[Bug 2655] New: glxgears should call glFinish before glXSwapBuffers

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https://bugs.freedesktop.org/show_bug.cgi?id=2655          
     
           Summary: glxgears should call glFinish before glXSwapBuffers
           Product: xorg
           Version: CVS_head
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: App/glxgears
        AssignedTo: xorg-bugzilla-noise at freedesktop.org
        ReportedBy: fxkuehl at gmx.de


When I changed the Savage driver to flush primitives less frequently to the
hardware glxgears performance decreased, which is counter intuitive. The reason
is that glFinish currently waits for the blit from back to front buffer and
after that the hardware waits for glxgears and the driver to prepare the next frame.

Moving the call to glFinish before glXSwapBuffers fixes this and improves
performance a lot on this hardware (330fps -> 355fps). Now glxgears and the
driver can prepare the next frame while the hardware is busy with the blit (the
driver is smart enough to flush after expensive primitives like swap and clear).

I'll attach a patch for consideration.          
     
     
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