Re: Changing Kernel thread priorities

[Nicholas Mc Guire]

On Tue, 07 Jun 2011, Thomas Gleixner wrote:

> On Tue, 7 Jun 2011, Peter Zijlstra wrote:
> > On Tue, 2011-06-07 at 13:02 +0200, Remy Bohmer wrote:
> > > Well, I 100% agree that it must be under full userspace control to be
> > > able to set the priorities. But, the kernel default assumption of
> > > starting everything at 50 is wrong as well.
> > > Imagine the following situation:
> > > * Realtime application is running and has threads active in the range
> > > of prios 20 - 90.
> > > * Now bring up a network device, it immediately starts spamming the
> > > system at prio 50 _before_ you have the chance to set it below 20 by
> > > means of chrt.
> > > * RT behaviour is gone!
> > 
> > Good point I guess, Thomas should we default to 1 for everything?
> 
> No objections.

I think that splitting the range makes more sense - you are now potentially
reverting the argument brought up before.

"My drivers behave properly until I load any RT-task"

hofrat
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