* Sometimes I only see 3 RAPL (out of 4) Counters
@ 2025-09-11 0:20 Kenneth Crudup
2025-09-11 9:42 ` Rafael J. Wysocki
0 siblings, 1 reply; 5+ messages in thread
From: Kenneth Crudup @ 2025-09-11 0:20 UTC (permalink / raw)
To: linux-pm@vger.kernel.org; +Cc: Kenneth C
I have a Dell XPS-9320, with a i7-1280P (family: 0x6, model: 0x9a,
stepping: 0x3) CPU. Sometimes I'll only see 3 RAPL counters instead of
the normal 4. (It used to happen a lot more often, BTW):
----
gunzip --force --stdout /var/log/syslog* | fgrep -i rapl | fgrep fixed
2025-09-08T12:09:05.915989-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
unit is 2^-32 Joules, 3 fixed counters, 655360 ms ovfl timer
2025-09-09T08:52:19.098522-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
2025-09-09T17:25:24.377784-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
2025-09-09T17:50:09.334140-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
2025-09-10T16:42:13.259270-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
unit is 2^-32 Joules, 3 fixed counters, 655360 ms ovfl timer
2025-09-10T16:46:36.322016-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
2025-09-02T13:05:02.632218-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
2025-09-02T14:07:19.683466-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
2025-09-02T14:20:43.602483-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
2025-09-04T13:13:38.636326-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
2025-09-05T09:21:50.147180-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
2025-08-29T10:57:14.419740-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
2025-08-17T11:52:55.733943-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
2025-08-19T07:52:30.696326-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
2025-08-19T07:55:49.083600-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
2025-08-20T10:53:54.601680-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
2025-08-20T11:00:09.560496-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
2025-08-20T11:12:30.580414-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
----
... and it's always(?) the GPU RAPL:
----
gunzip --force --stdout /var/log/syslog* | fgrep -i rapl | cut -d\] -f2-
| sort -f | uniq -c
grep: (standard input): binary file matches
18 intel_rapl_common: Found RAPL domain core
36 intel_rapl_common: Found RAPL domain package
18 intel_rapl_common: Found RAPL domain psys
16 intel_rapl_common: Found RAPL domain uncore
18 intel_rapl_msr: PL4 support detected.
2 RAPL PMU: API unit is 2^-32 Joules, 3 fixed counters, 655360
ms ovfl timer
16 RAPL PMU: API unit is 2^-32 Joules, 4 fixed counters, 655360
ms ovfl timer
18 RAPL PMU: hw unit of domain package 2^-14 Joules
18 RAPL PMU: hw unit of domain pp0-core 2^-14 Joules
16 RAPL PMU: hw unit of domain pp1-gpu 2^-14 Joules
18 RAPL PMU: hw unit of domain psys 2^-14 Joules
----
A reboot fixes it up again (and that's if I even notice), but what would
cause this to happen? What's the effect of it missing the RAPL counter, BTW?
LMK if you need more info,
-Kenny
--
Kenneth R. Crudup / Sr. SW Engineer, Scott County Consulting, Orange
County CA
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Sometimes I only see 3 RAPL (out of 4) Counters
2025-09-11 0:20 Sometimes I only see 3 RAPL (out of 4) Counters Kenneth Crudup
@ 2025-09-11 9:42 ` Rafael J. Wysocki
2025-09-11 18:37 ` srinivas pandruvada
0 siblings, 1 reply; 5+ messages in thread
From: Rafael J. Wysocki @ 2025-09-11 9:42 UTC (permalink / raw)
To: Kenneth Crudup, Srinivas Pandruvada, Zhang, Rui; +Cc: linux-pm@vger.kernel.org
+Srinivas & Rui
On Thu, Sep 11, 2025 at 2:20 AM Kenneth Crudup <kenny@panix.com> wrote:
>
> I have a Dell XPS-9320, with a i7-1280P (family: 0x6, model: 0x9a,
> stepping: 0x3) CPU. Sometimes I'll only see 3 RAPL counters instead of
