Hello,
I am using Fedora Core 3, 32bit SMP-system, xorg via default Fedora RPMs.

My problem is: I am using xvfb for a java-application (ProjectX) to demux
multimedia files. And I found out that:

If a "nice 19"-process, which takes all the idle-cpu capacity, is running on the
server, xvfb do not give the java-application any free cpu capacity. Only if
there is "idle" cpu capacity, xvfb give it to the java-application.


Example:
Start a setiathome client on the server (or any other heavy process) with:
nice -n 19 ./setiathome

Than this process will use the whole free cpu-capacity if it is not needed
(lowest nice-level), so "idle" cpu-capacity will be zero and "nice" cpu-capacity
to the maximum available.

Now try to start any process with also heavy cpu-usage in xvfb. It will not work
... or better: it will work, but without any cpu-capacity, taking hours to finish :(

Even if all available cpu-capacity is only used by a nice-process on the lowest
nice-level, xvfb do not take any cpu-capacity from this process to give it to
the "non nice"-process which was startet in the xvfb.

With XFree xvfb on Fedora Core 1, this worked.

Another thing: if you stop all "heavy" nice-processes on the server and the
application running in xvfb take all needed cpu-capacity, they are not shown in
the "top"-view or with correct cpu-usage under "ps -aux".
You can only see that the process is taking cpu-capacity over the "user"
cpu-capacity in the "top"-view.

Maybe this problem is allready fixed in 6.8.2, I don't know. It would be
wonderfull if an update would be available for 6.8.1 :)

This is the RPM-version I use:

[root@baghira ~]# rpm -q xorg-x11
xorg-x11-6.8.1-12.FC3.21
[root@baghira ~]# rpm -q xorg-x11-Xvfb
xorg-x11-Xvfb-6.8.1-12.FC3.21
[root@baghira ~]#

Sorry for my english. If you have any questions, please contact me.

Thank you,
bye Alex