linux-kernel - Re: [PATCH 3/3] tools/power turbostat: allow turbostat to work when aperf is not available

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Message-ID: <25d6584f-7763-4b6e-92da-e8f1e31ea3df@redhat.com>
Date: Mon, 1 Dec 2025 10:13:18 -0500
From: David Arcari <darcari@...hat.com>
To: Len Brown <lenb@...nel.org>
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] tools/power turbostat: allow turbostat to work when
 aperf is not available



On 11/25/25 4:55 PM, David Arcari wrote:
> 
> 
> On 11/25/25 2:14 PM, Len Brown wrote:
>> It would be helpful if you could describe exactly what environment you
>> are running in.
> 
> It' a VMWARE instance.
> 
> CPUID(0): AuthenticAMD 0xd CPUID levels
> CPUID(1): family:model:stepping 0x17:0:0 (23:0:0) microcode 0x0
> CPUID(0x80000000): max_extended_levels: 0x8000001f
> CPUID(1): SSE3 - - - - TSC MSR - - -
> CPUID(6): No-APERF, No-TURBO, No-DTS, No-PTM, No-HWP, No-HWPnotify, No- 
> HWPwindow, No-HWPepp, No-HWPpkg, No-EPB
> CPUID(7): No-SGX No-Hybrid
> 
> 
>>
>> are there any MSRs?
> 
> I'm not certain, is there something in particular you are looking for?
> 

rdmsr returns zero for MSR_IA32_APERF and MSR_IA32_MPERF.

>> Is APERF available via perf, but not via MSR?
>> etc.

No.  add_msr_perf_counter() returns -1 as the call to open_perf_counter 
returns -1.

> 
> I don't believe that APERF was available via perf. I'll go back and 
> verify when I have a chance.
> 
> -DA
> 
Is there anything else you need?

Thanks,
-DA