Mailinglist Archive: opensuse-factory (443 mails)

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[opensuse-factory] Re: Bad Windows 10 performance on Qemu 4.0
On Wed 10 Jul 2019 09:35:48 PM CDT, Bjoern Voigt wrote:

Since several months I have performance problems with my Windows 10
virtual machine.

The host system (Intel Core i5 750, 2.8 GHz; 16 GB RAM; 3 TB WD Red
harddisk for the VMs) with openSUSE TW (Qemu 4.0) should be strong
enough to run a single Windows 10 desktop in a virtual machine. Other
VMs (Linux, FreeBSD) are running without performance problems.

But if I start Windows 10 as a single Qemu KVM guest system, the
desktop of the host system sometimes becomes unresponsive during
Windows boot. The performance of the Windows 10 desktop is bad,
approximately 10-20x slower than native and the host system
performance also becomes worse.

I had the performance problems with Windows 10 1809. Now I installed a
fresh Windows 10 1903 machine. The performance is better compared to
the old VM, but also bad.

I implemented the common performance hints:
- enough hard disk (55 GB) and RAM (2-5 GB) and CPU cores (2) for the
guest system
- all available Virtio drivers (disk, network, balloon, spice, tablet)
- disabled disk cache (currently cache='unsafe', but also tried
- HyperV options enabled (see

Here is my Windows 10 1903 quest setup:

Does anyone has a working configuration on TW or configuration hints
for me?

I also wonder about the following "CLOSE WONTFIX" comment on
"For me this is fixed in the EV variant of the software."

Qemu-ev is Redhat's own version of Qemu?

I'm using UEFI, pc-q35-4.0, RH virtio for the disk and gpu passthrough.

Two cores (i5-3470S) and 4G RAM allocated. I'm using this setup for
openSUSE/SLE and Windows guests.

The only thing I did on the WinX (1903v1) guest was remove unused apps
(xbox, game bar, onedrive etc), however also killed of SearchUI.exe (aka
Cortana) as that was a hog, now I have a reasonable WinX desktop for

I don't see any lagging on the host (Tumbleweed) or guests...

The next thing I see is TiWorker.exe busy... updates....

Cheers Malcolm °¿° SUSE Knowledge Partner (Linux Counter #276890)
Tumbleweed 20190708 | GNOME Shell 3.32.2 | 5.1.16-1-default
Intel DQ77MK MB | i5-3470S X4 @ 3.60 GHz | Intel Ivybridge HD 2500
up 3:25, 2 users, load average: 7.98, 3.07, 1.37

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