paul Mackerras
2002-03-19 0:57 ` Dave Jones
2002-03-19 3:35 ` Jeff Garzik
2002-03-19 0:22 ` David S. Miller
2002-03-19 0:27 ` Cort Dougan
2002-03-19 0:27 ` David S. Miller
2002-03-19 0:36 ` Cort Dougan
2002-03-19 0:38 ` David S. Miller
2002-03-19 1:28 ` Davide Libenzi
2002-03-19 2:42 ` Paul Mackerras
2002-03-27 2:53 ` Richard Henderson
2002-04-02 4:32 ` Linus Torvalds
2002-04-02 10:50 ` Pablo Alcaraz
2002-03-18 21:34 ` Cort Dougan
2002-03-18 22:00 ` Linus Torvalds
2002-03-18 19:37 ` Cort Dougan
2002-03-16 11:54 ` yodaiken
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