[Slackbuilds-users] [Slackbulds-users] qemu-2.6.0 issue with Windows guests.

King Beowulf kingbeowulf at gmail.com
Wed Aug 3 06:43:16 UTC 2016

On 08/02/2016 12:24 PM, Gerardo Zamudio wrote:
> Hey Ed
> I have an issue with qemu-2.6 and Windows guests (2003, XP, 7, 2012) on
> physical Slackware64 14.2 and Slackware 14.2 servers. My problem is disk
> writes are *extremely slow*, to the point that I can't even start the
> installer because the "Starting Windows..." screen never goes away. I've
> tried it on different pieces of hardware but have not had any luck yet.
> In my case, qemu-2.4 works just fine on 14.1 and 14.2, so I've reverted
> to that. I'll do some testing over the weekend and see if I can track
> down what's causing this.

Are you host-mode or full emulation?  KVM modules loaded?   Note that
qemu upstream fiddles with the options quite a bit. For example, for 7
and 10, I use:

qemu-system-x86_64 -enable-kvm -machine accel=kvm -m 8G \
    -hda windows7.img -cdrom /dev/dvd -boot order=cd \
    -cpu host -smp 4 -name "Windows7pro64" -soundhw hda \
    -vga std -sdl -display gtk -usb \
    -netdev user,id=mynet1,hostname=win7vm,smb=/games/win32/ \
    -device virtio-net-pci,netdev=mynet1,mac=52:54:00:35:a6:50

(some redundancy but meh...)

also, what image file (qcow2 etc) set up is can impact performance as
well as your host hard drive configuration and format.

My hard drive speed with qemu-2.6 in XP, 7 and 10 is not stellar, but
plenty good enough.

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