Hello all,
I want to figure out the effects of prefetchers on CPU performance.
So I run gem5 in SE mode and choose O3_ARM_v7a as the CPU type.
I config the stride prefetcher in l2cache in the CPU configuration script named
O3_ARM_v7a.py.
The problem is that the prefetcher is only enabled when I add "--l2-hwp-type
StridePrefetcher" in the command line.
I check out the config.ini file and find that the stride prefetcher
configuration is not the same as what I did in O3_ARM_v7a.py.
For example, the prefetch degree of prefetchers I config is 8, but the actual
prefetch degree when running is 4, and 4 is the
initial value of this prefetcher option.
Besides, I change other options in O3_ARM_v7a.py, such as MSHR number in
l2cache, these options work normally when gem5 is running.
So I have two questions about this :
1. why the prefetcher is only enabled when we add the "--l2-hwp-type" options
in the command line?
2. when adding "--l2-hwp type", why the configuration of prefetchers is not
enabled?
The prefetcher in L2cache is configured as follows:
class O3_ARM_v7aL2(Cache):
tag_latency = 12
data_latency = 12
response_latency = 12
mshrs = 16
tgts_per_mshr = 8
size = '1MB'
assoc = 16
write_buffers = 8
prefetch_on_access = True
clusivity = 'mostly_incl'
# Simple stride prefetcher
prefetcher = StridePrefetcher(degree=8, latency = 1)
tags = BaseSetAssoc()
replacement_policy = RandomRP()
The version of gem5 I am using is 21.2.1.0.
Best Regards, Gelin
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