AMD turbo core not working?

Uruz42 · 10-20-2015, 07:49 AM

Hey folks,
I'm having some trouble with getting my cpu (amd A10-6800K) to get boosting to turbo boost. I have it activated in my bios (MoBo: Asrock FM275A Pro4+). Im running cli debian on it.

When running idle the cpu runs at 2.00Ghz according to cpufreq-info (1968000kHz according to cpufreq-aperf).
When running cpuburn on 4 threads I get a frequency of 4.10 Ghz on every core according to cpufreq-info (3977000kHz according to cpufreq-aperf)
When running cpuburn on 1 thread only I get a frequency of 4.10 Ghz on one core according to cpufreq-info. But at the same time cpufreq-aperf reads:

Code:

CPU     Average freq(KHz)       Time in C0      Time in Cx      C0 percentage
000     1968000                 00 sec 040 ms   00 sec 959 ms   04
001     1968000                 00 sec 012 ms   00 sec 987 ms   01
002     4264000                 00 sec 002 ms   00 sec 997 ms   00
003     4264000                 00 sec 998 ms   00 sec 001 ms   99

The boost clock should be 4.4Ghz according to the CPU specs.
So I'm wondering if that last case is the turbo core, because it's not that close to the specified turbo frequency. Also the frequency when under load at all 4 cores is lower then specified.

So first of all im not shure if I actually have a problem but to me it seems like either turbo core is'nt working, or all clock speeds are lower then they should be.
So are these speeds actually correct? if not, where to find correct ones, if they are why are they so low?

Thanks in advance for any help

maples · 10-20-2015, 12:31 PM

I have an Intel laptop CPU that has a similar "turbo boost" feature.

As I understand, the CPU adjusts the processor speed not just based on load, but things like temperature as well. I don't know the exact numbers off the top of my head, but let's say that it's advertised at 2.6 GHz. When I do something like ffmpeg using all cores at 100, it usually hovers around 2.1, 2.2 GHz. But when I put it on a laptop cooling pad (or take other measures to lower its temperature) the speed goes up. It seems that it likes to keep its temperature under 65C.

What are your temperatures like when you're running the tests? If they're warmer than usual, see what you can do to increase cooling.

Uruz42 · 10-20-2015, 03:24 PM

Temperatures are quiet good, under 55C