[Bug 13801] Very slow text rendering in AutoCAD

wine-bugs at winehq.org wine-bugs at winehq.org
Sat Sep 20 13:19:39 CDT 2008


--- Comment #31 from max at veneto.com  2008-09-20 13:19:39 ---
(In reply to comment #30)

> I have to retract that. Further experiments reveal that the locking mechanism
> per se does not cause trouble. The bad performance can be instead attributed to
> the call to XShmGetImage in X11DRV_DIB_GetImageBits (which is invoked a lot
> from X11DRV_DIB_Coerce when text rendering operations are performed).
> Commenting out just that call makes, like the previously described actions, all
> text disappear and restores good performance.
> Elsewhere I read that XShmGetImage may be slow because of pixel data being
> stored directly in the video memory and having to be transferred to the main
> memory. Inspired by this explanation, I switched from the proprietary nvidia
> driver 96.43.07 (my video card is a GeForce4 MX 440 AGP) to the framebuffer
> device driver. Lo and behold, it also restored good performance! This
> workaround is easy and good enough for playing the TSE2 game, but probably too
> drastic in general. However, it could also be that the particular versions of
> the nvidia driver and video hardware are to blame, so it is recommended that
> other people try to reproduce this bug to help estimate its significance.
I tried to remove the XShmGetImage() call from inside dlls/winex11.drv/dib.c
but it did nothing to AutoCAD.... uhmm... need some more testing.


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