> the normal 4. (It used to happen a lot more often, BTW):
>
> ----
> gunzip --force --stdout /var/log/syslog* | fgrep -i rapl | fgrep fixed
> 2025-09-08T12:09:05.915989-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
> unit is 2^-32 Joules, 3 fixed counters, 655360 ms ovfl timer
> 2025-09-09T08:52:19.098522-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> 2025-09-09T17:25:24.377784-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> 2025-09-09T17:50:09.334140-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> 2025-09-10T16:42:13.259270-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
> unit is 2^-32 Joules, 3 fixed counters, 655360 ms ovfl timer
> 2025-09-10T16:46:36.322016-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> 2025-09-02T13:05:02.632218-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> 2025-09-02T14:07:19.683466-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> 2025-09-02T14:20:43.602483-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> 2025-09-04T13:13:38.636326-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> 2025-09-05T09:21:50.147180-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> 2025-08-29T10:57:14.419740-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> 2025-08-17T11:52:55.733943-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> 2025-08-19T07:52:30.696326-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> 2025-08-19T07:55:49.083600-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> 2025-08-20T10:53:54.601680-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> 2025-08-20T11:00:09.560496-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> 2025-08-20T11:12:30.580414-07:00 xps-9320 kernel: [ T1] RAPL PMU: API
> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> ----
>
> ... and it's always(?) the GPU RAPL:
>
> ----
> gunzip --force --stdout /var/log/syslog* | fgrep -i rapl | cut -d\] -f2-
> | sort -f | uniq -c
> grep: (standard input): binary file matches
> 18 intel_rapl_common: Found RAPL domain core
> 36 intel_rapl_common: Found RAPL domain package
> 18 intel_rapl_common: Found RAPL domain psys
> 16 intel_rapl_common: Found RAPL domain uncore
> 18 intel_rapl_msr: PL4 support detected.
> 2 RAPL PMU: API unit is 2^-32 Joules, 3 fixed counters, 655360
> ms ovfl timer
> 16 RAPL PMU: API unit is 2^-32 Joules, 4 fixed counters, 655360
> ms ovfl timer
> 18 RAPL PMU: hw unit of domain package 2^-14 Joules
> 18 RAPL PMU: hw unit of domain pp0-core 2^-14 Joules
> 16 RAPL PMU: hw unit of domain pp1-gpu 2^-14 Joules
> 18 RAPL PMU: hw unit of domain psys 2^-14 Joules
> ----
>
> A reboot fixes it up again (and that's if I even notice), but what would
> cause this to happen? What's the effect of it missing the RAPL counter, BTW?
>
> LMK if you need more info,
>
> -Kenny
>
> --
> Kenneth R. Crudup / Sr. SW Engineer, Scott County Consulting, Orange
> County CA
>
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Sometimes I only see 3 RAPL (out of 4) Counters
2025-09-11 9:42 ` Rafael J. Wysocki
@ 2025-09-11 18:37 ` srinivas pandruvada
2025-09-11 18:40 ` Kenneth Crudup
0 siblings, 1 reply; 5+ messages in thread
From: srinivas pandruvada @ 2025-09-11 18:37 UTC (permalink / raw)
To: Rafael J. Wysocki, Kenneth Crudup, Zhang, Rui; +Cc: linux-pm@vger.kernel.org
On Thu, 2025-09-11 at 11:42 +0200, Rafael J. Wysocki wrote:
> +Srinivas & Rui
>
> On Thu, Sep 11, 2025 at 2:20 AM Kenneth Crudup <kenny@panix.com>
> wrote:
> >
> > I have a Dell XPS-9320, with a i7-1280P (family: 0x6, model: 0x9a,
> > stepping: 0x3) CPU. Sometimes I'll only see 3 RAPL counters instead
> > of
> > the normal 4. (It used to happen a lot more often, BTW):
> >
That is because sometimes the counter for PP1 (GFX ..) is 0 during boot
and then the PMU code will ignore that. This happens when the counter
is sampled before GPU is not even started. So this is a race condition.
