ryzen_smu VS linux

Actually that’s precisely how I made my linux monitor for Zen 2/3. Zen 4 wouldn’t be any different.

I still wondering how to control CPU, found many stuff such as amd_pstate, ryzen_smu, RyzenAdj, amdctl. Now I'm trying to figure something out but it has too many options ☺

P.S. Since you’re using a 3700X, you can check out my project that I wrote for my own 3700X here that allows you to monitor the processor in far more detail than Linux is capable of showing. You’ll see per-core temperatures, true effective frequency per core, true core voltages (per core) and tons of other info. May be interesting to you so that’s why I mentioned it.

The CPU calculates effective clocks itself. It does this by using the PLL frequency which it constantly keeps track of and is able to calculate exactly how many cycles the processor was not gated for (C1/C6). All of this is done in a coprocessor, the SMU, so there’s no variations due to polling inaccuracies, it’s not an average — it is the actual PLL frequency that excludes gated cycles. HWiNFO64 does not show this true value but rather attempts to calculate itself via polling which causes an ‘averaged’ value.

For Linux I made my own version that pulls effective frequencies directly from the SMU, so you don’t run into ‘averaging errors’ due to kernel timing weirdness as this is calculated off-chip on the cIOD of the processor independently of cores.

Source: I literally reverse engineered Ryzen Master to port it to Linux. You can see my project and it’s source code. That shows everything Ryzen Master does (look in userspace/monitor_cpu.c).

How can I state all this confidently? Because I've reverse-engineered Ryzen Master myself and even wrote a Linux driver to show you exactly what Ryzen Master shows. In fact there's a lot of information it leaves out as well. I haven't ported it to other processors aside from my own 3700X but this spinoff project does add support for the 5000 series and quite a few other 3000 series processors. If you're looking for a "Ryzen Master" like monitoring tool, that will almost certainly work.

As the person who ported SMU control based power metrics to Linux and indirectly Zen 3 power monitoring, I’ve received at least a dozen 5600X power metrics samples and all of them listed, at least as reported via the SMU, the same thing Ryzen Master pulls its info from, PPT as 76 W. AGESA versions ranged from 1.1.06 (iirc) all the way to the current 1.2.0.2. The actual fuses themselves report a baked in 76 W limit.

BTW, this is terrific!

Sleeping cores in Ryzen Master actually indicates whether a core was in a C0 state for less than 7% of the time, seen here from a basic reverse-engineering of Ryzen Master.

FFS predates FreeBSD and is in some capacity supported by all 3 major BSDs. I'm fairly confident that Linux actually supports it through the ufs driver ( https://github.com/torvalds/linux/tree/master/fs/ufs ); whether the use of different names in different places makes it better or worse is an exercise for the reader.

These are a bit easier to see what's going on:

https://github.com/torvalds/linux/commit/d5cf50dafc9dd5faa1e...

https://github.com/torvalds/linux/blob/d5cf50dafc9dd5faa1e61...

Unfortunately Github doesn't have a way to render symbols for whitespace, but you can tell by selecting the spaces that the previous version had leading tabs. Linus changed it so that the tokens `default` and the number e.g. `12` are also separated by a tab. This is tricky, because the token "default" is seven characters, it will always give this added tab a width of 1 char which makes it always layout the same as if it were a space no matter if you use tab widths of 1, 2, 4, or 8.

There was also a Gentoo effort to run atop FreeBSD[0]. The challenge of course is that afaik none of the BSD kernel ABIs are considered stable. The stable interface is the BSD libc. That said, with binfmt_misc, I don't see a reason you couldn't just run (at least some) FreeBSD binaries on Linux with a thin syscall translation layer (rather something like qemu-system) and then your layer hooked via binfmt_misc. I'm not aware of anyone who has done this for FreeBSD, but prior efforts existed as alternate binfmts for SysVr4/5 ELF binaries[2]. Either way would take some elbow grease, but you *might* even be able just reuse binfmt_elf and just have a new interpreter for FreeBSD elf.

[0] https://wiki.gentoo.org/wiki/Gentoo_FreeBSD

[1] https://docs.kernel.org/admin-guide/binfmt-misc.html

[2] https://github.com/torvalds/linux/blob/master/fs/binfmt_elf....

> The original less-than check was deemed incorrect

It was only deemed incorrect because of an information leak. Not because it's a valid use-case for user space to copy smaller portions of *hwrpb into user space. https://github.com/torvalds/linux/commit/21c5977a836e399fc71...

Correct. And the combined work needs to carry the MIT license text and copyright attributions for the MIT software authors. With binary distribution it must also be overt, not hidden in some source code drop, but directly accompanying the binary.

Many people who talk about relicensing never credit the MIT developers or distribute the MIT license text. "Because it's GPL now."

I don't think that you believe that, but many developers do.

Some don't see the need for source code scans for Open Source compliance, because the license.txt says GPL, so it's GPL. Prime example is the Linux kernel. There is code under different licenses in there, but people don't even read https://github.com/torvalds/linux/blob/master/COPYING till the end ("In addition, other licenses may also apply.") and conclude it's simply GPL 2 and nothing else.

Also be aware that sublicensing is not the same as relicensing.

> Does he have something against it?

He notoriously hates GNU Emacs, yes.

https://marc.info/?m=122955159617722

https://github.com/torvalds/linux/blob/master/Documentation/...

So If we would only count code and not comments, it is only 9489 LoC Rust. Which would be about 0.03% and if we take all lines and not only LoC it would be around 0.05%

[0] https://github.com/XAMPPRocky/tokei

[1] https://github.com/torvalds/linux/commit/b401b621758e46812da...