Re: [PATCH]sched: Isochronous class v2 for unprivileged soft rtscheduling

[Jack O'Quin]

Con Kolivas <kernel@xxxxxxxxxxx> writes:

>> Jack O'Quin wrote:
>>> You're really getting hammered with those periodic 6 msec delays,
>>> though.  The basic audio cycle is only 1.45 msec.

> Con Kolivas wrote:
>> As you've already pointed out, though, they occur even with
>> SCHED_FIFO so I'm certain it's an artefact unrelated to cpu
>> scheduling.

Yes.  Your scheduler works well.

> Ok to try and answer my own possibility I) remounted reiserfs with the
> nolog option and tested with SCHED_ISO

That's discouraging about reiserfs.  Is it version 3 or 4?  Earlier
versions showed good realtime responsiveness for audio testers.  It
had a reputation for working much better at lower latency than ext3.

How do we report this problem to the developers?

> That the 20s periodic thing delay has all but gone. Just one towards
> the end (no idea what that was).

I need to figure out how to use Takashi's ALSA xrun debugger.  It
prints the kernel stack when an xrun occurs.

-- 
  joq
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