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cpufrequtils: the Linux answer to P5 state throttling (Kaveri)?

post #1 of 15
Thread Starter 
So I finally got myself a Kaveri chip (will post more on it later once it's overclocked, might take awhile). The first thing I wanted to do was figure out how to defeat CPU throttling during heavy GPU load under Linux (this procedure is already well-documented in Windows: just use msr tweaker). turionpowercontrol looked like it offered the most logical solution, but it turns out the regularly-available version of the program does not appear to recognize Kaveri chips. I certainly haven't figured out how to make it work.

There are some indications that a newer version of turionpowercontrol exists somewhere (tpc-0.44-mod-r001), but I'll be darned if I know where to get it.

Anyway, I figured there had to be something out there that could help Kaveri to not throttle. What I found was cpufrequtils. It's readily available in the standard Ubuntu repos (I'm running Lubuntu 14.10), and getting it to work is as simple as making sure you have C1E/PowerNow enabled. Right now I have my 7700k locked at 3.4 ghz/720 mhz iGPU with stock vcore, so the following commands kept my chip from throttling under any condition:

sudo cpufreq-set -c0 -g userspace (repeat this command for c1, c2, and c3)

then

sudo cpufreq-set -c0 -f 3400Mhz (repeat as above)

Obviously you'll need to do this in a terminal.

You can also use cpufreq-info to get a breakdown of where your cores are clocked at right now and what percentage of uptime they've spent at various available clockspeeds. I knew that P5 state throttling wasn't happening since my 7700k spent 0.01% of the time at 2800 mhz, which is its P5 state speed. I ran Unigine Heaven 4.0 1.5.3 via Phoronix Test Suite 5.2.1, and the CPU frequency did not budge from 3400 mhz.

Now, maybe it's just that Heaven doesn't tax the iGPU enough, or maybe it's because I haven't pushed the socket beyond its power limits that I am not experiencing throttling. So I'll have to rerun my tests after overclocking to see what's up. But, so far as I can tell, cpufrequtils is doing the job. You have to re-run the terminal commands each time you start up your machine, but hey, you can always put together a shell script to handle it. No big whoop.

Phoronix did some scaling tests using their own benchmark suite to show throttling behavior under cpufrequtils' different governors (they omitted userspace), and it should be pretty obvious that throttling under the performance governor is also pretty limited. I experienced no noticeable throttling re-running Unigine under the performance governor.

Thought this might be of some interest for you Kaveri owners out there that are concerned about throttling behavior. Yes, you can get around it in Linux just as easily as you can in Windows, if a bit inelegantly.
post #2 of 15
Thread Starter 
Just an update, but I pushed all my components (CPU, RAM, NB, iGPU) as hard as I could and cpufreq-utils still prevents the chip from throttling due to iGPU utilization.

My current "max out" point is:

CPU: 4.5 ghz
NB: 2.0 ghz
iGPU: 1028 ghz
RAM: DDR3-2400 10-12-13-8 2T

It doesn't throttle at all, for any reason. It just gets really, really hot. 67C under y-cruncher, yow. If/when I delid/relid and get the temps down, I'll try for 4.6ghz or higher and see if I get any throttling in that territory.
post #3 of 15
Hi there drmlordx,

Sorry for the thread necro here. This is seriously one of the only posts on the whole of the interwebs addressing this issue from a linux perspective. I think its worth a bump. Perhaps I can pick your brain a bit if you have a chance....


Doesn't seem to matter what settings I use, I have not found any way to defeat the "3ghz" throttle when the iGPU is used for any sort of render/openGL/viewport operation in linux. I'd really like to find a solution to this. Working with an A10-7850K on a GIGABYTE GA-F2A88XN-WIFI with F6 BIOS. Manjaro Linux, Kernel 4.1.

The throttling doesn't have anything to do with TDP or temperatures (I'm sure you already know this).

