https://github.com/torvalds/linux
Revision e66c176837462928a05a135bbe16cdce70536d6e authored by Dirk Brandewie on 25 February 2014, 18:35:37 UTC, committed by Rafael J. Wysocki on 25 February 2014, 23:56:49 UTC
Commit fcb6a15c2e (intel_pstate: Take core C0 time into account for core busy calculation) introduced a regression on some processor SKUs supported by intel_pstate. This was due to the truncation caused by using integer math to calculate core busy and C0 percentages. On a i7-4770K processor operating at 800Mhz going to 100% utilization the percent busy of the CPU using integer math is 22%, but it actually is 22.85%. This value scaled to the current frequency returned 97 which the PID interpreted as no error and did not adjust the P state. Tested on i7-4770K, i7-2600, i5-3230M. Fixes: fcb6a15c2e7e (intel_pstate: Take core C0 time into account for core busy calculation) References: https://lkml.org/lkml/2014/2/19/626 References: https://bugzilla.kernel.org/show_bug.cgi?id=70941 Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1 parent cfbf8d4
Tip revision: e66c176837462928a05a135bbe16cdce70536d6e authored by Dirk Brandewie on 25 February 2014, 18:35:37 UTC
intel_pstate: Change busy calculation to use fixed point math.
intel_pstate: Change busy calculation to use fixed point math.
Tip revision: e66c176
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