http://defect.opensolaris.org/bz/show_bug.cgi?id=8873
Summary: Yet another c-state residency bug
Classification: Development
Product: power-mgmt
Version: unspecified
Platform: ANY/Generic
OS/Version: All
Status: NEW
Severity: minor
Priority: P4
Component: powertop
AssignedTo: rafael.vanoni at sun.com
ReportedBy: aubrey.li at intel.com
CC: tesla-dev at opensolaris.org, bill.holler at sun.com
Created an attachment (id=1926)
--> (http://defect.opensolaris.org/bz/attachment.cgi?id=1926)
fix c-state residency issue
Currently, powertop reports 10% C0 residency in idle
on NHM-EP.
==========================================
C-states Avg residency
C0 (cpu running) (10.0%)
C1 3.1ms (5.1%)
C2 0.0ms (0.0%)
C3 4.4ms (84.9%)
==========================================
It doesn't make sense 10% CPU run time when idle.
This is caused by the buggy dtrace script.
The aggregation number ignored by dtrace script
is obvious to the idle C0 residency.
After fix it, powertop report:
==========================================
C-states (idle power states) Avg residency
C0 (cpu running) (0.4%)
C1 4.0ms (5.8%)
C2 0.0ms (0.0%)
C3 4.9ms (93.7%)
==========================================
Patch is attached.
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