From: Jeff Garzik <jgarzik@pobox.com>
To: Daniel Egger <degger@fhm.edu>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
Dave Jones <davej@codemonkey.org.uk>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Why does C3 CPU downgrade in kernel 2.4.20?
Date: Tue, 10 Dec 2002 15:17:58 -0500 [thread overview]
Message-ID: <20021210201758.GB28712@gtf.org> (raw)
In-Reply-To: <1039549178.7224.7.camel@sonja>
On Tue, Dec 10, 2002 at 08:39:38PM +0100, Daniel Egger wrote:
> Am Die, 2002-12-10 um 17.51 schrieb Alan Cox:
>
> > Well if you optimise for ppro it won't actually always work.
>
> Yeah, I had to learn earlier that it seems to support certain
> kind of cmovs but certainly not all of them and some other
> instructions seem also to be missing.
Yes.
> > Also thescheduling seems to be best with 486.
> > Remember the C3 is a single issue risc processor.
>
> Do you have pointers to some optimisation manual or whatever?
> gcc currently defines the c3 as 486+mmx+3dnow however I doubt
> that this model is entirely correct and as such leaves some
> space for improvements.
Definitely. Read my email message that went along with that commit for
more details ;-) (finding it isn't hard, it's probably one of the few
gcc-patches mails I have ever sent)
next prev parent reply other threads:[~2002-12-10 20:10 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 [this message]
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
2002-12-14 16:46 ` Denis Vlasenko
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