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Message-ID: <5615834C.80108@redhat.com> Date: Wed, 07 Oct 2015 16:40:44 -0400 From: Prarit Bhargava <prarit@...hat.com> To: Doug Smythies <dsmythies@...us.net> CC: "'Kristen Carlson Accardi'" <kristen@...ux.intel.com>, linux-kernel@...r.kernel.org, "'Viresh Kumar'" <viresh.kumar@...aro.org>, linux-pm@...r.kernel.org, "'Rafael J. Wysocki'" <rjw@...ysocki.net> Subject: Re: [PATCH] cpufreq, intel_pstate, set max_sysfs_pct and min_sysfs_pct on governor switch On 10/07/2015 02:52 PM, Doug Smythies wrote: > On 2015.10.07 08:46 Prarit Bhargava wrote: >> On 10/07/2015 11:40 AM, Doug Smythies wrote: >>> >>> Do we agree or disagree that the root issue seems to be (from your test)?: >>> >>> \# echo 100 > /sys/devices/system/cpu/intel_pstate/min_perf_pct >>> >>> [ 21.483436] store_min_perf_pct[453] min_sysfs_pct = 100 >>> [ 21.489373] store_min_perf_pct[456] min_perf_pct = 100 >>> [ 21.495203] store_min_perf_pct[459] min_perf_pct = 100 >>> [ 21.501050] store_min_perf_pct[462] min_perf_pct = 100 >> >> Yep, and it appears to be done by default in Fedora & RHEL :/ ... the issue is >> still the same IMO that min_sysfs_pct & max_sysfs_pct are not cleared on a >> governor switch. > > Clearing them will break some other things. For example, and as > shown in my original reply, resume from suspend. > > Why? Because, at least on my computer, the governor is changed to > "performance" during suspend, and the "powersave" governor is > restored sometime during resume. The users wants the settings they had > before the suspend. Hmm ... okay. I'm going to try again with a new patch and I'll add an additional test of starting with the powersave governor, changing the min_perf_pct, and then doing a suspend/resume. P. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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