Performing verification for Noble I deployed a bare metal host, and installed a KVM stack just like the testcase section.
Sapphire Rapids Intel(R) Xeon(R) Platinum 8468 24.04 LTS Noble 6.8.0-51-generic Outside VM cpuid 3528 cpuid 3526 cpuid 3444 cpuid 3360 cpuid 3268 Inside VM cpuid 66278 cpuid 70955 cpuid 67065 cpuid 69456 cpuid 68781 I then enabled -proposed on both the bare metal system and the VM, and installed 6.8.0-53-generic. $ uname -rv 6.8.0-53-generic #55-Ubuntu SMP PREEMPT_DYNAMIC Fri Jan 17 15:37:52 UTC 2025 I then re-ran the tests: 6.8.0-53-generic Outside VM cpuid 3353 cpuid 3367 cpuid 3270 cpuid 3304 cpuid 3245 Inside VM cpuid 23412 cpuid 24049 cpuid 23952 cpuid 23439 cpuid 23995 As we can see, Outside VM testcases are stable, while Inside VM performance has improved by what we expected, going from around 69,000 to 23,000. The kernel in -proposed solves the problem, happy to mark verified for Noble. ** Tags removed: verification-needed-noble-linux ** Tags added: verification-done-noble-linux -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093146 Title: KVM: Cache CPUID at KVM.ko module init to reduce latency of VM-Enter and VM-Exit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2093146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs