Thanks a lot for the help Emilio and Amin. I had to create different
clock_domains in python and it works well.
On 02/05/14, "Castillo Villar, Emilio" wrote:
>
> P {margin-top:0;margin-bottom:0;}
>
> Hello,
>
> I am trying to do something similar where each core has it's own clock,
> To do this I'm creating a ClockDomain per core in the fs.py script.
>
> Looking like:
>
> test_sys.cpu_clk_domain = SrcClockDomain(clock = "2GHz",
> voltage_domain =
> test_sys.cpu_voltage_domain)
>
> test_sys.cpu_slow_clk_domain = SrcClockDomain(clock = "1GHz",
> voltage_domain =
> test_sys.cpu_voltage_domain)
>
> Then I manually instantiate the cpus as it follows:
>
> test_sys.cpu = [TestCPUClass(clk_domain=test_sys.cpu_clk_domain, cpu_id=0),
> TestCPUClass(clk_domain=test_sys.cpu_slow_clk_domain, cpu_id=1)]
>
> This way you will get an independent clock domain for each core and its
> associated caches,
> if you change it's value with your DFS implementation I think it may work.
>
> However I have been trying to boot cpus with different clock values in FS
> mode, and with the timing cpu I get TSC related errors and the simulation
> stalls after a bit. doing a cat /proc/cpuinfo shows the same cpu freq for all
> the cores. If anyone has an insight on this I will be very grateful.
>
> --Emilio
>
> De: [email protected] [[email protected]] en nombre de
> Amin Farmahini [[email protected]]
> Enviado: miércoles, 05 de febrero de 2014 7:45
> Para: gem5 users mailing list
> Asunto: Re: [gem5-users] Per core DFS implementation
>
>
>
> Hi Srini,
>
>
> You could have a separate clock domain for each core and each clock domain
> has its own clock period. Take a look at src/sim/clocked_object.hh .
>
> And I am no expert, so hopefully experienced users could provide more
> detailed info.
>
>
>
> Thanks,
> Amin
>
>
>
> On Wed, Feb 5, 2014 at 12:23 AM, Srinivasan Narayanamoorthy
> <[email protected](javascript:main.compose()> wrote:
>
> > Hi,This is Srini. I have implemented a system level DFS in gem5 and it
> > seems to be working. Now I am trying to implement per-core DFS in gem5.
> > With the current class hierarchy, clockedObject is the parent of the cpu
> > classes and there is just one _clockPeriod member. Thus all cpu's update
> > the same _clockPeriod member and the clocks to the cpu change with every
> > core updating it. It would be really nice if some one can give any
> > suggestions on how to do per-core dfs. I am using a fairly recent revision
> > of gem5. When I checked some older versions(2012) I saw that the clock
> > period variable was part of the cpu class and hence per-core dfs would have
> > been straightforward. Please bear with me if I am naive.
> >
> >
> > Thanks
> > Srini
> > _______________________________________________
> > gem5-users mailing list
> > [email protected](javascript:main.compose()
> > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
> >
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