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[Bug 1703506] Re: SMT not supported by QEMU on AMD Ryzen CPU
From: |
Nelo |
Subject: |
[Bug 1703506] Re: SMT not supported by QEMU on AMD Ryzen CPU |
Date: |
Wed, 22 Mar 2023 22:32:07 -0000 |
This affected me. Took me several days.
The solution posted by asd fghjkl (ryzen27) worked for me as well:
sudo nano /etc/modprobe.d/kvm.conf
options kvm ignore_msrs=1
and then rebooted
I'm very glad i found this thread. Don't know where to report this or if
it's even a bug, But hope it gets fixed!
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https://bugs.launchpad.net/bugs/1703506
Title:
SMT not supported by QEMU on AMD Ryzen CPU
Status in QEMU:
Expired
Bug description:
HyperThreading/SMT is supported by AMD Ryzen CPUs but results in this
message when setting the topology to threads=2:
qemu-system-x86_64: AMD CPU doesn't support hyperthreading. Please
configure -smp options properly.
Checking in a Windows 10 guest reveals that SMT is not enabled, and
from what I understand, QEMU converts the topology from threads to
cores internally on AMD CPUs. This appears to cause performance
problems in the guest perhaps because programs are assuming that these
threads are actual cores.
Software: Linux 4.12, qemu 2.9.0 host with KVM enabled, Windows 10 pro
guest
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