Messages in this thread Patch in this message | | | From | Giovanni Gherdovich <> | Subject | [PATCH 3/3] x86: Print ratio freq_max/freq_base used in frequency invariance calculations | Date | Tue, 10 Nov 2020 09:39:36 +0100 |
| |
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(+)
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"); } -- 2.26.2
| |