Re: [gentoo-user] Nice level for X11

[Abraham Gyorgy]

"by selecting a suitable
process scheduler and configuring your HZ to 1000"

It is already done. (the Hz).
Well thanks very much for these information (you and other people on this
thread). I believe what you say but I believe too what I see with my own
eyes. If we will ever meet on a Gentoo conference or anything, I'll show my
faster X11 with negative nice level. ;) Anyway I'm running it with default
nice level (0) for some days because X11 is very unstable with -15 niceness.

2008/5/15 Alan McKinnon <alan.mckinnon@×××××.com>:

> On Thursday 15 May 2008, Abraham Gyorgy wrote:
> > I know X runs always as root. But setting the X server process'
> > priority to for example -10 makes graphical software response faster.
> > It works for me!! (no matter the system hangs sometimes :).
> > I think you have a fast machine, try it with a very slow computer
> > (sempron processor and radeon xpress200m+fglrx).
>
> Please don't top post in this forum.
>
> Look, you are talking about running the X session as root. That doesn't
> make sense as an "X session" is e.g. gnome or kde which runs as the
> user. I fail to see how the X client programs have any effect on the
> the responsiveness of the server, yet this is exactly what you are
> saying. Then you talk about vulnerabilities in the client apps with an
> implication that this can somehow affect the server which runs as root.
> But that is just not true, except if a client can exploit a
> vulnerability in the server (which is to my mind not what you are
> saying).
>
> Finally, there is very little point in debating this topic. If Linus
> says that niceness has never had a whole lot of effect in Linux, and
> that perceived differences are entirely due to reducing the latency a
> specific app experiences, then I am going to go with the one guy that
> knows the subject and consider your experiences to be anecdotal.
>
> You'll probably get better results with X by selecting a suitable
> process scheduler and configuring your HZ to 1000
>
>
>
>
> > 2008/5/14 Alan McKinnon <alan.mckinnon@×××××.com>:
> > > On Wednesday 14 May 2008, Josh Cepek wrote:
> > > > > lapitopi gyuszk # snice -15 X
> > > >
> > > > As already pointed out, running process with a nice value less
> > > > than 0 can only be done by root, and it's usually a really bad
> > > > idea to run your entire X session as root. X (and applications
> > > > running under X) involve a lot of code, and vulnerabilities can
> > > > exist in this code.
> > >
> > > I think you don't know how X runs.
> > >
> > > X *always* runs as root on Linux so whether you nice it to 19 or
> > > -19 is not relevant. It was only very very recently that someone
> > > got X to run as a user. Do you disagree or should I elaborate?
> > >
> > > --
> > > Alan McKinnon
> > > alan dot mckinnon at gmail dot com
> > >
> > > --
> > > gentoo-user@l.g.o mailing list
>
>
>
> --
> Alan McKinnon
> alan dot mckinnon at gmail dot com
>
> --
> gentoo-user@l.g.o mailing list
>
>