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E cores? #3338
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Can you see if |
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Alright, seems to be working. We just need to hook up the core-specific perf-counter selection that we do on ARM then. Somewhat annoyingly, Intel microcode-updated all these chips to fake the CPUID to be the same on both cores, though there's a different CPUID leaf that can be used to detect that: https://www.intel.com/content/www/us/en/developer/articles/guide/12th-gen-intel-core-processor-gamedev-guide.html |
I have run into this same issue with an i7-1250U. At least I found this ticket before creating a duplicate. Pinning to core 0 seems a sufficient workaround. With intel-microcode 3.20230512.1 and Linux 6.1.0-10 (Debian) the cpuid utility (version 20230120) reports this as:
Note "Core" vs. "Atom". I have hyperthreading enabled, so the two P cores appear as 4. |
Same here for an
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At first glance, it looks like the E cores on newer Intel CPUs don't have perf counters. Can/should rr automatically pin itself to only run on cores that are going to work?
Fix for i9-12900K:
Picking the CPU to bind on seems to work too.
Disabling the cores works too, not sure if there's any performance benefit to doing so though.
Source: https://unix.stackexchange.com/questions/686459/disable-intel-alder-lake-efficiency-cores-on-linux
Related: #2997 #3032
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