From: Pavel Machek <pavel@ucw.cz>
To: Denis Vlasenko <vda@port.imtp.ilyichevsk.odessa.ua>
Cc: Daniel Egger <degger@fhm.edu>,
Dave Jones <davej@codemonkey.org.uk>,
Joseph <jospehchan@yahoo.com.tw>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: Why does C3 CPU downgrade in kernel 2.4.20?
Date: Thu, 12 Dec 2002 19:09:57 +0100 [thread overview]
Message-ID: <20021212180957.GA184@elf.ucw.cz> (raw)
In-Reply-To: <200212110829.gBB8Tja05013@Port.imtp.ilyichevsk.odessa.ua>
Hi!
> > > I believe someone (Jeff Garzik?) benchmarked gcc code generation,
> > > and the C3 executed code scheduled for a 486 faster than it did for
> > > -m586
> > > I'm not sure about the alignment flags. I've been meaning to look
> > > into that myself...
> >
> > Interesting. I have no clue about which C3 you're talking about here
> > but a VIA Ezra has all 686 instructions including cmov and thus
> > optimising for PPro works best for me.
> >
> > Prolly I would have to do more benchmarking to find out about
> > aligment advantages.
>
> I heard cmovs are microcoded in Centaurs.
>
> s...l...o...w...
It still might be faster then a branch... or not if centaurs are
really that simple.
Pavel
--
Worst form of spam? Adding advertisment signatures ala sourceforge.net.
What goes next? Inserting advertisment *into* email?
next prev parent reply other threads:[~2002-12-13 11:57 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-10 4:02 Why does C3 CPU downgrade in kernel 2.4.20? Joseph
2002-12-10 5:52 ` Dave Jones
2002-12-10 7:22 ` Daniel Egger
2002-12-10 7:24 ` Dave Jones
2002-12-10 7:53 ` Daniel Egger
2002-12-10 12:40 ` Juan Quintela
2002-12-10 15:40 ` Daniel Egger
2002-12-10 16:51 ` Alan Cox
2002-12-10 19:39 ` Daniel Egger
2002-12-10 20:17 ` Jeff Garzik
2002-12-10 21:24 ` Alan Cox
2002-12-11 18:51 ` Bill Davidsen
2002-12-11 19:14 ` Dave Jones
2002-12-11 19:42 ` Jeff Garzik
2002-12-11 19:51 ` Joel Jaeggli
2002-12-12 9:17 ` Joseph
2002-12-12 13:33 ` Dave Jones
2002-12-13 6:55 ` Joseph
2002-12-13 11:04 ` Daniel Egger
2002-12-13 11:57 ` Dave Jones
2002-12-11 21:00 ` Alan Cox
2002-12-12 10:19 ` P
2002-12-11 13:19 ` Denis Vlasenko
2002-12-11 10:58 ` Dave Jones
2002-12-11 19:09 ` Denis Vlasenko
2002-12-11 14:59 ` Dave Jones
2002-12-12 18:09 ` Pavel Machek [this message]
2002-12-14 16:46 ` Denis Vlasenko
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