[K12OSN] VNCViewer and speed of refresh

Doug Simpson simpsond at leopards.k12.ar.us
Wed Jul 14 18:39:50 UTC 2004


I read most of a post given and it is all greek to me. . 

It was about using X instead of vnc.

Given that there is an X server running at both places, what would be an 
example commandline for this scenario?

Computer at home, where the program is to *run*.

computer at work where the program running on the home computer would be 
displayed.

Thanks. . .

Doug


On Wed, 14 Jul 2004, Jeff Kinz wrote:

> On Wed, Jul 14, 2004 at 10:29:07AM -0500, Les Mikesell wrote:
> > Errr..., no.  The complaint was about VNC speed over a low bandwidth
> > link.  Running straight X is going to be much worse. VNC can skip
> 
> Errr..., no.
> 
> I have used X and TightVNC over the same link, and where VNC was doing
> the typical "4-10 seconds" per screen redraw, X was mostly keeping up
> with real time.
> 
> X-windows works much better over low bandwidth links than VNC.
> 
> Why?   Raw Data vs. Abstraction
> 
> Remote X-windows doesn't send any graphical information over the link.
> It sends only events like "Close Window 27" to the X-server at your
> display.
> 
> VNC, on the other hand, has to send an entire frame buffer of raster    
> data (hopefully optimized), resulting in transfers of thousands
> or tens of thousands of bytes where X sends only twenty or thirty bytes.
> Even with intelligently optimized 'skipping" of redraw data remote frame
> buffer systems like VNC have to send much more information over the
> network.
> 
> If VNC is more efficient, then we should use it instead of an X server
> for the thin clients right ?  Its certainly smaller than an X-Server.
> 
> (( Historical Note - VNC was invented by some folks at Olivetti in
> the UK (Later became part of AT&T). Its designed and intended use was
> to permit people using very small systems, incapable of running an
> "X-server", to access a machine running X-Windows.
> 
> See top right corner of page 3 of:
> http://www-lce.eng.cam.ac.uk/publications/files/tr.98.1.pdf  ))
> 
> 

-- 
Doug Simpson
Technology Specialist
DeQueen Public Schools
DeQueen, AR 71832
simpsond at leopards.k12.ar.us
XP is the biggest thorn in my side since Saddam Hussein!
Tux for President!





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