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From: Launchpad Bug Tracker <1703506@bugs.launchpad.net>
To: qemu-devel@nongnu.org
Subject: [Bug 1703506] Re: SMT not supported by QEMU on AMD Ryzen CPU
Date: Tue, 22 Jun 2021 04:18:57 -0000	[thread overview]
Message-ID: <162433553753.20423.306308208254101838.malone@loganberry.canonical.com> (raw)
In-Reply-To: 149974876377.6612.10329067332937096720.malonedeb@gac.canonical.com

[Expired for QEMU because there has been no activity for 60 days.]

** Changed in: qemu
       Status: Incomplete => Expired

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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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  parent reply	other threads:[~2021-06-22  5:05 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-07-11  4:52 [Qemu-devel] [Bug 1703506] [NEW] SMT not supported by QEMU on AMD Ryzen CPU A S
2017-07-18 13:43 ` [Qemu-devel] [Bug 1703506] " Databay
2017-07-18 18:52 ` Eduardo Habkost
2017-07-18 21:57 ` Eduardo Habkost
2017-07-19  1:20 ` A S
2017-07-19 10:32 ` Imatimba
2017-07-19 12:18 ` Eduardo Habkost
2017-07-20  2:48 ` Imatimba
2017-07-22  4:02 ` Imatimba
2017-07-25 18:09 ` Eduardo Habkost
2017-07-25 18:38 ` Eduardo Habkost
2018-01-30 16:00 ` Babu Moger
2018-01-30 16:19 ` Babu Moger
2018-03-12  3:05 ` pseudoterminal X0
2018-12-10 10:44 ` asd fghjkl
2018-12-10 16:48 ` Eduardo Habkost
2018-12-13 15:49 ` asd fghjkl
2018-12-13 16:08 ` Eduardo Habkost
2020-11-16 18:08 ` Thomas Huth
2021-04-22 17:26 ` Thomas Huth
2021-06-22  4:18 ` Launchpad Bug Tracker [this message]
2022-05-08 10:08 ` Andrii
2023-03-16  2:39 ` Anthony Kamau
2023-03-22 22:32 ` Nelo

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