Re: Real-Time Preemption, -RT-2.6.12-final-V0.7.50-24

[William Weston]

On Fri, 1 Jul 2005, Lee Revell wrote:

> On Fri, 2005-07-01 at 18:46 -0700, William Weston wrote:
> > FWIW, I'm still seeing the SMT scheduling? meltdown issues with
> > -50-42.  
> > Running two instances of 'dd if=/dev/zero of=/dev/null bs=65536'
> > instead 
> > of 'burnP6' results in the same behavior.  Here's a quick recap:
> > 
> > - Start (or login to ) X.
> > - Start an X app that constantly updates the screen, like wmcube, or
> > vlc. 
> 
> Which video driver is X using?  What nice value is the X server running
> at?

Hardware is Intel 82865G (integrated) with DRM i915 1.1.0 20040405 and 
xorg-3.8.2 i810 driver, running at nice 0, priority 15.  Should I bump the 
priority up?  To realtime?

> Does adding:
> 
> Option "NoAccel"
> 
> to the Device section of your X config file make any difference?

Disabling the dri and drm modules didn't help.  I'll turn on NoAccel when 
I'm back in the office on Tuesday.

> (on most systems X is the only thing besides the kernel that can access
> hardware directly, which can cause problems)

So would running X through the framebuffer device be the way to go for 
stability under realtime?  It's been a couple years since I've used fb.

--ww
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