[Spice-devel] Dreadful performance under Windows 10 Enterprise 2016 LTSB

[George Diamantopoulos]

Hello all,

I'm trying out qxl-dod in a new installation, and performance is so low
that the guest is practically unusable. Redrawing takes about 4-5 seconds.
I have used qxl-dod in the past on the same hardware with much better
results, although the software stack is different this time. I tried
disabling all visual effects, but apart from the expected gains (fewer
frames to redraw after each action due to the animations' being disabled)
it didn't improve usability much.

As I have no idea how to provide useful debugging information on this, I'll
try to outline my configuration here for now. Please let me know if there's
anything I can do to provide more meaningful information:

Host: Gentoo linux, kernel 4.9.1
Hypervizor: Xen 4.8.0
QEMU: 2.8.0 (I'm not using xen's spin of qemu)
libvirt: 2.5.0
virt-manager: 1.4.0
spice: 0.13.3
seabios: 1.10.1

Windows Guest VM is started with the following options:
/usr/libexec/xen/bin/qemu-system-i386 -xen-domid 2 -chardev
socket,id=libxl-cmd,path=/run/xen/qmp-libxl-2,server,nowait -no-shutdown
-mon chardev=libxl-cmd,mode=control -chardev
socket,id=libxenstat-cmd,path=/run/xen/qmp-libxenstat-2,server,nowait -mon
chardev=libxenstat-cmd,mode=control -nodefaults -no-user-config -name
Windows -vnc none -display none -k en-us -serial pty -spice
port=5901,tls-port=0,disable-ticketing,agent-mouse=on,disable-copy-paste
-device qxl-vga,vram_size_mb=64,ram_size_mb=64 -boot order=cd -smp
2,maxcpus=2 -device rtl8139,id=nic0,netdev=net0,mac=00:16:3e:25:27:01
-netdev type=tap,id=net0,ifname=vif2.0-emu,script=no,downscript=no -machine
xenfv -m 1920 -drive
file=/dev/zvol/tank/windows,if=ide,index=0,media=disk,format=raw,cache=writeback
-drive
if=ide,index=1,readonly=on,media=cdrom,id=ide-832,file=/home/gd/Downloads/ISOs/SW_DVD5_WIN_ENT_N_LTSB_2016_64BIT_Eng_Intl_MLF_X21-07527.ISO,format=raw

I have used both vrozenfe binaries and flexvdi binaries: it made no
difference at all...

Also note that the mouse cursor is generally responsive. It will only lag
for a bit when hovering over items that need some refreshing (e.g.
highlighting).

BR,

George
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/spice-devel/attachments/20170110/c97cd474/attachment-0001.html>