Re: Pismo status
- To: "Timothy A. Seufert" <tas@mindspring.com>
- Cc: luther@dpt-info.u-strasbg.fr, Michael Schmitz <schmitz@opal.biophys.uni-duesseldorf.de>, Albrecht Dreß <ad@mpifr-bonn.mpg.de>, Tim Wojtulewicz <Tim.Wojtulewicz@nau.edu>, linuxppc-dev@lists.linuxppc.org, debian-powerpc@lists.debian.org
- Subject: Re: Pismo status
- From: Sven LUTHER <luther@debian.org>
- Date: Thu, 18 May 2000 16:33:42 +0200
- Message-id: <[🔎] 20000518163342.A14744@lambda.u-strasbg.fr>
- Mail-followup-to: "Timothy A. Seufert" <tas@mindspring.com>, luther@dpt-info.u-strasbg.fr, Michael Schmitz <schmitz@opal.biophys.uni-duesseldorf.de>, Albrecht Dreß <ad@mpifr-bonn.mpg.de>, Tim Wojtulewicz <Tim.Wojtulewicz@nau.edu>, linuxppc-dev@lists.linuxppc.org, debian-powerpc@lists.debian.org
- Reply-to: luther@dpt-info.u-strasbg.fr
- In-reply-to: <v04220800b5492487abdb@[10.0.0.42]>; from tas@mindspring.com on Wed, May 17, 2000 at 10:15:24PM -0700
- References: <[🔎] 39226066.BF822A70@mpifr-bonn.mpg.de> <[🔎] Pine.LNX.4.10.10005171253140.16549-100000@opal.biophys.uni-duesseldorf.de <[🔎] 20000517140836.A12638@lambda.u-strasbg.fr> <v04220800b5492487abdb@[10.0.0.42]>
On Wed, May 17, 2000 at 10:15:24PM -0700, Timothy A. Seufert wrote:
> At 2:08 PM +0200 5/17/00, Sven LUTHER wrote:
> >On Wed, May 17, 2000 at 12:54:22PM +0200, Michael Schmitz wrote:
> >> > Tim Wojtulewicz wrote:
> >> > > No it's definitely supposed to have a fan. It comes on in MacOS.
> >> > > The problem is that the PMU is not fully supported yet, so it doesn't
> >> > > understand that the processor is too hot. I'm trying to find
> >> > ^^^^^^^^^^^^^^^^^^^^
> >> > Does this mean that I can damage the machine if I just run a high-load
> >> > program?!?
> >>
> >> I strongly doubt that. The PMU should handle this autonomously, regardless
> >> of Linux support for the PMU.
> >
> >Also, i think the ppc cpu will halt itself when becoming too hot,
>
> No, it will not.
>
> The PowerPC 750 (G3) and 7400 (G4) can both fire off an interrupt
> when the on-die temperature sensor reading rises above a trigger
> value (or falls below a second trigger value). This feature *could*
> be used by an operating system to slow down the CPU (through the
So this mean that the G3 and G4 cpus have both the equivalent of
speedstep/whatever that AMD & Intel are introducing as a big novelty ?
> instruction cache throttling feature) or halt it to prevent
> overheating. However, there is no hardware feature which can halt
> the CPU without software control.
Are you sure about this ? did you already manage to burn out a ppc cpu like
you do when running a pentium without a fan ?
> > and not let
> >itself burn. At elast it was so since the earlier 680x0 cpus.
>
> As far as I know none of the 680x0 CPUs even had an on-die
> temperature sensor, let alone a thermal shutdown feature.
I think to remember that the later 680X0 have, maybe not a temperature sensor,
but a way to halt themself before burning, ...
Friendly,
Sven LUTHER
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