LinuxQuestions.org
Welcome to the most active Linux Forum on the web.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Software
User Name
Password
Linux - Software This forum is for Software issues.
Having a problem installing a new program? Want to know which application is best for the job? Post your question in this forum.

Notices


Reply
  Search this Thread
Old 10-08-2003, 10:15 AM   #1
LinuxBlackBox
Member
 
Registered: Sep 2003
Location: Canada
Distribution: Slackware 9
Posts: 243

Rep: Reputation: 30
Question 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.

Thank you,
LBB
 
Old 10-08-2003, 11:36 PM   #2
dot_txt
Member
 
Registered: May 2003
Location: Chicago
Distribution: Slackware 10
Posts: 45

Rep: Reputation: 15
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.
 
Old 10-09-2003, 08:05 AM   #3
LinuxBlackBox
Member
 
Registered: Sep 2003
Location: Canada
Distribution: Slackware 9
Posts: 243

Original Poster
Rep: Reputation: 30
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
 
Old 10-09-2003, 09:06 AM   #4
LinuxBlackBox
Member
 
Registered: Sep 2003
Location: Canada
Distribution: Slackware 9
Posts: 243

Original Poster
Rep: Reputation: 30
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
 
Old 10-10-2003, 12:16 AM   #5
dot_txt
Member
 
Registered: May 2003
Location: Chicago
Distribution: Slackware 10
Posts: 45

Rep: Reputation: 15
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
 
Old 10-10-2003, 01:30 AM   #6
Electro
LQ Guru
 
Registered: Jan 2002
Posts: 6,042

Rep: Reputation: Disabled
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.
 
Old 10-10-2003, 08:06 AM   #7
LinuxBlackBox
Member
 
Registered: Sep 2003
Location: Canada
Distribution: Slackware 9
Posts: 243

Original Poster
Rep: Reputation: 30
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
 
Old 10-11-2003, 03:43 PM   #8
Electro
LQ Guru
 
Registered: Jan 2002
Posts: 6,042

Rep: Reputation: Disabled
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
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off



Similar Threads
Thread Thread Starter Forum Replies Last Post
PCI bus speed and video card speed juanbobo General 0 08-01-2005 02:13 PM
Gnome Update, Mouse Speed, Overall System Speed funaroma Linux - Newbie 2 08-04-2004 11:13 PM
cdrecord - trying to use high speed medium on low speed writer captain-cat Linux - Hardware 2 07-12-2004 07:27 PM
Is there a tool to monitor Internet connection speed and also network speed? xleft4dexy Linux - Networking 4 10-14-2003 11:29 PM
VNC - Selecting different WindowManagers with VNC cmfarley19 Linux - Software 0 04-16-2003 03:30 PM


All times are GMT -5. The time now is 08:27 AM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration