New tool: AmdMsrTweaker

[cab]

The new release supporting Trinity is now online. I started a new thread here: http://www.xtremesystems.org/forums/...r-New-Versions

Not for now. But it is definitely something to look into. But I'd have to at least rewrite the class that uses WinRing0 on Windows to write the MSRs.

AMD has published everything so far, boosted P-state Pb0 is disabled in Trinity laptops, so they might overheat if used. Here's what I get on my A8-4500M:

$ sudo k10ctl 0 
Warning: No AMD Family 10h processor
VID interface mode: serial

CPU0
Current P-State: 4      Fastest P-State: 1
               NbVid   NbDid  CpuVid  CpuDid  CpuFid           UNb   CpuMult      UCpu     PCore
P-State 0:         0       0      66       0       7      1550.0mV  11.50000   725.0mV    6525mW
P-State 1:         0       0      66       0       7      1550.0mV  11.50000   725.0mV    6525mW
P-State 2:         0       0      84       0       3      1550.0mV   9.50000   500.0mV    2800mW
P-State 3:         0       0      92       0       2      1550.0mV   9.00000   400.0mV    2000mW
P-State 4:         0       0     100       0       1      1550.0mV   8.50000   300.0mV    1290mW
Low Limit:       124       1     124                         0.0mV   0.50000     0.0mV
High Limit:        0       1       0                      1550.0mV  14.00000  1550.0mV
Target:           42       1     108       1      12      1025.0mV   7.00000   200.0mV
Current:          40       0     108       1      12      1050.0mV   7.00000   200.0mV

[MarcusBSN]

Well, a few things:

• Given the changes to Fam15 CPUs, especially the APU derivatives, it's no wonder the output doesn't make too much sense
• The PDF you linked is for Fam10 (Athlon, Phenom), not Trinity. But I would have the docs needed, just in case.
• k10ctl is written in Pascal. I would like to avoid that programming language, even if I have some experience in it (quite a while ago).

I can understand your desire to have such a tool for Linux as well. It's just that at the moment I lack the time to write such a tool from scratch or even just write the low level access layer for AmdMsrTweaker (apart from that some Windows-specific calls would have to be replaced too).

If you are really hardcore, you could use the rdmsr and wrmsr tools available on Linux. You would have to use the tech docs to figure which value needs to go to which register, which can be quite the pain if done manually. Also some settings are in the PCI configuration space. I dunno if those programs can write there. On the upside, those registers are actually exposed via the /dev and /proc filesystems on Linux.

[cab]

Yea the PDF is for 10h only, I thought it would help you to know that AMD does publish a complete developer’s guide.

Everything is wrong in my table above, he’s even using 200 muliplier, but he’s still fetching the same values as PSCheck, so he’s half-way there

Does the language matter? It would be a very small app. My understanding is that you just put the values in the registers and the CPU does all the work after that. AMD is very conservative with their stock voltages, so it would be nice to undervolt, with 8 cores the power savings will add up.

[MarcusBSN]

Thank you for trying to be helpful. I have those guides, otherwise I wouldn't have been able to update the tool for Trinity

Basically you are right. However, doing it in Pascal is a pain and you need to consider a lot of things that are different across families. So yes, the source code of k10ctl is a starting point, but it would take quite some time to get familiar with it. Time I don't have at the moment.

[Punisher!]

Link has expired. Is it possible to download it anywhere?

[MarcusBSN]

Look in the new thread here: AmdMsrTweaker - New Versions

[Punisher!]

Look in the new thread here: AmdMsrTweaker - New Versions

Thanks.

Inviato dal mio Nexus 4 con Tapatalk 2

[johannes]

I ported the tool to Linux. It works with a E-350 and an A10-5700 and should work with all processors supported by AmdMsrTweaker. (/proc/cpuinfo does not reflect the changed frequency)

How to get it:
Clone the repo https://github.com/johkra/amdmsrtweaker-lnx , execute "make" in the source directory and use the resulting "amdmsrt" executable.

How to use it:
Make sure you have the msr and cpuid modules loaded ("modprobe msr"/"modprobe cpuid" as root). The use it like AmdMsrTweaker.exe. The Linux "amdmsrt" executable has to be run as root.

I would like to hear from others if they had any problems with the port and hope I could help someone. :-)

[johannes]

I added precompiled binaries for those who don't want to compile the code.

Please see the readme for 32bit and 64bit download links.