RE: [microblaze-uclinux] uclinux / MicroBlaze SMP

[George Smith <gesmith@xxxxxxxxxxxxxxxxxx>]

hi
 Thanks for the feed back. In future applications I'll need SMP
capabilities. It's hard to say how many CPU's should be supported. As
you've pointed out, there will be other system constraints such as
memory bandwidth. I'd like to see up to 4 supported however this is just
a SWAG.

gesmith
 
On Tue, 2005-10-18 at 02:43, Goran Bilski wrote:
> Hi,
> 
> Better I respond to the FAE question here then going through him.
> 
> Write-back caches are on our wishlist but it hasn't been scheduled yet.
> 
> Cache coherency is something that I have discussed with John Williams but we haven't come to a conclusion on that yet.
> Think we need to constrain the problem a little and maybe also doing some benchmark test to see what solution make sense.
> Should it only support two MicroBlazes or should it support N number of MicroBlaze?
> 
> I feel that the future is more on distributed processing than centralized processing ala SMP. The memory bandwidth is just too fast becoming the bottleneck of the system. Writeback caches will help but the end result is inevitable that memory interface will be the bottleneck.
> 
> My vision is more on 20-100 MicroBlaze and that will just not work with SMP style.
> 
> Göran
> 
> 
> -----Original Message-----
> From: owner-microblaze-uclinux@xxxxxxxxxxxxxx [mailto:owner-microblaze-uclinux@xxxxxxxxxxxxxx] On Behalf Of George Smith
> Sent: Monday, October 17, 2005 21:58
> To: microblaze-uclinux@xxxxxxxxxxxxxx
> Subject: Re: [microblaze-uclinux] uclinux / MicroBlaze SMP
> 
> On Mon, 2005-10-17 at 13:36, Stephen Craven wrote:
> > Does anyone know the state of SMP on the MicroBlaze?
> > 
>  I've just asked my local FAE to check on write-back cache and cache
> coherency with MicroBlaze. I'll post when he gets back to me. 
>  
> > What hardware modifications, other than a coherent cache, are needed?
> > 
>  I also believe you'd need write-back cache for any speed up with SMP...
> 
> > Many thanks!
> > Stephen Craven
> > 
> gesmith
> 
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-- 
George Smith
VP Engineering
Linear Acoustic, Inc

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