[Spice-devel] "qxl: add optinal 64bit vram bar" patch significantly slows down Spice

Hans de Goede hdegoede at redhat.com
Fri Apr 6 06:54:57 PDT 2012

Hi Gerd,

While cherry picking some spice patches into my own qemu-kvm-1.0 branch,
so that we can add them to Fedora-17 I noticed a significant slowdown
after I was done cherry picking. Investigation has shown your
"qxl: add optinal 64bit vram bar" patch to be the culprit.

I noticed this using an old Fedora-14 32 bits vm with an xorg-x11-drv-qxl
patched to use the async methods.

If I scroll through the gnome applications menu with the mouse with
plain qemu-kvm-1.0 all is fine, but once I add your:
"qxl: add optinal 64bit vram bar" the updating of the display
becomes noticably slower, the blue bar highlighting the selected
menu entry becomes lagged compared to the mouse cursor.



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