Re: Raptor Lake / Alder lake on RELENG_13 ?
- Reply: mike tancsa : "Re: Raptor Lake / Alder lake on RELENG_13 ?"
- In reply to: mike tancsa : "Raptor Lake / Alder lake on RELENG_13 ?"
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Date: Tue, 07 Feb 2023 13:29:15 UTC
On 6 Feb 2023, at 16:04, mike tancsa wrote: > Hi All, > > I have seen a couple of commits around these CPUs, but wondering if anyone is running 13 on these newer hybrid CPUs ? Do the slower cores just get disabled or are they made use of somehow ? > > ---Mike I have been testing the changes on -current, and they are working fine. I have not tested on 13, but I would expect the same result. The workaround is on 13-stable, but not yet a RELENG branch. Presumably it will be in 13.2 when it is branched. If no one else has reported, I will test the 13.2 branch. Also, I haven’t heard of tests on Raptor Lake, but I have heard that the behavior should be the same as Alder Lake. The E-cores are not disabled. They are forced to use a less efficient method of page invalidation. They are scheduled as if they were P-cores without threads, but they are less used because of the shared cache among 4 cores rather than 2. I have some preliminary scheduler changes that recognize the slower cores, but there are still issues to be dealt with. Mike