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Date: Tue, 19 Dec 2017 18:30:11 +0000 From: Marc Zyngier <marc.zyngier@....com> To: Viresh Kumar <viresh.kumar@...aro.org>, Catalin Marinas <catalin.marinas@....com> Cc: Vincent Guittot <vincent.guittot@...aro.org>, arm@...nel.org, Will Deacon <will.deacon@....com>, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org Subject: Re: [PATCH] arm64: defconfig: Select schedutil as default cpufreq governor On 18/12/17 04:29, Viresh Kumar wrote: > On 15-12-17, 15:50, Catalin Marinas wrote: >> On Thu, Nov 16, 2017 at 11:51:36AM +0530, Viresh Kumar wrote: >>> Currently performance governor is getting selected by default, which is >>> surely not a very good choice as its pretty much power hungry. >>> >>> Select schedutil instead. >> >> And why do we care about this in defconfig? People deploying their own >> kernels in mobile may opt for this config, others may prefer the default >> governor. >> >> Also it seems it would be the only architecture make this governor the >> default, so NAK. > > This is a bit dangerous configuration IMHO. > > Other architectures have some *real* governor selected by default, like Ondemand > or Conservative. Running your CPUs at max (because of the default performance > governor in arm64 config) may end up burning some SoCs accidentally just because > their thermal stuff doesn't kick in to cool SoC down properly. Honestly, this feels like widening a road because someone wants to drive a car with no steering wheel. If an SoC is broken enough not to to into thermal throttling on its own, I'm tempted to say "let it burn". And on-demand is just as bad as performance in that respect, as it will to the same thing as soon as you run (for example) Firefox. Or Emacs. > So, we should have one of ondemand, conservative and schedutil selected by > default for arm64 as well IMO and schedutil is the one which every one is > falling back to now a days, even android. I'll have my bike shed painted pink, thank you very much! :-) M. -- Jazz is not dead. It just smells funny...
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