On Thu, 2007-12-20 at 09:13 +0100, Roger Oberholtzer wrote:
> On Wed, 2007-12-19 at 23:45 -0800, Greg KH wrote:
> 
> > > The normal X server is not recompiled to expect the RT kernel.
> > 
> > That's because it is not a kernel driver, yet :)
> 
> Of course. My mistake. 
> 
> > > Should there be similar issues with that as with the nvidia driver?
> > 
> > Yes there will be.
> > 
> > > Does this apply to vmware as well? 
> > 
> > Yes.
> > 
> > _ANY_ kernel module will have to be recompiled to work properly with the
> > -rt kernel, just like any other kernel version we provide.
> 
> Sigh.. I need to make a second class of our own drivers.
> 
> > > > > Since I used YaST to install the nvidia driver, it
> > > > > should get updated when there is a new kernel. I do not want to mess
> > > > > that up to get it to work with the RT kernel variant. Should I just
> > > > > re-install the nvidia driver when running the RT kernel? I guess the 
> > > > > RT
> > > > > kernel is a parallel kernel, not really a new kernel.
> > > > 
> > > > What do you mean "new kernel"?  It's just a different variant, one for a
> > > > specific need.
> > > 
> > > If I get a kernel update, the YaST-based nvidia install claims that it
> > > will magically keep the nvidia driver working with each update.
> > 
> > That's a pretty bold claim :)
> 
> Indeed. But the SUSE nvidia driver install docs claim this is the case.
> 
> > Anyway, as the nvidia driver is closed source, I really have no idea how
> > it interacts with the kernel at all.   Heck, the fact that it even works
> > for anyone is amazing to me...
> > 
> > > I do not need to take action. The RT kernel, I am guessing, is not
> > > considered an update, which makes sense.
> > 
> > That's right, it is just another kernel "variant" like the -bigsmp
> > kernel is.
> 
> So did the nvidia driver not get installed into the RT kernel on purpose
> (it was not fully recompiled with -rt stuff) or by oversight? The end
> result may be what you want. But it would be nice if it was for the
> right reason.
> 
> -- 
> Roger Oberholtzer
> 

Hi, 

Many years ago i used a RT-os,
But when seeing you asking for videodrivers and vmware......

For real RT-applications, you should want to avoid unneeded IRQ's at all
time: barebone, no graphics (but serial console), no virtualisation, no
add-on hardware and as much as possible unneeded io on your mobo
disabled.


hw
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