[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Bug 1811533] Re: Unstable Win10 guest with qemu 3.1 + huge pages + hv_s

From: Žilvinas Žaltiena
Subject: [Bug 1811533] Re: Unstable Win10 guest with qemu 3.1 + huge pages + hv_stimer
Date: Wed, 08 Jan 2020 17:28:00 -0000

I have applied these patches on qemu 4.2 and it seems they do fix the
problem: no more  vhost_region_add_section in the log, and I haven't
observed network or general performance loss in the span of one hour.

You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.

  Unstable Win10 guest with qemu 3.1 + huge pages + hv_stimer

Status in QEMU:

Bug description:
  Gentoo linux x86_64, kernel 4.20.1
  Qemu 3.1.0 
  CPU: Intel i7 6850K
  Chipset: X99

  Windows 10 Pro 64bit (1809)
  Machine type: pc-q35_3.1
  Hyper-V enlightenments: 
  Memory: 16GB backed by 2MB huge pages

  Once guest is started, log gets flooded with:

  qemu-system-x86_64: vhost_region_add_section: Overlapping but not
  coherent sections at 103000


  qemu-system-x86_64: vhost_region_add_section:Section rounded to 0
  prior to previous 1f000

  (line endings change)

  and as time goes guest loses network access (virtio-net-pci) and
  general performance diminishes to extent of freezing applications.

  1) problem disappears when hv_stimer is removed
  2) problem disappears when memory backing with huge pages is disabled
  3) problem disappears when machine type is downgraded to pc-q35_3.0

To manage notifications about this bug go to:

reply via email to

[Prev in Thread] Current Thread [Next in Thread]