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Re: Slow MPC board?
----- Original Message -----
From: "Gary Thomas" <gary@mlbassoc.com>
To: "Daniel Lidsten" <Daniel.Lidsten@combitechsystems.com>
Cc: "eCos Discussion" <ecos-discuss@sources.redhat.com>
Sent: Tuesday, August 26, 2003 3:31 PM
Subject: Re: [ECOS] Slow MPC board?
> On Tue, 2003-08-26 at 08:16, Daniel Lidsten wrote:
> > Hi,
> >
> > I think that my board is quite slow but i cannot find why. When i look
> > in the user manual/realtime characterization for the Cogent CMA MPC860
> > 33Mhz then i find it much faster then my MPC823e 50Mhz. The cogent board
> > handles a clock interrupt in 14 us, i do it in 50us. A thread switch
> > takes 7.5us on the cogent board and 14us on my board.
> >
> > The above big difference goes through all measurements - my board is
> > clocked faster then the cogent board but have half the performance. I
> > have the caches (both I and D) enabled.
> >
> > Ideas? Can it be any configuration issue?
> >
>
> It could be DRAM timings - does the 823 use a UPM?
Frank:-) Is the Core deserialised ?
The UPM is as all MPC8XX processors there should be no difference
>
> --
> Gary Thomas <gary@mlbassoc.com>
> MLB Associates
>
>
> --
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