using Perf and LIKWID for MILAN cpu

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Aug 25, 2024, 12:25:53 AM8/25/24

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Hi everyone,

Using Likwid, I am trying to verify what I am observing from collecting all activities on DF counters on a Milan CPU.

I am running Likwid with this command

likwid-perfctr -C 0 -g MEM1 -m ./stream_triad_likwid_5G_10x to collect the memory accesses and I am getting this

DRAM_CHANNEL_0 0
DRAM_CHANNEL_1 0
DRAM_CHANNEL_2 6344369000
DRAM_CHANNEL_3 6344458000
DRAM_CHANNEL_4 6347401000
DRAM_CHANNEL_5 6348221000
DRAM_CHANNEL_6 0
DRAM_CHANNEL_7 0
==============================
Sum = 25G

but when I am using perf stat command I am getting this which is way lower than what I am getting from Likwid. I saw this page

https://github.com/RRZE-HPC/likwid/wiki/TutorialLikwidPerf

but the problem is that I can't find /sys/devices/amd_l3 or amd_df and I can't load this amd-uncore.ko because i do not have this file.

Does it mean that Milan does not support this?

CPU name: AMD EPYC 7313P 16-Core Processor
CPU type: AMD K19 (Zen3) architecture
CPU clock: 3.00 GHz

1,297 r3807 -75.01%
0 r3847 -75.00%
0 r3887 -75.01%
18,992,415 r38c7 -75.00%
1,457 r38107 -75.00%
5,322,830,413 r38147 -75.00%
9,882,455,382 r38187 -74.99%
19,013,627 r381c7 -74.99%
=============================
sum = 15G

I also asked a same question in here

https://groups.google.com/g/likwid-users/c/Fq2331EQhy4/m/eJAj9vddAwAJ?utm_medium=email&utm_source=footer