Thanks,
Srinivas
> > ----
> > gunzip --force --stdout /var/log/syslog* | fgrep -i rapl | fgrep
> > fixed
> > 2025-09-08T12:09:05.915989-07:00 xps-9320 kernel: [ T1] RAPL
> > PMU: API
> > unit is 2^-32 Joules, 3 fixed counters, 655360 ms ovfl timer
> > 2025-09-09T08:52:19.098522-07:00 xps-9320 kernel: [ T1] RAPL
> > PMU: API
> > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > 2025-09-09T17:25:24.377784-07:00 xps-9320 kernel: [ T1] RAPL
> > PMU: API
> > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > 2025-09-09T17:50:09.334140-07:00 xps-9320 kernel: [ T1] RAPL
> > PMU: API
> > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > 2025-09-10T16:42:13.259270-07:00 xps-9320 kernel: [ T1] RAPL
> > PMU: API
> > unit is 2^-32 Joules, 3 fixed counters, 655360 ms ovfl timer
> > 2025-09-10T16:46:36.322016-07:00 xps-9320 kernel: [ T1] RAPL
> > PMU: API
> > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > 2025-09-02T13:05:02.632218-07:00 xps-9320 kernel: [ T1] RAPL
> > PMU: API
> > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > 2025-09-02T14:07:19.683466-07:00 xps-9320 kernel: [ T1] RAPL
> > PMU: API
> > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > 2025-09-02T14:20:43.602483-07:00 xps-9320 kernel: [ T1] RAPL
> > PMU: API
> > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > 2025-09-04T13:13:38.636326-07:00 xps-9320 kernel: [ T1] RAPL
> > PMU: API
> > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > 2025-09-05T09:21:50.147180-07:00 xps-9320 kernel: [ T1] RAPL
> > PMU: API
> > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > 2025-08-29T10:57:14.419740-07:00 xps-9320 kernel: [ T1] RAPL
> > PMU: API
> > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > 2025-08-17T11:52:55.733943-07:00 xps-9320 kernel: [ T1] RAPL
> > PMU: API
> > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > 2025-08-19T07:52:30.696326-07:00 xps-9320 kernel: [ T1] RAPL
> > PMU: API
> > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > 2025-08-19T07:55:49.083600-07:00 xps-9320 kernel: [ T1] RAPL
> > PMU: API
> > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > 2025-08-20T10:53:54.601680-07:00 xps-9320 kernel: [ T1] RAPL
> > PMU: API
> > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > 2025-08-20T11:00:09.560496-07:00 xps-9320 kernel: [ T1] RAPL
> > PMU: API
> > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > 2025-08-20T11:12:30.580414-07:00 xps-9320 kernel: [ T1] RAPL
> > PMU: API
> > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > ----
> >
> > ... and it's always(?) the GPU RAPL:
> >
> > ----
> > gunzip --force --stdout /var/log/syslog* | fgrep -i rapl | cut -d\]
> > -f2-
> > > sort -f | uniq -c
> > grep: (standard input): binary file matches
> > 18 intel_rapl_common: Found RAPL domain core
> > 36 intel_rapl_common: Found RAPL domain package
> > 18 intel_rapl_common: Found RAPL domain psys
> > 16 intel_rapl_common: Found RAPL domain uncore
> > 18 intel_rapl_msr: PL4 support detected.
> > 2 RAPL PMU: API unit is 2^-32 Joules, 3 fixed counters,
> > 655360
> > ms ovfl timer
> > 16 RAPL PMU: API unit is 2^-32 Joules, 4 fixed counters,
> > 655360
> > ms ovfl timer
> > 18 RAPL PMU: hw unit of domain package 2^-14 Joules
> > 18 RAPL PMU: hw unit of domain pp0-core 2^-14 Joules
> > 16 RAPL PMU: hw unit of domain pp1-gpu 2^-14 Joules
> > 18 RAPL PMU: hw unit of domain psys 2^-14 Joules
> > ----
> >
> > A reboot fixes it up again (and that's if I even notice), but what
> > would
> > cause this to happen? What's the effect of it missing the RAPL
> > counter, BTW?