My distro uses cpupower rather than cpufreq utilities, but they control the same thing so shouldn't matter (different toolset for the same underlying software). I've tried userspace governor with manually set P-states and minimum frequencies, as well as the performance governor. This takes effect just fine (confirmed via cpupower frequency-info, and Mperf, which actually calculates true CPU clock speed) , but as soon as I put a load on the iGPU, Mperf (cpupower monitor) calculates ~3GHZ on all cores. Cpufreq-info (I use cpupower frequency-info, same thing), does not show any usage at the 3.0GHZ power state, even though it is clearly running at 3GHZ as calculated by Mperf. This leads me to believe that your A10-7700K may well have been throttling, but you may have been mislead by cpufreq-info into believing that it did not throttle.

Thoughts?

I'm looking for a way to actually modify a P-State, as this is probably the only way to truly defeat the throttling. Any experience with this?
     
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post #4 of 15
^ Mdocod! Welcome back! Good to see you again in the forum!
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post #5 of 15
Hey there UnderVolter!

Long time!

Thanks for the warm welcome wink.gif
     
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post #6 of 15
Thread Starter 
Hmmmm, intriguing. You make me want to go back and take another crack at getting my CPU to throttle in Linux ala Windows. More later once I get a chance to generate some relevant results . . .

also, I have no experience with actually modifying p-states under Linux. I've used amdmsrtweaker under Windows 7 and Windows 10, but nothing of the sort in Linux land. I did look it up awhile back, and apparently there is a complicated way to pull it off, I just don't remember where I saw it . . .

edit: well crap, it looks like cpufreq-info is totally lying about clockspeeds, and so is Conky!

I went and got the latest phoronix test suite, and used GpuTest option 1 (Furmark), windowed in 1024x768. Alone it uses up 2% CPU time, so it leaves a lot of CPU left over for something else . . . namely, single-threaded y-cruncher, which should co-exist perfectly with Furmark considering it's only taking up 2% CPU time on its own.

So, @ 4.5 GHz (same settings as above, though lower voltage now that I've delidded and my temps are down)

y-cruncher 25m, single thread, no Furmark: 14.592s
y-cruncher 25m, single thread, Furmark: 22.943s

Well crap. That reduction in performance can not be blamed on something using up only 2% CPU time. It CAN be blamed on the CPU throttling from 4.5 GHz to 2.8 GHz. Back to the drawing board on Linux!

Hmm, check this out. Maybe we can adapt something like this to 15h?

https://wiki.archlinux.org/index.php/K10ctl
Edited by drmrlordx - 1/22/16 at 9:00pm
post #7 of 15
Well bugger!! Yea I had a feeling cpufreq-info may have caused some confusion here.

I appreciate you going back and trying this again for me. I'm going to keep tinkering with this issue. I'll let you know if I figure anything out. I did run across that K10CTL, but I wouldn't have a clue how to go about modifying that to work for this. I'm no software engineer.

Thanks!

Eric
     
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post #8 of 15
Thread Starter 
I'm getting closer to a solution:

https://github.com/tud-zih-energy/k15ctl

check that out
post #9 of 15
So you recon this is something we must remedy?
post #10 of 15
Nice find there drmlordx.

Doesn't say anything about FM2+, but I'm willing to give it a try.....


The Stilt,

Yea, in the spirit of overclock.net, it's a shame to be running 3.0GHZ on these chips anytime the iGPU is engaged in any sort of viewport-render operation. I sure would like to find a remedy. I could just toss a discrete GPU in there, disable the iGPU, problem solved, but the tinkerer in me would rather go about this the hard but free way.

Everyone always says these APU's are going to be iGPU bound in gaming so the CPU clock speed doesn't matter, but in my experience performance originates with the CPU in gaming, and GPU performance manifests as the ability to run higher visual quality settings. For a lot of the types of games we like to play, the APU can easily run decent visual quality settings at 1080P, and they still wind up CPU bottlenecked, especially in congested and/or high unit count conditions.
Edited by mdocod - 1/24/16 at 5:01pm
     
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