[LAU] Hardware timers?

david gnome at hawaii.rr.com
Wed Sep 2 07:18:39 CEST 2020

On 9/1/20 12:41 PM, Roger wrote:
> On 2/9/20 4:14 am, Mac wrote:
>> On Mon, Aug 31, 2020 at 7:17 AM Roger <gurusonic at gmail.com 
>> <mailto:gurusonic at gmail.com>> wrote:
>>     I'm just experimenting with new setups of Debian for audio. When
>>     running
>>     RealtimeConfigQuickScan it triggered a vague recollection of a
>>     discussion (here?) that configuring hpet and rtc timers is no longer
>>     necessary as they are not used any more. Is this true or am I
>>     misremembering?
>>     The wiki guide at
>>     https://wiki.linuxaudio.org/wiki/system_configuration
>>     is still a goldmine for setup but it contains some sections of
>>     which I
>>     am unsure whether they are still applicable, including the HW
>>     timers bit.
>> Hmm...doing similar, but, I can't get the cpu frequency to stay set 
>> between boots...
> I get around that by using Liquorix kernel which I think is hard coded 
> to use performance governor. The wiki doesn't mention what to do if 
> scaling driver is intel_pstate although from reading it's possible to 
> disable that and load acpi-cpufreq scaling driver instead which is 
> needed to be able to set the governor to performance AFAIK. There are 
> several pertinent questions on StackOverflow discussing that, like - 
> https://stackoverflow.com/questions/53349933/specify-cpu-frequency-as-a-kernel-cmd-line-parameter-of-linux-on-boot/53356512
I don't remember what I did on my old i7 to keep it on performance. One 
involved having to push the performance setting to EACH CPU/thread, I 
think that's covered on that link somewhere. May have been a script. I 
don't remember how I did it, but it stuck between boots. I think I 
actually tried three different things, so I really don't know which one 
did the trick.

I haven't done it on my present i9. Laptops aren't really good homes for 
the i9 - needs a whole lot more airflow than a laptop can provide. 
Running at 900MHz right now and 115F.

> Back to HW timers, it's trivial to set them as explained in the wiki, 
> but I'm just wondering if they are actually still used?
Don't know about that. Wasn't that something that had to be set in the 
kernel at compile time?

David W. Jones
gnome at hawaii.rr.com
authenticity, honesty, community
"My password is the last 8 digits of π."

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