> >
> > LMK if you need more info,
> >
> > -Kenny
> >
> > --
> > Kenneth R. Crudup / Sr. SW Engineer, Scott County Consulting,
> > Orange
> > County CA
> >
> >
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Sometimes I only see 3 RAPL (out of 4) Counters
2025-09-11 18:37 ` srinivas pandruvada
@ 2025-09-11 18:40 ` Kenneth Crudup
2025-09-11 20:11 ` srinivas pandruvada
0 siblings, 1 reply; 5+ messages in thread
From: Kenneth Crudup @ 2025-09-11 18:40 UTC (permalink / raw)
To: srinivas pandruvada, Rafael J. Wysocki, Zhang, Rui
Cc: linux-pm@vger.kernel.org, Kenneth C
On 9/11/25 11:37, srinivas pandruvada wrote:
> On Thu, 2025-09-11 at 11:42 +0200, Rafael J. Wysocki wrote:
>> +Srinivas & Rui
>>
>> On Thu, Sep 11, 2025 at 2:20 AM Kenneth Crudup <kenny@panix.com>
>> wrote:
>>>
>>> I have a Dell XPS-9320, with a i7-1280P (family: 0x6, model: 0x9a,
>>> stepping: 0x3) CPU. Sometimes I'll only see 3 RAPL counters instead
>>> of
>>> the normal 4. (It used to happen a lot more often, BTW):
>>>
>
> That is because sometimes the counter for PP1 (GFX ..) is 0 during boot
> and then the PMU code will ignore that. This happens when the counter
> is sampled before GPU is not even started. So this is a race condition.
Is there anything that should/could be done about it?
What's the effect of not having a GPU RAPL available?
> Thanks,
> Srinivas
>
>
>>> ----
>>> gunzip --force --stdout /var/log/syslog* | fgrep -i rapl | fgrep
>>> fixed
>>> 2025-09-08T12:09:05.915989-07:00 xps-9320 kernel: [ T1] RAPL
>>> PMU: API
>>> unit is 2^-32 Joules, 3 fixed counters, 655360 ms ovfl timer
>>> 2025-09-09T08:52:19.098522-07:00 xps-9320 kernel: [ T1] RAPL
>>> PMU: API
>>> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
>>> 2025-09-09T17:25:24.377784-07:00 xps-9320 kernel: [ T1] RAPL
>>> PMU: API
>>> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
>>> 2025-09-09T17:50:09.334140-07:00 xps-9320 kernel: [ T1] RAPL
>>> PMU: API
>>> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
>>> 2025-09-10T16:42:13.259270-07:00 xps-9320 kernel: [ T1] RAPL
>>> PMU: API
>>> unit is 2^-32 Joules, 3 fixed counters, 655360 ms ovfl timer
>>> 2025-09-10T16:46:36.322016-07:00 xps-9320 kernel: [ T1] RAPL
>>> PMU: API
>>> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
>>> 2025-09-02T13:05:02.632218-07:00 xps-9320 kernel: [ T1] RAPL
>>> PMU: API
>>> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
>>> 2025-09-02T14:07:19.683466-07:00 xps-9320 kernel: [ T1] RAPL
>>> PMU: API
>>> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
>>> 2025-09-02T14:20:43.602483-07:00 xps-9320 kernel: [ T1] RAPL
>>> PMU: API
>>> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
>>> 2025-09-04T13:13:38.636326-07:00 xps-9320 kernel: [ T1] RAPL
>>> PMU: API
>>> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
>>> 2025-09-05T09:21:50.147180-07:00 xps-9320 kernel: [ T1] RAPL
>>> PMU: API
>>> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
>>> 2025-08-29T10:57:14.419740-07:00 xps-9320 kernel: [ T1] RAPL
>>> PMU: API
>>> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
>>> 2025-08-17T11:52:55.733943-07:00 xps-9320 kernel: [ T1] RAPL
>>> PMU: API
>>> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
>>> 2025-08-19T07:52:30.696326-07:00 xps-9320 kernel: [ T1] RAPL
>>> PMU: API
>>> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
>>> 2025-08-19T07:55:49.083600-07:00 xps-9320 kernel: [ T1] RAPL
>>> PMU: API
>>> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
>>> 2025-08-20T10:53:54.601680-07:00 xps-9320 kernel: [ T1] RAPL
>>> PMU: API
>>> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
>>> 2025-08-20T11:00:09.560496-07:00 xps-9320 kernel: [ T1] RAPL
>>> PMU: API
>>> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
>>> 2025-08-20T11:12:30.580414-07:00 xps-9320 kernel: [ T1] RAPL
>>> PMU: API
>>> unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
>>> ----
>>>
>>> ... and it's always(?) the GPU RAPL:
>>>
>>> ----
>>> gunzip --force --stdout /var/log/syslog* | fgrep -i rapl | cut -d\]
>>> -f2-
>>>> sort -f | uniq -c
>>> grep: (standard input): binary file matches
>>> 18 intel_rapl_common: Found RAPL domain core
>>> 36 intel_rapl_common: Found RAPL domain package
>>> 18 intel_rapl_common: Found RAPL domain psys
>>> 16 intel_rapl_common: Found RAPL domain uncore
>>> 18 intel_rapl_msr: PL4 support detected.
