blob: f20fb445135d31953db86edccacca29c519fbf69 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
Collaborative Processor Performance Control (CPPC)
CPPC defined in the ACPI spec describes a mechanism for the OS to manage the
performance of a logical processor on a contigious and abstract performance
scale. CPPC exposes a set of registers to describe abstract performance scale,
to request performance levels and to measure per-cpu delivered performance.
For more details on CPPC please refer to the ACPI specification at:
http://uefi.org/specifications
Some of the CPPC registers are exposed via sysfs under:
/sys/devices/system/cpu/cpuX/acpi_cppc/
for each cpu X
--------------------------------------------------------------------------------
$ ls -lR /sys/devices/system/cpu/cpu0/acpi_cppc/
/sys/devices/system/cpu/cpu0/acpi_cppc/:
total 0
-r--r--r-- 1 root root 65536 Mar 5 19:38 feedback_ctrs
-r--r--r-- 1 root root 65536 Mar 5 19:38 highest_perf
-r--r--r-- 1 root root 65536 Mar 5 19:38 lowest_freq
-r--r--r-- 1 root root 65536 Mar 5 19:38 lowest_nonlinear_perf
-r--r--r-- 1 root root 65536 Mar 5 19:38 lowest_perf
-r--r--r-- 1 root root 65536 Mar 5 19:38 nominal_freq
-r--r--r-- 1 root root 65536 Mar 5 19:38 nominal_perf
-r--r--r-- 1 root root 65536 Mar 5 19:38 reference_perf
-r--r--r-- 1 root root 65536 Mar 5 19:38 wraparound_time
--------------------------------------------------------------------------------
* highest_perf : Highest performance of this processor (abstract scale).
* nominal_perf : Highest sustained performance of this processor (abstract scale).
* lowest_nonlinear_perf : Lowest performance of this processor with nonlinear
power savings (abstract scale).
* lowest_perf : Lowest performance of this processor (abstract scale).
* lowest_freq : CPU frequency corresponding to lowest_perf (in MHz).
* nominal_freq : CPU frequency corresponding to nominal_perf (in MHz).
The above frequencies should only be used to report processor performance in
freqency instead of abstract scale. These values should not be used for any
functional decisions.
* feedback_ctrs : Includes both Reference and delivered performance counter.
Reference counter ticks up proportional to processor's reference performance.
Delivered counter ticks up proportional to processor's delivered performance.
* wraparound_time: Minimum time for the feedback counters to wraparound (seconds).
* reference_perf : Performance level at which reference performance counter
accumulates (abstract scale).
--------------------------------------------------------------------------------
Computing Average Delivered Performance
Below describes the steps to compute the average performance delivered by taking
two different snapshots of feedback counters at time T1 and T2.
T1: Read feedback_ctrs as fbc_t1
Wait or run some workload
T2: Read feedback_ctrs as fbc_t2
delivered_counter_delta = fbc_t2[del] - fbc_t1[del]
reference_counter_delta = fbc_t2[ref] - fbc_t1[ref]
delivered_perf = (refernce_perf x delivered_counter_delta) / reference_counter_delta
|
