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[Qemu-devel] [Bug 1811533] [NEW] Unstable Win10 guest with qemu 3.1 + hu
From: |
Žilvinas Žaltiena |
Subject: |
[Qemu-devel] [Bug 1811533] [NEW] Unstable Win10 guest with qemu 3.1 + huge pages + hv_stimer |
Date: |
Sat, 12 Jan 2019 18:43:14 -0000 |
Public bug reported:
Host:
Gentoo linux x86_64, kernel 4.20.1
Qemu 3.1.0
CPU: Intel i7 6850K
Chipset: X99
Guest:
Windows 10 Pro 64bit (1809)
Machine type: pc-q35_3.1
Hyper-V enlightenments:
hv_stimer,hv_reenlightenment,hv_frequencies,hv_vapic,hv_reset,hv_synic,hv_runtime,hv_vpindex,hv_time,hv_relaxed,hv_spinlocks=0x1fff
Memory: 16GB backed by 2MB huge pages
Issue:
Once guest is started, log gets flooded with:
qemu-system-x86_64: vhost_region_add_section: Overlapping but not
coherent sections at 103000
or
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.
Observations:
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
** Affects: qemu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1811533
Title:
Unstable Win10 guest with qemu 3.1 + huge pages + hv_stimer
Status in QEMU:
New
Bug description:
Host:
Gentoo linux x86_64, kernel 4.20.1
Qemu 3.1.0
CPU: Intel i7 6850K
Chipset: X99
Guest:
Windows 10 Pro 64bit (1809)
Machine type: pc-q35_3.1
Hyper-V enlightenments:
hv_stimer,hv_reenlightenment,hv_frequencies,hv_vapic,hv_reset,hv_synic,hv_runtime,hv_vpindex,hv_time,hv_relaxed,hv_spinlocks=0x1fff
Memory: 16GB backed by 2MB huge pages
Issue:
Once guest is started, log gets flooded with:
qemu-system-x86_64: vhost_region_add_section: Overlapping but not
coherent sections at 103000
or
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.
Observations:
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:
https://bugs.launchpad.net/qemu/+bug/1811533/+subscriptions
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Žilvinas Žaltiena <=