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Re: The new scheduler and x86 CPUs
- To: Jakub Jelinek <jakub at redhat dot com>
- Subject: Re: The new scheduler and x86 CPUs
- From: Vladimir Makarov <vmakarov at redhat dot com>
- Date: Wed, 29 Aug 2001 11:15:47 -0400
- CC: "Vladimir N. Makarov" <vmakarov at cygnus dot com>, Bernd Schmidt <bernds at redhat dot com>, "jh at suse dot cz" <jh at suse dot cz>, "gcc at gcc dot gnu dot org" <gcc at gcc dot gnu dot org>
- References: <3B8C2E14.41CD486B@redhat.com> <39AB2661.EFAF26D0@cygnus.com> <20010829115635.G5765@sunsite.ms.mff.cuni.cz>
Jakub Jelinek wrote:
> On Mon, Aug 28, 2000 at 10:56:33PM -0400, Vladimir N. Makarov wrote:
> > > Is Ultrasparc III out-of-order? I thought it was in-order too. There's
> > > nothing in
> > > http://www.sun.com/sparc/UltraSPARC-III/USIIITech.html
> > > that suggests it's OOO. So it isn't all that surprising to me that it's
> > > slow as well.
> > >
> > Even UltrasparcI was an OOO processor.
> Depends on what you imagine under OOO.
> UltraSPARC-I up to III always issue insns in program order AFAIK, they may
> complete out of order, but I guess that is not what is discussed here.
I was wrong. It is not an OOO processor. It also needs a good scheduler
then. It is the same approach as powerpc 750.