Hi,
I am trying to model a single Cortex-A9 as featured in the Exynos4412
using this configuration: http://pastebin.com/t1AU4D7H
I wonder if someone else has modelled a similar processor or has any
knowledge about the parameters, and is able to help me with the
configuration. Using the current configuration I get some performance
discepancy compared to the real hardware. The configuration string
used to run gem5 (stable) is the following:
{..}gem5.opt --debug-flags=Cache,MemoryAccess,Exec,-ExecSymbol
--remote-gdb-port=0 --debug-file=trace.out -d m5out/add-adc
{..}configs/example/se.py -c bin/binary --cpu-type=exynos_4412p
--mem-type=LPDDR2_S4_1066_x32 --sys-clock=400MHz --cpu-clock=1700MHz
--num-l3caches=0 --caches --l2cache --l2_assoc=16 --l1d_size=32kB
--l2_size=1MB --mem-size=2048MB
Small loops with integer operations are slightly faster on hardware (~
25%), while general benchmarks are slightly faster in the simulator (~
25%). I wonder if this might be due to memory misconfiguration and
that the Fast-loop-mode featured in the Cortex-A9 seems to be missing
from gem5?
Best regards,
Stian Hvatum
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