[Bug 76877] New: [BYT]Sysfs RC6 residency counter is inaccurate
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Mon Mar 31 21:03:03 PDT 2014
https://bugs.freedesktop.org/show_bug.cgi?id=76877
Priority: medium
Bug ID: 76877
CC: intel-gfx-bugs at lists.freedesktop.org
Assignee: intel-gfx-bugs at lists.freedesktop.org
Summary: [BYT]Sysfs RC6 residency counter is inaccurate
QA Contact: intel-gfx-bugs at lists.freedesktop.org
Severity: normal
Classification: Unclassified
OS: All
Reporter: wendy.wang at intel.com
Hardware: Other
Status: NEW
Version: unspecified
Component: DRM/Intel
Product: DRI
Test on BYT with kernel: 3.14.0-rc8_drm-intel-nightly_19f629_20140331+
Run below script:
BEFORE=`cat /sys/class/drm/card0/power/rc6_residency_ms`
time sleep 10
AFTER=`cat /sys/class/drm/card0/power/rc6_residency_ms`
echo BEFORE = $BEFORE
echo AFTER = $AFTER
DELTA=$((AFTER - BEFORE))
echo DELTA = $DELTA
echo "scale=2; ($DELTA / 1000) / 10" | bc -l
Show the result:
real 0m10.002s
user 0m0.000s
sys 0m0.002s
BEFORE = 1281484
AFTER = 1292928
DELTA = 11444
1.14
So there should be something is wrong with Sysfs RC6 residency counter on BYT.
Cannot reproduce this issue on HSW and IVB platform.
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