Influence on perlormances of client hardware

Gabe · Post by **Gabe** » 2006-02-07 09:40

Hello,

I use UltraVNC client with 2 computers, a desktop (P4 2.8GHz, 1GB RAM) and a laptop (P3 1.1 GHz, 512 MB RAM). The 2 clients and the server (1.2 GHz, 1GB RAM) are on the same switch, no more computer on this switch. The server aprt uses the video hook driver.
With the desktop all works fine, window scrolling is very fast and fluid. When I use the laptop I have big freezes of the screen. These freezes occur on the server side. I wonder what's the problem ?
* mouse events aren't transmitted to server ?
* does the video card influence on the client ? dedicated memory or not ?
* what are the hardware component on the client side that can change the behaviour from excellent to unacceptable ?

Thanks,
Gabe

Post by **Rudi De Vos** » 2006-02-07 10:47

WiFi ?

Gabe · Post by **Gabe** » 2006-02-07 11:08

- Swicth 10/100
- Ethernet 100MB/s cards, full duplex enabled, on all computers.

yleclerc · Post by **yleclerc** » 2006-02-07 14:41

What version of Windows?

What is the screen resolutions?

Gabe · Post by **Gabe** » 2006-02-07 14:44

on the 3 computers :
- Windows XP Pro SP2
- 1024 x 768, 16 bits colors
(same conclusions with 32 bits colors)

Gabe · Post by **Gabe** » 2006-02-08 10:09

No idea ?

This problem freezes our projet

rmoller · Post by **rmoller** » 2006-02-08 11:44

Try to forward the VNC traffic from server to laptop through the other client. Use repeater or rinetd from www.boutell.com. See if it changes anything.

Try to let the laptop use the other clients' switch port.
Try to let the laptop connect to server using RDP. Load it with traffic.
Try setting all NICs and switch to 10Mbit/sec

All the above things should clarify what the culprit is. It is unlikely to be the software. I suspect network noise because of faulty/mismatched NIC or NIC settings.

Good luck
Rasmus Møller

Gabe · Post by **Gabe** » 2006-02-08 12:16

rmoller wrote:Try to forward the VNC traffic from server to laptop through the other client. Use repeater or rinetd from www.boutell.com. See if it changes anything.

I've tried :
laptop --(ultraVNC)--> desktop --(ultraVNC)--> server
The laptop freeze, the same as without desktop in the middle.

laptop --(ultraVNC)--> desktop --(rinetd)--> server
Idem.

rmoller wrote:Try to let the laptop use the other clients' switch port.

no change

rmoller wrote:Try to let the laptop connect to server using RDP. Load it with traffic.

not tested. How ? RDP = Terminal Server ?

rmoller wrote:Try setting all NICs and switch to 10Mbit/sec

The freezes have disappeared when I connect with laptop. Refreshs are less frequent but there is no freeze.

rmoller wrote:All the above things should clarify what the culprit is. It is unlikely to be the software. I suspect network noise because of faulty/mismatched NIC or NIC settings.

Good luck
Rasmus Møller

Indeed the problem seems to come from net.

Gabe · Post by **Gabe** » 2006-02-08 12:28

Is this possible ? :
When I reduce the network speed to 10MB some (which ?) hardware or functionality on the laptop is less used and release the process.

How to point to the real problem ?

Gabe · Post by **Gabe** » 2006-02-10 15:37

tuning the TCP window size increases performances on the laptop, approaching the desktop ones.