>>> 2 RAPL PMU: API unit is 2^-32 Joules, 3 fixed counters,
>>> 655360
>>> ms ovfl timer
>>> 16 RAPL PMU: API unit is 2^-32 Joules, 4 fixed counters,
>>> 655360
>>> ms ovfl timer
>>> 18 RAPL PMU: hw unit of domain package 2^-14 Joules
>>> 18 RAPL PMU: hw unit of domain pp0-core 2^-14 Joules
>>> 16 RAPL PMU: hw unit of domain pp1-gpu 2^-14 Joules
>>> 18 RAPL PMU: hw unit of domain psys 2^-14 Joules
>>> ----
>>>
>>> A reboot fixes it up again (and that's if I even notice), but what
>>> would
>>> cause this to happen? What's the effect of it missing the RAPL
>>> counter, BTW?
>>>
>>> LMK if you need more info,
>>>
>>> -Kenny
>>>
>>> --
>>> Kenneth R. Crudup / Sr. SW Engineer, Scott County Consulting,
>>> Orange
>>> County CA
>>>
>>>
>
--
Kenneth R. Crudup / Sr. SW Engineer, Scott County Consulting, Orange
County CA
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Sometimes I only see 3 RAPL (out of 4) Counters
2025-09-11 18:40 ` Kenneth Crudup
@ 2025-09-11 20:11 ` srinivas pandruvada
0 siblings, 0 replies; 5+ messages in thread
From: srinivas pandruvada @ 2025-09-11 20:11 UTC (permalink / raw)
To: Kenneth Crudup, Rafael J. Wysocki, Zhang, Rui; +Cc: linux-pm@vger.kernel.org
On Thu, 2025-09-11 at 11:40 -0700, Kenneth Crudup wrote:
>
>
> On 9/11/25 11:37, srinivas pandruvada wrote:
> > On Thu, 2025-09-11 at 11:42 +0200, Rafael J. Wysocki wrote:
> > > +Srinivas & Rui
> > >
> > > On Thu, Sep 11, 2025 at 2:20 AM Kenneth Crudup <kenny@panix.com>
> > > wrote:
> > > >
> > > > I have a Dell XPS-9320, with a i7-1280P (family: 0x6, model:
> > > > 0x9a,
> > > > stepping: 0x3) CPU. Sometimes I'll only see 3 RAPL counters
> > > > instead
> > > > of
> > > > the normal 4. (It used to happen a lot more often, BTW):
> > > >
> >
> > That is because sometimes the counter for PP1 (GFX ..) is 0 during
> > boot
> > and then the PMU code will ignore that. This happens when the
> > counter
> > is sampled before GPU is not even started. So this is a race
> > condition.
>
> Is there anything that should/could be done about it?
>
Not an easy solution at this time without ignoring 0s.
> What's the effect of not having a GPU RAPL available?
>
The package level counter already includes this. So unless looking for
only GPU counter, not much effect.
