Re: [Gems-users] non-cacheable memory

["Dave Z." <zhu_dave@xxxxxxxxx>]

Thanks for your reply, Mike. But I'm not sure I
understand your approach. Could you please elaborate?

Also, I don't understand why I shouldn't return
immediately from ruby_operate. I'm not interested in
any timing for those memory locations. I would like to
set a constant latency for the requests to those
locations and not to pollute the L1/L2 cache.

Thank you.

Dave


--- Mike Marty <mikem@xxxxxxxxxxx> wrote:

> 
> If memory is non-cacheable, you certainly do not
> want to return
> immediately from ruby_operate.
> 
> Choose a protocol that has silent S eviction, and
> add a request type to
> ensure your cache doesn't get the block in M state
> (exclusive).  Ok, we've
> covered loads.  Not sure how you want to handle
> Stores.
> 
> --mike
> 
> 
> > Hi,
> >
> > I would like to treat certain memory locations as
> > non-cacheable because I don't want to pollute the
> L1
> > cache. So, I was wondering if there was a way to
> do
> > this in Ruby. Perhaps I could return immediately
> from
> > ruby_operate? What should be the returned value
> from
> > ruby_operate? The number of cycles that Simics has
> to
> > wait (the latency of the operation)?
> >
> > Thank you,
> >
> > Dave
> >
> >
> >
> >
>
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