Re: problems with refresh rate of Xwin at win2000prof

[Harold L Hunt II <huntharo at msu dot edu>]

The repainting might be slow for the two following reasons:

1) You have a video card that has a problem with its DirectDraw driver 
(e.g. ATI All-In-Wonder 8500 DV).  Try using "-engine 1" to use the GDI 
driver and see if it is much faster.  If it is, then you will have all 
sorts of fun testing the various drivers for your video card to see 
which one fixes the DirectDraw bug.  Note that "-engine 4" is not 
required because the DirectDraw engine is the default engine if 
DirectDraw is supported by your system.  You will only need "-engine 1" 
to force XWin.exe to use the GDI engine instead of the DirectDraw engine.

2) You have network latency issues.  Sure, 100BaseT, yada yada yada, but 
if you have not tried another X Server on Windows then you have nothing 
to compare the performance of XWin.exe to and we cannot tell if your 
network is part of the problem or not.

Hope that helps,

Harold

Khamenia, Valery wrote:

> > How do you measure your refresh rate? 
>
>
> 1Hz refresh rate one could measure by eye :)
>
>
> > I never seen a monitor that worked with vertical refresh rate of 1Hz.
>
>
> I do not speak about vertical refresh rate of monitor.
> I mean refresh rate of Xwin itself
>
>
>
> > According to man XWin, the correct option is -refresh. 
>
>
> you are right. It was just a typo in my email.
> I've used "-refresh" of course.
>
>
> > Which is valid when you run in fullscreen mode with DirectDraw engine. 
>
>
> I have used fullscreen mode.
>
> is DirectDraw specified by -engine 4?
>
>
> > You should try to run XWin -refresh xx -engine 4 -fullscreen.
>
>
> the same. Exited :(
>
>
> > Also, I don't think 25Hz is a valid refresh rate for any monitor.
>
>
> well I see, probably "-refresh" *does* have something to do with vertical
> refresh rate.
>
> Indeed, i've tried 75Hz and it doesn't exit!
>
> Then my questions are:
>
>   1. why repainting rate is so low?
>
>   e.g., 
>
>   2. how could I get quicker redraw of the window while dragging it?
>   (I do not immediatelly believe that it is a Ethernet card latency problem)
>
> kind regards,
> Valery A.Khamenya
> ---------------------------------------------------------------------------
> Bioinformatics Department
> BioVisioN AG, Hannover