How can I check particular cpu core belongs to P-core or E-core group? Is there any way to list information about Performance/Energy cores in a running Linux x86_64 alder lake system? Like, Printing any of the sysfs parameters?
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We can identify which core has SMT (hyper-threading) enabled. Run:
lscpu --all --extended
This is the result for 12900K:
➜ lscpu --all --extended
CPU NODE SOCKET CORE L1d:L1i:L2:L3 ONLINE MAXMHZ MINMHZ
0 0 0 0 0:0:0:0 yes 6700.0000 800.0000
1 0 0 0 0:0:0:0 yes 6700.0000 800.0000
2 0 0 1 1:1:1:0 yes 6700.0000 800.0000
3 0 0 1 1:1:1:0 yes 6700.0000 800.0000
4 0 0 2 2:2:2:0 yes 6500.0000 800.0000
5 0 0 2 2:2:2:0 yes 6500.0000 800.0000
6 0 0 3 3:3:3:0 yes 6500.0000 800.0000
7 0 0 3 3:3:3:0 yes 6500.0000 800.0000
8 0 0 4 4:4:4:0 yes 6500.0000 800.0000
9 0 0 4 4:4:4:0 yes 6500.0000 800.0000
10 0 0 5 5:5:5:0 yes 6500.0000 800.0000
11 0 0 5 5:5:5:0 yes 6500.0000 800.0000
12 0 0 6 6:6:6:0 yes 6500.0000 800.0000
13 0 0 6 6:6:6:0 yes 6500.0000 800.0000
14 0 0 7 7:7:7:0 yes 6500.0000 800.0000
15 0 0 7 7:7:7:0 yes 6500.0000 800.0000
16 0 0 8 8:8:8:0 yes 3900.0000 800.0000
17 0 0 9 9:9:8:0 yes 3900.0000 800.0000
18 0 0 10 10:10:8:0 yes 3900.0000 800.0000
19 0 0 11 11:11:8:0 yes 3900.0000 800.0000
20 0 0 12 12:12:9:0 yes 3900.0000 800.0000
21 0 0 13 13:13:9:0 yes 3900.0000 800.0000
22 0 0 14 14:14:9:0 yes 3900.0000 800.0000
23 0 0 15 15:15:9:0 yes 3900.0000 800.0000
Now, look at the CPU column and CORE column. For example:
- CPU 0 and CPU 1 belong to CORE 0. Therefore, CORE 0 is a P-core with SMT.
- CPU 16 belongs to CORE 8. Therefore, CORE 8 is an E-core.
Note that this method will only work if you haven’t explicitly disabled P-core’s SMT in BIOS. If you disabled SMT in BIOS, you may look at the MAXMHZ column as suggested in Peter’s comment.
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