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Re: Slow MPC board?
- From: Gary Thomas <gary at mlbassoc dot com>
- To: Daniel Lidsten <Daniel dot Lidsten at combitechsystems dot com>
- Cc: eCos Discussion <ecos-discuss at sources dot redhat dot com>
- Date: 26 Aug 2003 08:31:12 -0600
- Subject: Re: [ECOS] Slow MPC board?
- Organization: MLB Associates
- References: <004B1D7A5257174C9044A1B7BD0E60ED232DA6@ratatosk.combitechsystems.com>
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?
--
Gary Thomas <gary@mlbassoc.com>
MLB Associates
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