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[Bug 1703506] Re: SMT not supported by QEMU on AMD Ryzen CPU
From: |
Thomas Huth |
Subject: |
[Bug 1703506] Re: SMT not supported by QEMU on AMD Ryzen CPU |
Date: |
Thu, 22 Apr 2021 17:26:48 -0000 |
** Bug watch removed: Red Hat Bugzilla #1135772
https://bugzilla.redhat.com/show_bug.cgi?id=1135772
** Bug watch removed: Red Hat Bugzilla #1592276
https://bugzilla.redhat.com/show_bug.cgi?id=1592276
** Changed in: qemu
Assignee: Eduardo Habkost (ehabkost) => (unassigned)
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https://bugs.launchpad.net/bugs/1703506
Title:
SMT not supported by QEMU on AMD Ryzen CPU
Status in QEMU:
Incomplete
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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