Thanks for bringing this up Will. We will reach out to AMD for feedback.
thanks,
Anthony
On Wed, May 31, 2023 at 10:41 AM William Cohen <wco...@redhat.com> wrote:
>
> 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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