VNC Speed
 

I am now using VNC to work on my dream-computer (windows) from an older laptop (red hat), remotely. I do 3D Movies and graphics production, so I need a reasonably high refresh rate. I was originally connecting with a 10 mbps ethernet connection. At 10mbps, the screen was just a little bit too jerky for what I needed to do, so I went out and upgraded to 100mbps. Now that I have upgraded, the refresh rate seems to be the same as it was before. Why is that? I would think that I would have a much faster refresh rate. :confused:

Thank you,
LBB

What type of VNC are you using. I use tightVNC and that has a much faster refresh rate than realVNC. Also you might try using a GUI that has a low overhead. I've heard good things about BlackBox. Kde can just be slow. In the VNC server config pannel try changing the polling options. that can speed it up.

I had downloaded tightVNC and just never installed it. I found real VNC shortly after and since it had the java enabled acess I figured it was the better program. I'll try tVNC now.

-LBB

Ahhhhh!! This is agrivating. I installed the tightVNC RPM, seemed to work fine. but when I type in the folllowing at the terminal:

"vncviewer -compresslevel 0.9 -fullscreen 192.168.0.1"

I get this:

VNC viewer version 3.3.3r1

usage: vncviewer [<options>] <host>:<display#>
vncviewer [<options>] -listen [<display#>]

<options> are standard Xt options, or:
-shared
-viewonly
-fullscreen
-passwd <passwd-file>
-encodings <encoding-list> (e.g. "raw copyrect")
-bgr233
-owncmap
-truecolour
-depth <depth>

Wont let me go any further. I think that I may be running RealVNC instead of TightVNC, can I force it to use tVNC somehow?

-LBB

yes. you probably have to uninstall the realvnc rpm.
in the shell
rpm -e package_name ( i donth know what version of realvnc you have)
Then if you istalled tightvnc it might not be a bad idea to uninstall and reinstall that. (Just to be safe) then try it

Ethernet 100 megabit (11.92 megabytes/sec) is not fast when transferring huge graphic files every 16 ms (60 frames per second for NTSC). You need to use compression but this can effect the master computer's performance. Playing video files takes a lot of processor usage time. If you are viewing a video file and sending compressed VNC packets, these will take all the computer resources. If your dream computer has dual processors or more and 1 gigabit ethernet, you would not have a problem. Also setting a low resolution like 800 X 600 or even better 640 X 480 for the VNC server and low depth like 16 bits, your computer will have better performance.

I don't know what programming language the LINUX VNC viewer is written. If its JAVA, expect slow performance.

I unninstalled rVNC, and tVNC, and reinstalled tVNC. Still not working! When I run
vncviewer -compresslevel 0.9 192.168.1.0
I still get
VNC viewer version 3.3.3r1
But when I 'man vncviewer' I get the manual page for tightvnc. I know this because the manual says I can use '-compresslevel'.

Am I spelling something wrong maybe, or the wrong word order?
Should I be rebooting after I uninstall a package?.

I dont need perfect response time. I will try to lower the refresh to 30fps or even 10 if it helps. I also want to do some compression to increase speed. Single processor, 2.4 Ghz, but I've got a great graphics chip to handle the video.
I've never thought about gigabit. Can that run over my existing cables? (Cat5.. E I think)

-LBB

In Windows you should always reboot when installing or unistalling programs.

If you want gigabit ethernet, you need to change your hardware. 32-bit gigabit ethernet cards doesn't output their maximum speed. 64 bit gigabit ethernet will output their maximum speed. Cat-5e can handle gigabit ethernet though there is CAT-6. I suggest do some research on CAT-6 from the companies that supply it. You will also need to upgrade the hubs or switches to handle 1 gigabit ethernet.

Like I said in the last post. With compression, your computer that is being a VNC server will become slower even with a 2.4 gigahertz processor. Also the video card has nothing to do with it. Everything (video file playing, graphics editing, etc) on the VNC server is being process. The client system (your notebook computer) only sends commands to the VNC server and display what the VNC server on its screen. What resolution are you running the VNC server at.

Have you used Netmeeting or Gnomemeeting. Its the same thing that the VNC programs are doing.

Sorry, I can not help you installing VNC viewer. The viewer program could have made a symbolic link to the directory. Find out where it is going if it is a symbolic link. You can type whereis vncviewer