VNC quite slow ...

James Gray james_gray "at" open-channels.com
Tue, 22 Aug 2000 10:33:38 +0000


Better still, use a command line FTP transfer and it will tell you the
transfer time and average transfer speed.  The basic question remains
though; is this a performance issue on one of the machines (server and/or
client) or is it a network issue (bandwidth/routing etc).

Let's assume this is a system performance issue.  From the original post in
this thread, it seems the Linux machine is the VNC-server and is being
connected to by the Wintel box.  In my experience, if you are already
running an X server on the Linux end and then start Xvnc (the VNC server)
the RAM available falls through the floor - but that was only on 128Mb RAM
on Linux.  However, when I kicked XFree86 out of the equation it was quite a
lot faster.

If on the other hand this is a network issue, there are a few things you can
to try and isolate the performance problem.  Try a ping to the opposite
machine and see if the times are sub 10ms (for a LAN, even through
routers/firewalls this is pretty standard ping times).  Do a traceroute
(from Linux) an a tracert from NT to the opposite machine - make sure it
isn't routing via the Internet or any other networks, it should be as direct
as possible in a well configured network.  If you think you've found a
network problem have a chat with network engineering/network admin and see
if they can solve the prob for you.

Good Luck,

James

-----Original Message-----
From: owner-vnc-list "at" uk.research.att.com
[mailto:owner-vnc-list "at" uk.research.att.com]On Behalf Of Gustafsson,
Bjorn
Sent: Friday, 18 August 2000 10:41 PM
To: 'vnc-list "at" uk.research.att.com'
Subject: RE: VNC quite slow ...


And also, a 100Mbit Net is no guarantee for anything. How many computers in
total? How much "normal workload" on it? Copy a large file (100+ mb) between
the two users and time it. How long does it take?

-----Original Message-----
From: J Peaks [mailto:jeremy "at" jerpeaks.freeserve.co.uk]
Sent: den 18 augusti 2000 12:26
To: vnc-list "at" uk.research.att.com
Subject: Re: VNC quite slow ...


Which system has the VNC server on it, and which has the viewer?

If WinNT has the server on it, does it have features such as wallpaper,
patterns, fontsmoothing etc turned on?

Jeremy Peaks

----- Original Message -----
From: Stefan Rosik <s01q "at" uni-bremen.de>
To: <vnc-list "at" uk.research.att.com>
Sent: 17 August 2000 14:55
Subject: VNC quite slow ...


> Dear Members,
>
> I am using VNC from a WinNT Server (2xPIII-700) to a Linux Box (PII-400)
> over a 100Mbit Net. I could see that the window refresh and the mouse
> /keyb reaction on the remote site is not that fast. Can anyon tell me
> how to speed this up ??
>
>
>
> with kind regards
>
> Stefan
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