Re: [jazzplusplus-devel] Starting jackd on Mandriva

[D.B. M. <db...@ho...>]

Greetings,


----------------------------------------
> Date: Sun, 18 May 2008 22:06:21 -0700

> Subject: Re: [jazzplusplus-devel] Starting jackd on Mandriva
> 
> PS = Pete Stieber
> PS>> Kevin,
> PS>>
> PS>> I loaded qsynth & qjackctrl on my Mandriva 2008.0 disk,
> PS>> but every time I attempt to start the jack daemon using
> PS>> qjackctrl I get...
> PS>>
> PS>> 16:25:03.989 Startup script terminated with exit status=32512.
> PS>> 16:25:03.990 JACK is starting...
> PS>> 16:25:03.990 /usr/bin/jackd -R -dalsa -dhw:0 -r48000 -p1024 -n2
> PS>> jackd 0.107.2
> PS>> Copyright 2001-2005 Paul Davis and others.
> PS>> jackd comes with ABSOLUTELY NO WARRANTY
> PS>> This is free software, and you are welcome to redistribute it
> PS>> under certain conditions; see the file COPYING for details
> PS>> JACK compiled with System V SHM support.
> PS>> cannot use real-time scheduling (FIFO at priority 10) [for thread
> PS>> -1210526016, from thread -1210526016] (1: Operation not permitted)
> PS>> cannot create engine
> PS>> 16:25:04.003 JACK was started with PID=24050.
> PS>> 16:25:04.037 JACK was stopped successfully.
> PS>> 16:25:04.038 Post-shutdown script...
> PS>> 16:25:04.038 killall jackd
> PS>> jackd: no process killed
> PS>> 16:25:04.446 Post-shutdown script terminated with exit status=256.
> PS>> 16:25:06.135 Could not connect to JACK server as client. - Overall
> PS>> operation failed. - Unable to connect to server. Please check the
> PS>> messages window for more info.
> PS>>
> PS>> Is this illustrating the need for a RT kernel you mentioned before?
> 
> DM = D.B. Moore
> DM> Pete,
> DM>
> DM> As some of my docs touch on this area (or will do ;-),
> DM> I'm actually interested in getting some depth on this
> DM> issue vis-a-vis how different linux distro vendors are
> DM> configuring their 'stock' kernels...
> DM>
> DM> It'd help me a lot here if you could send me your
> DM> (current) kernel's .config file..  (or else, send
> DM> me /proc/config.gz if the madriva kernel has this
> DM> option enabled)....and I can have a closer look at
> DM> this and conclude the mandriva kernel makeup.
> 
> I believe I attached what you want.
> 
> I'm getting closer on Mandriva.  Have qjackctrl displaying something and 
> I'm downloading soundfonts.  It's tough to test and code at the same time.
> 


Yep, sure is....and look, I know you probably think I'm doing enough already,
 but if there's anything I can do to get testing bits done, I do find it a refreshing
break from writing...which is refreshing break from testing....and I've got the time.

Of course, your fight with qsynth & co was all your own there, stuck in the position where
you can't test the blessed code you've just written unless you fix that first...catch22.

However, I had none of this stuff installed here either when I started out,
and relative to -my- experience getting qsynth & co up and running wherein
it actually surprized me to work almost out-of-the-box, your experience in
what I describe as a 'bad' experience, and it would seem that Kevin has had
one of these too...and from my documentor's point of view, this is 'real, live
users' experience' information I can trust, and use in the docs to help users
out specifically and quickly relative to what linux distro they happen to be
using....ie; Kevin and yourself are supplying me this info regarding mandriva,
I do my own debian 4.0 testing for this here...etc..

I wanted this stuff to be part of the docs anyway, because Bob already 
raised this in another thread....but right here, it appears to report Pete's
situation back to him. I looked at your kernel config, these are the relevant
sections in your linux resulting in the qsynth error message ;

//my comments


CONFIG_HZ_1000=y
CONFIG_HZ=1000

//you DO have the right HZ


# CONFIG_PREEMPT_NONE is not set
CONFIG_PREEMPT_VOLUNTARY=y
# CONFIG_PREEMPT is not set
# CONFIG_PREEMPT_BKL is not set

//I haven't looked at qsynth code, but my guess is the above
//is the show-stopper. 'VOLUNTARY' = normal 'Desktop' preemption
//'Low-latency Desktop requires CONFIG_PREEMPT=y (as I do)


CONFIG_DEFAULT_IOSCHED="cfq"

//not actually how sure this one matters...I use DEADLINE
//myself as I'm more interested in linear performance


CONFIG_TICK_ONESHOT=y
CONFIG_NO_HZ=y
CONFIG_HIGH_RES_TIMERS=y

//I don't use the 'dynamic ticks' stuff
//I believe one needs the HIGH_RES_TIMER set like you have


I believe this accounts for what you're seeing with qsynth.


Regards,

Donald B
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