Re: [Gems-users] non-cacheable memory

[Mike Marty <mikem@xxxxxxxxxxx>]

If you are not interested in modeling the memory system affects of issuing
a request to memory, possibly incurring interconnect delays and etc., then
sure, return a fixed number of stall cycles to Simics

--Mike


> 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
> > >
> > >
> > >
> > >
> >
> ____________________________________________________________________________________
> > > Expecting? Get great news right away with email
> > Auto-Check.
> > > Try the Yahoo! Mail Beta.
> > >
> >
> http://advision.webevents.yahoo.com/mailbeta/newmail_tools.html
> > > _______________________________________________
> > > Gems-users mailing list
> > > Gems-users@xxxxxxxxxxx
> > >
> >
> https://lists.cs.wisc.edu/mailman/listinfo/gems-users
> > > Use Google to search the GEMS Users mailing list
> > by adding
> > "site:https://lists.cs.wisc.edu/archive/gems-users/";
> > to your search.
> > >
> > _______________________________________________
> > Gems-users mailing list
> > Gems-users@xxxxxxxxxxx
> >
> https://lists.cs.wisc.edu/mailman/listinfo/gems-users
> > Use Google to search the GEMS Users mailing list by
> > adding
> > "site:https://lists.cs.wisc.edu/archive/gems-users/";
> > to your search.
> >
> >
>
>
>
>
> ____________________________________________________________________________________
> Looking for earth-friendly autos?
> Browse Top Cars by "Green Rating" at Yahoo! Autos' Green Center.
> http://autos.yahoo.com/green_center/
> _______________________________________________
> Gems-users mailing list
> Gems-users@xxxxxxxxxxx
> https://lists.cs.wisc.edu/mailman/listinfo/gems-users
> Use Google to search the GEMS Users mailing list by adding "site:https://lists.cs.wisc.edu/archive/gems-users/"; to your search.
>