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Re: [patch] pg-r4k.c cp0 hazards for R4000/R4400

To: Ralf Baechle <>
Subject: Re: [patch] pg-r4k.c cp0 hazards for R4000/R4400
From: "Maciej W. Rozycki" <>
Date: Tue, 3 Feb 2004 17:03:29 +0100 (CET)
In-reply-to: <>
Organization: Technical University of Gdansk
Original-recipient: rfc822;
References: <> <> <> <>
On Tue, 3 Feb 2004, Ralf Baechle wrote:

> >  Perhaps it wasn't really tested.  Have you ever run the code on a PC 
> > variant?  Has anyone else?
> Yes, it has.  Olivetti M700-10, around 2.2 or so.  The code used at that
> time in arch/mips/mm/r4xx0.c was not much different from what pg-r4k.c is
> generating now that is it violates this hazard.

 OK then.

> >  I suppose so -- without the "mips-pg-r4k-scache" patch my system is very
> > unstable and the difference is essentially that in addition to
> > Create_Dirty_Excl_SD there are additional Create_Dirty_Excl_D ones, that,
> > apart from being a performance hit, shouldn't have any effect.  I have to
> > investigate it further yet.
> Interesting, I was expecting somewhat better performance from the
> combination of both.  Anyway, what is now in CVS is tested on R4400SC V4.0.

 After rereading the description I agree with you, so I am going to get at 
the code again soon.

+  Maciej W. Rozycki, Technical University of Gdansk, Poland   +
+        e-mail:, PGP key available        +

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