| Message ID | 20201110083936.31994-4-ggherdovich@suse.cz |
|---|---|
| State | Accepted |
| Commit | 3149cd55302748df771dc1c8c10f34b1cbce88ed |
| Headers | show |
| Series | Add support for frequency invariance to AMD EPYC Zen2 | expand |
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 1e6fed437b0c..ad0647b2d7c3 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -2110,6 +2110,7 @@ static void init_freq_invariance(bool secondary, bool cppc_ready) if (ret) { init_counter_refs(NULL); static_branch_enable(&arch_scale_freq_key); + pr_info("Estimated ratio of average max frequency by base frequency (times 1024): %llu\n", arch_max_freq_ratio); } else { pr_debug("Couldn't determine max cpu frequency, necessary for scale-invariant accounting.\n"); }
The value freq_max/freq_base is a fundamental component of frequency invariance calculations. It may come from a variety of sources such as MSRs or ACPI data, tracking it down when troubleshooting a system could be non-trivial. It is worth saving it in the kernel logs. # dmesg | grep 'Estimated ratio of average max' [ 14.024036] smpboot: Estimated ratio of average max frequency by base frequency (times 1024): 1289 Signed-off-by: Giovanni Gherdovich <ggherdovich@suse.cz> --- arch/x86/kernel/smpboot.c | 1 + 1 file changed, 1 insertion(+)