AMD Ryzen "Renoir" CPU Frequency Scaling Governor Performance

[phoronix]

Phoronix: AMD Ryzen "Renoir" CPU Frequency Scaling Governor Performance

With 129 tests carried out while also looking at the CPU power consumption and temperatures during benchmarking, here is a look at how the CPU frequency scaling governor plays a role in the performance of the latest-generation AMD Ryzen 4000 "Renoir" laptops for Linux.

http://www.phoronix.com/vr.php?view=29408

[edwaleni]

Interesting results.

Seems there are really only 2 modes. Powersave and "the rest".

The differences between all of the non-powersave modes were pretty small and probably fall in the range of error for the tests.

[sykobee]

Wonder if there's a way to get the battery life under each policy.

Can you switch policy on demand, e.g., if you start a game, you could set the policy to what that game performs best in?

Is there a Linux equivalent to Radeon Chill - sometimes you don't need the game to hit 100FPS, 60 is fine, and save power for the rest.

[skeevy420]

Wonder if there's a way to get the battery life under each policy.

Can you switch policy on demand, e.g., if you start a game, you could set the policy to what that game performs best in?

Is there a Linux equivalent to Radeon Chill - sometimes you don't need the game to hit 100FPS, 60 is fine, and save power for the rest.

Yes. Look into Feral's GameMode.

The closest thing I can think of to your second question would be libstrangle.

[LoveRPi]

Wait performance governor used less power than both on-demand and schedutil???

[tildearrow]

Typo?

While the "performance" governor is generally recommended for Linux gamers in leading to the best performance, that is the case specifically when using a discrete graphics card.

Did you mean "that isn't the case"?

[Snaipersky]

Typo?



Did you mean "that isn't the case"?

No, powersave for iGPUs (frees power budget for gpu), performance for dGPUs.

[s_j_newbury]

Wait performance governor used less power than both on-demand and schedutil???

As you would expect since this is measuring under full load and frequency changes cost cycles (transition latency). The performance and powersave governors always run a the highest and lowest available frequencies respectively.

[leipero]

isn't the default governor since 5.7 "schedutil" not "ondemand"?

[Michael]

isn't the default governor since 5.7 "schedutil" not "ondemand"?

No that's only for Intel P-State in HWP mode.