Apparently I'm not the only one to notice it, based on my web search. There is a noticable slowdown of vnc client response in debian 11 compared to debian 10.
Using vnc connection right now and almost unusable keyboard lag. Also seeing sporatic
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error in the server log
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[Discussion] vnc performance degradation
- kent_dorfman766
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- kent_dorfman766
- Posts: 536
- Joined: 2022-12-16 06:34
- Location: socialist states of america
- Has thanked: 58 times
- Been thanked: 70 times
Re: [Discussion] vnc performance degradation
always traditional X11, not a fan of wayland...plus not supported by my preferred window managers.
server side is x11vnc as
client is tigervnc. Tried a variety of different client side options for compression and lowering of color depth to no avail.
Networking is not an issue since I've got a better network than most companies provide and my connections are all hardwired.
This seems a version regression issue, as noted by others online who are experiencing slowdowns under similar conditions.
server side is x11vnc as
Code: Select all
# ----------------------------------------------------------------------
runvnc() {
/usr/bin/x11vnc -display $1 -repeat -noxrecord -nopw \
-listen 10.1.11.102 -rfbport ${2} -scale 0.96 -solid ${3} -capslock \
-forever -noxdamage > ${HOME}/.vnc/vnc${1}.log 2>&1 &
}
runvnc :0.0 5900 \#807040
runvnc :0.1 5901 \#407080
Networking is not an issue since I've got a better network than most companies provide and my connections are all hardwired.
This seems a version regression issue, as noted by others online who are experiencing slowdowns under similar conditions.
Re: [Discussion] vnc performance degradation
This post put me on the right track:
patch "0003-rfb-increase-update-buf-size.patch: Allow larger screen sizes" in libvncserver either breaks x11vnc or its usage with certain clients.
Personally, I have been using ssvncviewer on macOS and Debian 10.
The patch was already in Bookworm since libvncserver-0.9.13+dfsg-4 and has more recently been backported into Bullseye's version 0.9.13+dfsg-2+deb11u1.
Removing the patch and recompiling the libvncserver package, as well as x11vnc fixed the issue for me.
I am going to try reporting the issue with the x11vnc people hoping that it can be fixed there.
patch "0003-rfb-increase-update-buf-size.patch: Allow larger screen sizes" in libvncserver either breaks x11vnc or its usage with certain clients.
Personally, I have been using ssvncviewer on macOS and Debian 10.
The patch was already in Bookworm since libvncserver-0.9.13+dfsg-4 and has more recently been backported into Bullseye's version 0.9.13+dfsg-2+deb11u1.
Removing the patch and recompiling the libvncserver package, as well as x11vnc fixed the issue for me.
I am going to try reporting the issue with the x11vnc people hoping that it can be fixed there.
- kent_dorfman766
- Posts: 536
- Joined: 2022-12-16 06:34
- Location: socialist states of america
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Re: [Discussion] vnc performance degradation
@jmechnich
Cool! Nice to see that someone understands what I was getting at. I'm not in a spot where I want to manually build the vnc clients or viewer but will keep an eye on this.
Cool! Nice to see that someone understands what I was getting at. I'm not in a spot where I want to manually build the vnc clients or viewer but will keep an eye on this.
Re: [Discussion] vnc performance degradation
I have opened an issue with x11vnc on GitHub: https://github.com/LibVNC/x11vnc/issues/220
Re: [Discussion] vnc performance degradation
Quick update: apparently this is not caused by upstream as it can be fixed by locally rebuilding the package.
I have closed the issue on GitHub and submitted a bug to the Debian x11vnc maintainers.
I have closed the issue on GitHub and submitted a bug to the Debian x11vnc maintainers.
Re: [Discussion] vnc performance degradation
This has been fixed with x11vnc 0.9.16-9 and should be backported to bullseye (see Bug #1027043)
Last edited by jmechnich on 2023-02-07 18:09, edited 1 time in total.