Is It Worthwhile Running Intel Alder Lake With mitigations=off?

[bug77]

Is it worth running the iGPU with DDR4 or DDR5 memory, please tell us Mike.

The IGP is fine for desktop tasks and inadequate for gaming with either RAM type. You don't need benchmarks to tell you that.

[darkcoder]

With due respect to Michael, imo is more important to know if the mitigations are actually still needed, considering is a new architecture and very likely mitigations are already in place on the design.

[Teggs]

Looks like Intel has done a spectacular job of addressing performance regressions related to the use of mitigations. Kudos!

What evidence do you have for this? In this case, Alder Lake has a host of mitigations baked in, and we have no theoretical 'clean' silicon to test against to see how efficient the mitigations are.

[perpetually high]

December 2020 is far from recent. That’s exactly one year ago. Lots has changed. We’ll have to get a refresh of these benchmarks. Regardless, thanks for following up avem

[avem]

Source? From my limited pts/osbench benchmarks, practically zero effect disabling mitigations on Zen 3 (5800X). Might have been true before, but no longer true with latest microcodes/patches.

Phoronix post

Openbenchmarking link

Your limited right.

Here's Michael's own most recent data.

Almost 7% for 5600X which is not something to be trifled with.

[mr_marmalade]

nevermind

[F.Ultra]

I am hallucinating or Phoronix has been changing a default ? Imagine that, CHANGING A DEFAULT ! Who ever do that in the real world ? /s

I know that you are joking, but this is far from the first time Michael did benches with mitigations=off

[perpetually high]

I agree with you that "quite significant" is hyperbole on avem's part. But still, 2% could be considered significant, depending on each one's standards. I just did the quick math and Michael's benchmarks of the Core i9 12900K only exhibit 0.4% average performance improvement by going "mitigations=off", while your linked test of the Ryzen 5800X shows 2%.

Thanks for working out that math on that, I was curious myself lol. And yeah I didn't mean to say "zero effect" on Zen 3 since I did see *a* difference but not as much as Alder Lake, which is really impressive by Intel.

[Slartifartblast]

Is it worth running the iGPU with DDR4 or DDR5 memory, please tell us Mike.

[jntesteves]

Source? From my limited pts/osbench benchmarks, practically zero effect disabling mitigations on Zen 3 (5800X). Might have been true before, but no longer true with latest microcodes/patches.

Phoronix post

Openbenchmarking link

I agree with you that "quite significant" is hyperbole on avem's part. But still, 2% could be considered significant, depending on each one's standards. I just did the quick math and Michael's benchmarks of the Core i9 12900K only exhibit 0.4% average performance improvement by going "mitigations=off", while your linked test of the Ryzen 5800X shows 2%.