Created attachment 108936 [details] dmesg ==System Environment== -------------------------- Regression: not sure Non-working platforms: BSW ==kernel== -------------------------- drm-intel-nightly/f56717bdf29eb7d6a9ec15f095ea2a6858895473 ==Bug detailed description== -------------------------- It sporadically fails on BSW with -nightly kernel, fail rate:1/8. output: IGT-Version: 1.8-ge622850 (x86_64) (Linux: 3.18.0-rc3_drm-intel-nightly_f56717_20141105+ x86_64) The residency counter: 1.000333 Test assertion failure function residency_accuracy, file pm_rc6_residency.c:129: Failed assertion: (flag_counter != 0) && (counter_result <=1) Sysfs RC6 residency counter is inaccurate. Subtest rc6-accuracy: FAIL (0.000s) ==Reproduce steps== ---------------------------- 1. ./pm_rc6_residency --run-subtest rc6-accuracy
Assigning to Wendy since that subtest is from her. From a quick look it makes assumptions about timeouts that don't really hold true always.
BSW RC6 residency accuracy problem is similar as BYT known bug: Bug 76877 - [HSW/BYT]Sysfs RC6 residency counter is inaccurate Base on Jesse's feedback in bug 76877, also close this bug as will not fix. "There are a few things going on here: - the rc6 residency counters don't have a high precision (some of the data feeding into it is only updated at 1ms intervals) - reading from userspace introduces potential error, since the reads may occur further apart than the "time" and "sleep" commands indicate due to scheduling etc. So I'm closing this as WONTFIX. We'll have to tolerate some imprecision in these counters. Since they're for debug only, that should be fine."
*** This bug has been marked as a duplicate of bug 76877 ***
Closing old verified.
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