Hi,
I would say it depends on the config script you are using.
For example se.py is a correctly assigning different clock domains between the
system and the CPUs:
system.clk_domain = SrcClockDomain(
clock=args.sys_clock, voltage_domain=system.voltage_domain
)
[…]
system.cpu_clk_domain = SrcClockDomain(
clock=args.cpu_clock, voltage_domain=system.cpu_voltage_domain
)
[…]
for cpu in system.cpu:
cpu.clk_domain = system.cpu_clk_domain
and finally, in Simulation.run:
515 for i in range(np):
516 if options.fast_forward:
517 testsys.cpu[i].max_insts_any_thread =
int(options.fast_forward)
518 switch_cpus[i].system = testsys
519 switch_cpus[i].workload = testsys.cpu[i].workload
520 switch_cpus[i].clk_domain = testsys.cpu[i].clk_domain
But these are just example scripts wrapping the m5.switchCpu API. Could it be
that you are using a different script which is not performing the last
assignment to the switch cpus?
Kind Regards
Giacomo
From: FILIPPO LANDI via gem5-users <gem5-users@gem5.org>
Date: Tuesday, 6 December 2022 at 16:20
To: gem5-users@gem5.org <gem5-users@gem5.org>
Cc: FILIPPO LANDI <filippo.la...@edu.unife.it>
Subject: [gem5-users] Switch CPU clock speed
Hi, I'm using gem5 in gem5-aladdin software.
Using the fast forward option the switch cpu uses the system clock instead of
the cpu clock.
I just want to know if it was a bug in an old gem5 version or it is a
limitation of the simulator etc.
Maybe someone have tested it in a new build so can tell me if the clock is what
they expect to be.
Thank you!
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