[ardour-users] low latency kernel problems

[philicorda]

On Wed, 2006-05-17 at 12:19 -0700, Mark Knecht wrote:
> On 5/17/06, Fernando Lopez-Lezcano <nando at ccrma.stanford.edu> wrote:
> > On Wed, 2006-05-17 at 02:26 -0400, George Chan wrote:
> > > Hi again,
> > >
> > > One more thing just to clarify.
> > >
> > > The "NMI watchdog" issue only happens on multiple CPU systems.
> > >
> > > If you have a single core, single CPU, you will not have this issue.
> >
> > I'm running 2.6.16-rt17 on dual core X2 Athlons without problems... (you
> > do have to tweak the patches to make them patch cleanly on later
> > 2.6.16.x versions of the kernel).
> >
> > -- Fernando
> 
> On my single core AMD64 the 2.6.15-rt kernels boot, as do the
> 2.6.16-gentoo kernels. Using the new Gentoo pro-audio overlay I tried
> building 2.6.16-rt22 yesterday. I hangs early in the boot when it's
> installing the IO Schedulers.

I have 2.6.16-rt22 working fine on my AthlonXP. (Gentoo Gcc 4.1.0)
The only IO scheduler compiled in is 'deadline'.

#
# IO Schedulers
#
CONFIG_IOSCHED_NOOP=y
# CONFIG_IOSCHED_AS is not set
CONFIG_IOSCHED_DEADLINE=y
# CONFIG_IOSCHED_CFQ is not set
# CONFIG_DEFAULT_AS is not set
CONFIG_DEFAULT_DEADLINE=y
# CONFIG_DEFAULT_CFQ is not set
# CONFIG_DEFAULT_NOOP is not set
CONFIG_DEFAULT_IOSCHED="deadline"


The Gentoo pro-audio overlay is a fine thing isn't it?
Respect is due to those who put it together.

> 
> I have not yet tried anything earlier than 2.6.16-rt22 so I've not
> tried giving Ingo any feedback. I did hear from one other person that
> he had exactly the same failure with all 2.6.16-rt kernels on his
> machine.
> 
> - Mark
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