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Created attachment 1123676 [details] failure results Description of problem: Hardware CPU scaling cert fails when Intel cpu pstate is enabled Version-Release number of selected component (if applicable): 7.x How reproducible: Steps to Reproduce: 1.Run rhcert tool to test cpu scaling 2. 3. Actual results: Expected results: Additional info: Test suite should be enhanced to assume intel pstate is on.
Comments from our development team The documentation seems to indicate the the test is using the file /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies for find the available freqs for the test. That file is not present in the QA host running RHEL 7.2 There is a driver that is compiled by default with the RHEL 7.2 kernel. The driver is named INTEL_PSTATE. If I disable this driver using the kernel command line parameter 'intel_pstate=disable' then the file 'scaling_available_frequencies' is present in the system. Re-running the scaling test with the intel_pstate driver disabled it passes the test. So, given this result we need to ask RedHat about running this test on RHEL 7.2. Their default kernel for this version of the OS is coming with the intel_pstate driver enabled. We also see that the frequencies/scaling frequencies files and their contents under '/sys/devices/system/cpu/cpuX/cpufreq' in RHEL 7.2 and RHEL 6.7 are similar when the intel_pstate driver is disabled.
Are you still experiencing this issue with the latest released redhat-certification-backend, redhat-certification, and redhat-certification-hardware packages? Thanks