[ardour-users] OT - 2.6.11 kernels for audio

[Mark Knecht]

Thanks Fernando. I found that a few minutes ago. Good to know at least
I'm Googling out the right stuff.

Can you tell me what set of patches you deem necessary to make a good
audio kernel these days? Last October there were 4 patches that I
applied. I've forgotten what they all do:

1) I started with 2.6.8 from kernel.org I believe
2) Added 2.6.9_rc2 which I think got 2.6.8 up to 2.6.9_rc2.
3) I added 2.6.9-rc2-mm4 - I don't know what that is.
4) I then added VP-2.6.9-rc2-mm4-S7. I think that was Ingo's patch
5) Lastly I added the LSM patch - realtime-lsm-2.6.8.1 which I guess
gives me access to all of this as a user, correct?

What part of those is still required? All? Has anythign made it into
the kernel proper these days?

Thanks,
Mark

On 11 Apr 2005 13:14:23 -0700, Fernando Lopez-Lezcano
<nando at ccrma.stanford.edu> wrote:
> On Mon, 2005-04-11 at 13:03, Mark Knecht wrote:
> > On Apr 11, 2005 12:56 PM, Rob Fell <robin.fell at ntlworld.com> wrote:
> > > Mark Knecht wrote:
> > > >    Anyone doing 2.6.11 yet? What's your experience? How did you patch
> > > > to make Ardour work well.
> > >
> > > I'm currently running 2.6.11-rc4-RT-V0.7.39-02.  Stock sources plus
> > > Ingos RT patches.
> >
> > That sounds about like what I'm looking for. My current kerenl before
> > trying to jump up to 2.6.11 is 2.6.9-rc2-mm4-VP-S7 and then
> > variations. (-lsm, noACPI, etc.)  I did all of this last October and
> > then promptly forgot what's what. Every time this is a learning
> > experience.
> >
> > Can you point me toward Ingo's stuff. I'm trying to Google for it but
> > I seem to be buried in nothing but lkml emails...
> 
>   http://people.redhat.com/~mingo/realtime-preempt/
> needs 2.6.12-rc2
> (currently building it :-)
> -- Fernando
> 
> > > Since I'm using the ZLM on my delta-1010 I don't run particularly low
> > > latencies - I have been able to get reliable 5ms(ish) on my now ageing
> > > 1.3GHz Duron.  Apparently there is an issue with my kernel between ext3
> > > and low-lat performance - which explains why I'm not able to go below
> > > 5ms(ish) reliably.
> > >
> > > If I were doing it again I'd either (a) check-out the Gentoo kernels, or
> > > (b) pick a kernel to match Ingos latest RT patchset.
> >
> > Yeah, I should probably pay more attention to possibly the ck kernel?
> > Any comments from your perspective on which kernel might be the best
> > for running low latency audio as a normal user?
> >
> > Thanks much,
> > Mark
> 
>