On 5 May 2015 at 21:52, Gerd Hoffmann kraxel@redhat.com wrote:
Completely different approach: Instead of encoding each and every framebuffer update as spice operation simply update the shadow framebuffer and maintain a dirty rectangle. Also schedule a worker to push an update for the dirty rectangle as spice operation. Usually a bunch of dirty rectangle updates are collected before the worker actually runs.
What changes: Updates get batched now. Instead of sending tons of small updates a few large ones are sent. When the same region is updated multiple times within a short timeframe (scrolling multiple lines for example) we send a single update only. Spice server has an easier job now: The dependency tree for display operations which spice server maintains for lazy rendering is alot smaller now. Spice server's image compression probably works better too with the larger image blits.
Net effect: framebuffer console @ qxldrmfb is an order of magnitude faster now.
Signed-off-by: Gerd Hoffmann kraxel@redhat.com
Looks good, I often wondered if we should have done this, spice protocol overhead seemed quite high.
I'll merge this into drm-next.
Dave.