Hi,
We have been doing some testing of libpfm on AMD Zen 4 processors. One of the
the issues that came up that libpfm identified AMD Genoa processors as Zen 4,
but did not identify the AMD Bergamo processors as Zen4 processors. This
appears to be due to the following code in lib/pfmlib_amd64.c:
} else if (cfg->family == 25) { /* family 19h */
if (cfg->model <= 0x0f || (cfg->model >= 0x20 && cfg->model <=
0x5f)) {
rev = PFM_PMU_AMD64_FAM19H_ZEN3;
} else if (cfg->model == 17) {
rev = PFM_PMU_AMD64_FAM19H_ZEN4;
}
}
The Genoa processor has the listed model number of 17, but the Bergamo has a
different module number (160) and does not match as a result. I took a look at
the kernel's perf code to see if there was additional model numbers listed in
there. The kernel is using capabilities bits to determine what features to
enable for zen4 so didn't have additional model numbers listed for zen4
processors. Looking around there doesn't seem to be a good place enumerating
the possible AMD zen4 processor model numbers. It would be nice to avoid the
having to tweak model number matchine for zen4 every time a new zen4 model
comes out.
-Will
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