Originally posted by wargames
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Intel Releases Linux Thermal Daemon
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Originally posted by wargames View PostQuick question: why don't they just patch the current cpufreq subsystem ? Why reinvent the wheel ?
Last question: that daemon runs in user space ? How efficient is that ? do we really a daemon for something that can be done by the kernel ?
The upside to this, and not using just the cpufreq subsystem is we can use both. We can tell cpufreq "Use the ondemand governor." and then tell the Daemon "80 degrees max." So until the CPU starts hitting the high temps, you're getting the full performance of the CPU. And the daemon will only kick in if needed.
As far as why isn't it kernel space... I'm guessing the temperature reading is likely being handled by lm_sensors and then the daemon just continually checks the output of 'sensors', if that was done in kernel there'd be no way to guarantee lm_sensors existence, also everytime it'd go to check the temperature, wouldn't there be a context switch from kernel to userspace and back to kernel?All opinions are my own not those of my employer if you know who they are.
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Originally posted by Ericg View PostThere's a reason the only options are: OnDemand, Performance, Powersave, and Conservative (and Userspace, but ive never seen that one get used o.O).
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Originally posted by GreatEmerald View PostIt gets used all the time... from userland. It's just not set by default, because you need to have a userland daemon that would implement its own governor for it, and it's not available early during boot. One such a daemon is launched, it can manually set the governor to "userspace".All opinions are my own not those of my employer if you know who they are.
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Selling Hardware that don't gives the power that's described in the advertising sounds like a fraud to me.
And thermal control should be done outside of a maybe crashed OS.
What happens to your warranty if your device gets damaged because of a crashed OS ? Is your warranty
void because you are using a non certified OS with a given patch level and non certified applications ?
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Originally posted by dibal View PostSelling Hardware that don't gives the power that's described in the advertising sounds like a fraud to me.
And thermal control should be done outside of a maybe crashed OS.
What happens to your warranty if your device gets damaged because of a crashed OS ? Is your warranty
void because you are using a non certified OS with a given patch level and non certified applications ?All opinions are my own not those of my employer if you know who they are.
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Originally posted by dibal View PostDevices that need help from the OS to not being physical destroyed are crap.
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Originally posted by dibal View PostDevices that need help from the OS to not being physical destroyed are crap.All opinions are my own not those of my employer if you know who they are.
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Originally posted by dibal View PostDevices that need help from the OS to not being physical destroyed are crap.
When those protections trigger, they trigger hard, and performance suffers a LOT.
This is about avoiding the hardware triggers, by sacrificing a little bit of performance once things get hot... to avoid the much more severe performance impact of having hardware triggers.
In addition, this allows setting the temperature below the point where the fan would come on (if the user so wishes) so that you can run silent etc etc.
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