[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [Bug 1703506] [NEW] SMT not supported by QEMU on AMD Ryzen
From: |
A S |
Subject: |
[Qemu-devel] [Bug 1703506] [NEW] SMT not supported by QEMU on AMD Ryzen CPU |
Date: |
Tue, 11 Jul 2017 04:52:43 -0000 |
Public bug reported:
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
** Affects: qemu
Importance: Undecided
Status: New
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1703506
Title:
SMT not supported by QEMU on AMD Ryzen CPU
Status in QEMU:
New
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
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1703506/+subscriptions
- [Qemu-devel] [Bug 1703506] [NEW] SMT not supported by QEMU on AMD Ryzen CPU,
A S <=
- [Qemu-devel] [Bug 1703506] Re: SMT not supported by QEMU on AMD Ryzen CPU, Databay, 2017/07/18
- [Qemu-devel] [Bug 1703506] Re: SMT not supported by QEMU on AMD Ryzen CPU, Eduardo Habkost, 2017/07/18
- [Qemu-devel] [Bug 1703506] Re: SMT not supported by QEMU on AMD Ryzen CPU, Eduardo Habkost, 2017/07/18
- [Qemu-devel] [Bug 1703506] Re: SMT not supported by QEMU on AMD Ryzen CPU, A S, 2017/07/18
- [Qemu-devel] [Bug 1703506] Re: SMT not supported by QEMU on AMD Ryzen CPU, Imatimba, 2017/07/19
- [Qemu-devel] [Bug 1703506] Re: SMT not supported by QEMU on AMD Ryzen CPU, Eduardo Habkost, 2017/07/19
- [Qemu-devel] [Bug 1703506] Re: SMT not supported by QEMU on AMD Ryzen CPU, Imatimba, 2017/07/19
- [Qemu-devel] [Bug 1703506] Re: SMT not supported by QEMU on AMD Ryzen CPU, Imatimba, 2017/07/22
- [Qemu-devel] [Bug 1703506] Re: SMT not supported by QEMU on AMD Ryzen CPU, Eduardo Habkost, 2017/07/25
- [Qemu-devel] [Bug 1703506] Re: SMT not supported by QEMU on AMD Ryzen CPU, Eduardo Habkost, 2017/07/25