Processor Power limit problem on Debian.

[Haswellx86]

My PL1 is 15 watts and PL2 is 30 watts. Upon monitoring, it looks like my CPU power only stays within PL1. My BIOS doesn't provide much power related settings. What is the problem?

[Eigenvektor]

What output do you get from

cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor

 

[Haswellx86]

@Eigenvektor

 

"powersave" written 8 times. Hm I do have 8 threads.

[Haswellx86]

@Eigenvektor

 

I did manage to change it to performance, so now even on idle it boosts to 4.2 GHz, but it still limits the power to 15 watts.

[Eigenvektor]

6 minutes ago, Gat Pelsinger said:

"powersave" written 8 times. Hm I do have 8 threads.

Yes, there's a * in the path, so it'll give you the output for all CPUs (cores/threads). That means the power governor for your CPU is "powersave", so it'll run at the lowest possible power.

 

https://wiki.debian.org/CpuFrequencyScaling

 

You'll want to set that to "conservative" or maybe "ondemand". Personally, I prefer "conservative", because it means things generally stay less noisy. Meanwhile "ondemand" is more aggressive and will scale up a lot sooner.

[Haswellx86]

@Eigenvektor

 

dang it, I knew you wouldn't read my latest reply. I was only 1 minute off! 

[Eigenvektor]

45 minutes ago, Gat Pelsinger said:

dang it, I knew you wouldn't read my latest reply. I was only 1 minute off! 

I'm afraid I don't know how to change the power limit, outside of changing the CPU's governor. How are you measuring it anyway? Are you sure that reading is correct?

[Ralphred]

3 hours ago, Eigenvektor said:

or maybe "ondemand"

"ondemand" has been kinda deprecated by "schedutil" - it's supposed to be quicker to react or something.

[Arokan]

my output is "schedutil" oO What the hell is that?

 

Edit: Wrote that two hours ago, didn't send until now, refreshed, nevermind!

[Haswellx86]

3 hours ago, Eigenvektor said:

I'm afraid I don't know how to change the power limit, outside of changing the CPU's governor. How are you measuring it anyway? Are you sure that reading is correct?

I am using the Intel RAPL tools. I am sure it is reading correct because my clock speed and temps match my power consumption, monitored through CPU-X.