[linux-audio-dev] Linux 2.6 not a latency panacea?

[Takashi Iwai]

At Thu, 14 Aug 2003 02:55:28 +0300 (EEST),
Kai Vehmanen wrote:
> 
> For example, one new approach to the problem SCHED_SOFTRR, see:
> http://www.xmailserver.org/linux-patches/softrr.html
> http://www.ussg.iu.edu/hypermail/linux/kernel/0307.1/1729.html
> 
> It's unlikely to get something like this enabled by default in the vanilla 
> kernel, but we might be able to get a kernel option (no patching!). But, 
> but, as you can see from the discussion, they are talking about totally 
> different things (how XMMS/realplayer performs)... 
> 
> ... basicly a way to get benefits of SCHED_FIFO but without need for root 
> privileges. Now we just need to push these to the standard kernel somehow.

i think the most benifit of soft-RR is that it doesn't bring your box
hanging up even if a RT-process gets into an infinite loop.  this will
help to sort out the problem when a JACK system freezes with
SCHED_FIFO.  (i.e. if it happens with soft-RR, it's a kernel/driver
bug :)

running by the normal user is an additional gift, for my eyes.
such a feature can be implemented with a wrapper (library), too,
as jackstart does.


Takashi