Re: jerks

[John Rigg <ad@carbon-black.co.uk>]

On Thu, Dec 08, 2005 at 10:41:47AM -0700, Glenn English wrote:
> I'm trying to make a Digital Audio Workstation (DAW) out of a SUN W2100z
> (dual AMD64).
> 
> Every few seconds, at seemingly random times, everything freezes for
> ~50ms. Even the mouse. Sometimes. Reliable at the first card moved in
> Aisle Riot Solitaire and when Jack is running. Often when I'm typing
> email (chars don't get from the keyboard to the screen).
> 
> I know that's not much of a description, but I don't know where to start
> looking for this. I'm assuming interrupts are being disabled entirely
> momentarily. My background says it's time for a bus monitor, but I don't
> have one handy.
> 
> This happens with a 2.6 kernel from the current updated Sarge or a 2.4
> from DeMuDi 1.2.1 distro.

Could this be the libc NPTL bug? Sarge has a buggy version of glibc with
a broken NPTL implementation (don't know about DeMuDi 1.2.1).
If so, threaded apps won't perform properly - I switched to sid for this
reason.
Workaround is to set LD_ASSUME_KERNEL=2.4.22 for jackd and other audio
apps. In sid it's fixed, and you'll also get the extra benefits of
gcc-4.0's better AMD64 optimisation.

John


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