AMD Ryzen 9 7950X3D Linux Performance

[nerdopolis]

One series of tests that might be interesting, what if you take the 7950x and use /sys/devices/system/cpu/cpu(x)/online to disable half the cores,
then on the 7950x3d, use it to disable the cores on the CCD with the smaller cache, that should in theory see see how much performance the cache offers for things, without the scheduler getting in the way

For even more science, it would be cool to see the 7950x3d with the cores on the CCD with the larger cache disabled

Although I don't know if it's possible both ways, as I know I can't turn off CPU0


But the few seconds off of code compiliation but using a lot less power already looks promising

[unwind-protect]

One series of tests that might be interesting, what if you take the 7950x and use /sys/devices/system/cpu/cpu(x)/online to disable half the cores,
then on the 7950x3d, use it to disable the cores on the CCD with the smaller cache, that should in theory see see how much performance the cache offers for things, without the scheduler getting in the way

For even more science, it would be cool to see the 7950x3d with the cores on the CCD with the larger cache disabled

Although I don't know if it's possible both ways, as I know I can't turn off CPU0


But the few seconds off of code compiliation but using a lot less power already looks promising

You could stuff the benchmark into a container with only the desired cores being available in that container.

ETA: This benchmark run is using Windows and tests both the BIOS priorities for cache or frequency. Quite interesting. For my uses frequency is generally better:

https://www.techpowerup.com/review/amd-ryzen-9-7950x3d/9.html

[cjcox]

Awesome Ryzen performance. Not even a single reason to consider Intel as an alternative.

Uh, there's plenty of reasons. There's more to a platform overall. I'm not dissing the Ryzen, just pointing out the errors in the statement.

[bosjc]

No Total War test results anymore ? Warhammer 3 is at least still pretty relevant/modern

[shmerl]

I only care about code compiling etc, and workstation use, gaming is ¯\_(ツ)_/¯ for me .

Slightly slower in some benchmarks but MUCH lower thermals... interesting. Probably some half-decent overclocking to come for even better performance?

I assume it's because 7950X wasn't used in 105W eco mode. That would have been an interesting comparison with 7950X3D.

Many pointed out, that gains in performance in 170W mode for 7950X vs 105W mode are pretty small, while power usage and thermals cost is disproportionately higher.

I doubt 7950X3D has overclocking room.

[Thunderbird]

Solid CPU, good power consumption. Of course like others mentioned the challenges are around application scheduling. This is super hard any workload is different. Since this CPU is so specific, this is actually an argument for that eBPF based scheduler, which was recently proposed. The heuristics are so custom and maybe even user specific, this would be a perfect use case. In a way that's comparable go what AMD is doing on Windows by having external software do some monitoring and guiding the kernel.

[WonkoTheSaneUK]

According to Techpowerup, to properly enable the new functions on Windows requires installing 8 special AMD drivers from Xbox Game Bar.

One series of tests that might be interesting, what if you take the 7950x and use /sys/devices/system/cpu/cpu(x)/online to disable half the cores,
then on the 7950x3d, use it to disable the cores on the CCD with the smaller cache, that should in theory see see how much performance the cache offers for things, without the scheduler getting in the way

For even more science, it would be cool to see the 7950x3d with the cores on the CCD with the larger cache disabled

Although I don't know if it's possible both ways, as I know I can't turn off CPU0


But the few seconds off of code compiliation but using a lot less power already looks promising

Techpowerup tried this too, and published their findings here

[Lycanthropist]

This is more cache than my first computer had disk space! XD

[Mark Rose]

This image is broken for me: https://www.phoronix.net/image.php?i...en7950x3d7_med

Interesting to see it did well with gaming performance. I was worried about how the scheduler would interact.

[schmidtbag]

Uh, there's plenty of reasons. There's more to a platform overall. I'm not dissing the Ryzen, just pointing out the errors in the statement.

Such as?