Re: [microblaze-uclinux] OT?, Performance

[emanuel stiebler <emu@xxxxxxxxxxx>]

Goran Bilski wrote:

> The 100 DMIPS is when running at 125 MHz with the HW divider enabled and 
> running from BRAM.
> On a 100 MHz microblaze running from external memory this is what you 
> can expect.
> I'm however working on things to improve this but this is the current fact.
> So a 150 MHz MicroBlaze in V2P will give you around 50 DMIPS with 
> external memories.
> It's also depending on the external memory. A fast SRAM will give you 
> better values than a SDRAM.
> A really fast SRAM can improve it quite a lot. But they are expensive.

You have any experience what type of SRAM would give the best results,
for lets say a 8 MByte system ? Any idea what the speedup would be ?

> Another way to improve the numbers is to use the harvard architecute of 
> MicroBlaze and have 2 OPB busses and two external memories.

But we can't support it on the uclinux ...

Cheers,
emanuel



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