On Fri, 2011-07-01 at 17:05 +0200, Alon Levy wrote: > On Fri, Jul 01, 2011 at 03:00:32PM +0200, Gianluca Cecchi wrote: > > On Fri, Jul 1, 2011 at 1:04 PM, John A. Sullivan III wrote: > > > Interesting observation. That is true; we did not create separate VM > > > definitions for SPICE and TSPlus thus the TSPlus environment is using > > > the QXL driver. Would we expect that to have any "supercharging" effect > > > on RDP? > > > > > > > > > > Probably not, because afaik (that is not so much ;-) Remote Desktop > > (and probably tsplus too) works at the GDI call level, so it should > > not depend so much on video adapter/video driver... > > It was simply a question that arose analysing how to correctly > > replicate comparisons... > > Coming back to the test case and these operations: > > > > rdp > > 17: display desktop, i.e., minimize all open applications > > 42: Paint existing LibreOffice document, i.e., restore from > > minimize > > > > spice > > 61: display desktop, i.e., minimize all open applications > > 92: Paint existing LibreOffice document, i.e., restore from > > minimize > > > > I think they are GDI ones, so that naturally when using rdp they are > > executed locally on client desktop (only the gdi directives are sent), > > while in spice (raster?) they will be network intensive (from a slow > spice implements a driver, which implements a large part of the gdi api. So > any > operation that it doesn't implement is done via the windows gdi software > rendering > and the result given to the driver (which is spice) as an image. > > So in cases where the specific operations are all implemented by the driver > the > performance should be identical. In other cases spice will be suboptimal, > since > it will send the image and not the operation. In both cases the rendering > should > be correct. > > > link point of view). > > So probably an optimized rdp could never be beaten on too slow links? > > > ><snip> Hmm . . . I remember you saying that the Windows product was actually more developed than the Linux product. Could it be that you have implemented more of the GDI API than the X API (or whatever one uses for Linux) and thus my Linux client is more regularly falling back to sending images rather than directives?
Unfortunately, I don't have any Windows systems here in the lab to compare with Linux. We are rousting up some Windows testers but they are all in the UK and not here where I can observe them side by side it the lab. I'll have to see what I can do about that. Just a thought - John _______________________________________________ Spice-devel mailing list Spice-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/spice-devel
