gem5/tests/configs/realview-simple-timing.py
Andreas Hansson 88554790c3 Mem: Use cycles to express cache-related latencies
This patch changes the cache-related latencies from an absolute time
expressed in Ticks, to a number of cycles that can be scaled with the
clock period of the caches. Ultimately this patch serves to enable
future work that involves dynamic frequency scaling. As an immediate
benefit it also makes it more convenient to specify cache performance
without implicitly assuming a specific CPU core operating frequency.

The stat blocked_cycles that actually counter in ticks is now updated
to count in cycles.

As the timing is now rounded to the clock edges of the cache, there
are some regressions that change. Plenty of them have very minor
changes, whereas some regressions with a short run-time are perturbed
quite significantly. A follow-on patch updates all the statistics for
the regressions.
2012-10-15 08:10:54 -04:00

98 lines
3.1 KiB
Python

# Copyright (c) 2006-2007 The Regents of The University of Michigan
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# Authors: Steve Reinhardt
import m5
from m5.objects import *
m5.util.addToPath('../configs/common')
import FSConfig
# --------------------
# Base L1 Cache
# ====================
class L1(BaseCache):
hit_latency = 2
response_latency = 2
block_size = 64
mshrs = 4
tgts_per_mshr = 8
is_top_level = True
# ----------------------
# Base L2 Cache
# ----------------------
class L2(BaseCache):
block_size = 64
hit_latency = 20
response_latency = 20
mshrs = 92
tgts_per_mshr = 16
write_buffers = 8
# ---------------------
# I/O Cache
# ---------------------
class IOCache(BaseCache):
assoc = 8
block_size = 64
hit_latency = 50
response_latency = 50
mshrs = 20
size = '1kB'
tgts_per_mshr = 12
addr_ranges = [AddrRange(0, size='256MB')]
forward_snoops = False
#cpu
cpu = TimingSimpleCPU(cpu_id=0)
#the system
system = FSConfig.makeArmSystem('timing', "RealView_PBX", None, False)
system.cpu = cpu
#create the iocache
system.iocache = IOCache(clock = '1GHz')
system.iocache.cpu_side = system.iobus.master
system.iocache.mem_side = system.membus.slave
#connect up the cpu and caches
cpu.addTwoLevelCacheHierarchy(L1(size = '32kB', assoc = 1),
L1(size = '32kB', assoc = 4),
L2(size = '4MB', assoc = 8))
# create the interrupt controller
cpu.createInterruptController()
# connect cpu and caches to the rest of the system
cpu.connectAllPorts(system.membus)
# set the cpu clock along with the caches and l1-l2 bus
cpu.clock = '2GHz'
root = Root(full_system=True, system=system)
m5.ticks.setGlobalFrequency('1THz')