Re: [Gems-users] question about simics clock frequency

[Mike Marty <mikem@xxxxxxxxxxx>]

It also probably makes some difference when Simics models I/O.

But does it really matter?  I personally don't think so as long as you
aren't too off (setting Simics to 20MHz probably isn't good idea).  I set
my Ruby/Opal parameters (e.g. L2_RESPONSE_LATENCY and etc) to match my
target technology assumptions regardless of what Simics thinks the exact
clock frequency is.

--Mike


> if this is the case, does the cpu frequency value matter for simulation accuracy?
> Can we just use 4G as cpu frequency to represent a modern cpu?
> Thanks
>
> Fei
>
> Mike Marty <mikem@xxxxxxxxxxx> ： > I use simics with Ruby only that simulates a 2 core CMP architecture.
> > I change the simics clock frequency from 20Mhz to 2048Mhz, the results of L2 misses per processor are quite different.
> > The cpu-switch-time is set to be 1.
> > I am wondering how cpu clock frequency affects the cache accesses flow?
> >
>
> Simics will probably generate a different code path because of things
> like the RTC (real-time clock) interrupt.
>
> --Mike
>
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