Thanks,
Srinivas
> > Thanks,
> > Srinivas
> >
> >
> > > > ----
> > > > gunzip --force --stdout /var/log/syslog* | fgrep -i rapl |
> > > > fgrep
> > > > fixed
> > > > 2025-09-08T12:09:05.915989-07:00 xps-9320 kernel: [ T1] RAPL
> > > > PMU: API
> > > > unit is 2^-32 Joules, 3 fixed counters, 655360 ms ovfl timer
> > > > 2025-09-09T08:52:19.098522-07:00 xps-9320 kernel: [ T1] RAPL
> > > > PMU: API
> > > > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > > > 2025-09-09T17:25:24.377784-07:00 xps-9320 kernel: [ T1] RAPL
> > > > PMU: API
> > > > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > > > 2025-09-09T17:50:09.334140-07:00 xps-9320 kernel: [ T1] RAPL
> > > > PMU: API
> > > > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > > > 2025-09-10T16:42:13.259270-07:00 xps-9320 kernel: [ T1] RAPL
> > > > PMU: API
> > > > unit is 2^-32 Joules, 3 fixed counters, 655360 ms ovfl timer
> > > > 2025-09-10T16:46:36.322016-07:00 xps-9320 kernel: [ T1] RAPL
> > > > PMU: API
> > > > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > > > 2025-09-02T13:05:02.632218-07:00 xps-9320 kernel: [ T1] RAPL
> > > > PMU: API
> > > > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > > > 2025-09-02T14:07:19.683466-07:00 xps-9320 kernel: [ T1] RAPL
> > > > PMU: API
> > > > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > > > 2025-09-02T14:20:43.602483-07:00 xps-9320 kernel: [ T1] RAPL
> > > > PMU: API
> > > > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > > > 2025-09-04T13:13:38.636326-07:00 xps-9320 kernel: [ T1] RAPL
> > > > PMU: API
> > > > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > > > 2025-09-05T09:21:50.147180-07:00 xps-9320 kernel: [ T1] RAPL
> > > > PMU: API
> > > > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > > > 2025-08-29T10:57:14.419740-07:00 xps-9320 kernel: [ T1] RAPL
> > > > PMU: API
> > > > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > > > 2025-08-17T11:52:55.733943-07:00 xps-9320 kernel: [ T1] RAPL
> > > > PMU: API
> > > > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > > > 2025-08-19T07:52:30.696326-07:00 xps-9320 kernel: [ T1] RAPL
> > > > PMU: API
> > > > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > > > 2025-08-19T07:55:49.083600-07:00 xps-9320 kernel: [ T1] RAPL
> > > > PMU: API
> > > > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > > > 2025-08-20T10:53:54.601680-07:00 xps-9320 kernel: [ T1] RAPL
> > > > PMU: API
> > > > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > > > 2025-08-20T11:00:09.560496-07:00 xps-9320 kernel: [ T1] RAPL
> > > > PMU: API
> > > > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > > > 2025-08-20T11:12:30.580414-07:00 xps-9320 kernel: [ T1] RAPL
> > > > PMU: API
> > > > unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> > > > ----
> > > >
> > > > ... and it's always(?) the GPU RAPL:
> > > >
> > > > ----
> > > > gunzip --force --stdout /var/log/syslog* | fgrep -i rapl | cut
> > > > -d\]
> > > > -f2-
> > > > > sort -f | uniq -c
> > > > grep: (standard input): binary file matches
> > > > 18 intel_rapl_common: Found RAPL domain core
> > > > 36 intel_rapl_common: Found RAPL domain package
> > > > 18 intel_rapl_common: Found RAPL domain psys
> > > > 16 intel_rapl_common: Found RAPL domain uncore
> > > > 18 intel_rapl_msr: PL4 support detected.
> > > > 2 RAPL PMU: API unit is 2^-32 Joules, 3 fixed
> > > > counters,
> > > > 655360
> > > > ms ovfl timer
> > > > 16 RAPL PMU: API unit is 2^-32 Joules, 4 fixed
> > > > counters,
> > > > 655360
> > > > ms ovfl timer
> > > > 18 RAPL PMU: hw unit of domain package 2^-14 Joules
> > > > 18 RAPL PMU: hw unit of domain pp0-core 2^-14 Joules
> > > > 16 RAPL PMU: hw unit of domain pp1-gpu 2^-14 Joules
> > > > 18 RAPL PMU: hw unit of domain psys 2^-14 Joules
> > > > ----
> > > >
> > > > A reboot fixes it up again (and that's if I even notice), but
> > > > what
> > > > would
> > > > cause this to happen? What's the effect of it missing the RAPL
> > > > counter, BTW?
> > > >
> > > > LMK if you need more info,
> > > >
> > > > -Kenny
> > > >
> > > > --
> > > > Kenneth R. Crudup / Sr. SW Engineer, Scott County Consulting,
> > > > Orange
> > > > County CA
> > > >
> > > >
> >
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2025-09-11 20:11 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
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2025-09-11 0:20 Sometimes I only see 3 RAPL (out of 4) Counters Kenneth Crudup
2025-09-11 9:42 ` Rafael J. Wysocki
2025-09-11 18:37 ` srinivas pandruvada
2025-09-11 18:40 ` Kenneth Crudup
2025-09-11 20:11 ` srinivas pandruvada
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