I've spent another week doing some analysis of XSpice performance. This is probably interesting mostly to me, but I thought I'd share the results for posterity. I was primarily concerned with performance connecting to a distant server and spent some energy optimizing for that case. I've used a methodology similar to that reported here: http://lists.freedesktop.org/archives/spice-devel/2012-August/010276.html In this case, I'm using a 1900x940 screen hosted on a server 80 ms away from the spice client. (Previous tests used a smaller screen, and were local). I'm running a LibreOffice test (draw a smile, insert the smile into a document, type). I've shifted to using a dfps setting of 30 fps; it's not significantly more expensive, and it improves the user experience somewhat. It's hard to try to create an objective analysis of the difference. Subjectively, they 'feel' similar. There are a few cases where the dfps mode clearly wins (opening a LibreOffice drawing takes at least twice as long in 'regular' mode as it does in dfps). Dragging a window has a slightly nicer feel in 'regular' mode. I did perform an objective analysis of bandwidth usage. Those results are: Application Packets Bytes Spice/Regular 16,437 11,457,644 Spice/DFPS 8,821 8,102,332 TigerVNC 29,304 36,476,788 So, again, the DFPS mode, even at 30 frames per second, seems like a good fit for my purposes. I did make an effort to use the DFPS mode with regular qemu, but that has broken. I haven't dug in to try to figure out what was wrong; I'm hoping to get to that at some point in the not too distant future. One odd anomaly jumped out at me: the CPU usage for the non DFPS case has jumped substantially. That is, I used to see about a 400% difference in CPU usage (e.g. the dfps case used about 1/4 the number of jiffies as the mainline case). I still see a jump of about 4x in the usermode jiffie count (field 14 in /proc/X/stat), but now I see an enormous spike in the kernelmode jiffie counts [11,000 vs 100] (field 15 in /proc/X/stat). That seems odd. It may well be testing error, but it may also point to an interesting bug. That, too, I hope to get time to track down. Cheers, Jeremy _______________________________________________ Spice-devel mailing list Spice-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/spice-devel