Re: [LAU] xruns with m-audio fast track pro on fedora 8 ccrma ->kernel 2.6.22 , periods/buffer = 3 , proper rtirq setup, disable 2nd core

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To: Florent Berthaut <hitmuri@...>
Cc: Ingo Molnar <mingo@...>, A list for linux audio users <linux-audio-user@...>
Date: Friday, January 25, 2008 - 9:14 am

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2008/1/25, Florent Berthaut :

Hi, I would like to know how did you disable your 2nd core ? Does it affect
the general performances ?
Thanks

Mysth-R

>

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* {^_^} Mysth-R {^_^}
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* http://myspace.com/mysthr
* http://myspace.com/aideauditive
* http://mysthr.free.fr =3D> Site d=E9di=E9 =E0 l'audio sous Fedora/Planet=
CCRMA.
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2008/1/25, Florent Berthaut <hitmuri@no-log.org>:

=20
=20

Fernando Lopez-Lezcano a =E9crit :
Ok finally, i tried to di=
sable the second core ( i have a dual core2GHz) and things get really b=
etter this way, i can lauch more
applications with 4,8ms latency and no xruns. I had already disabledcpu=
speed but it looks like it was not enough.

That points to a realtime kernel problem with (probably) timekeeping=
intwo core processors (ie: "time of day" is not perfectly sy=
nchronizedbetween the processors so that if jack migrates from one to a=
nother it
appears as there has been too much delay and things don't work asin=
tended). I have seen this happen in 2.6.23.x + rt14. What happens i=
f you boot dual core with the "idle=3Dpoll" kernelparameter? =
(I assume this happens with 2.6.22.x).
-- Fernando

Looks like it solves the problem, even the 2.6.23.x (latest ccrma
kernel) works well with this parameter.
Thanks.

FlorentHi, I would like to know how did you dis=
able your 2nd core ? Does it affect the general performances ?ThanksMysth-R
-- * *****************=
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  {^_^} Mysth-R {^_^}** http://myspace.com/mysthr
* http://myspace.com/aideauditi=
ve
* http://mysthr.free.fr&nbs=
p; =3D> Site d=E9di=E9 =E0 l'audio sous Fedora/PlanetCCRMA.=
* *************************************************************************=
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Messages in current thread:
Re: [LAU] xruns with m-audio fast track pro on fedora 8 ccrm..., Florent Berthaut, (Wed Jan 23, 12:07 pm)
Re: [LAU] xruns with m-audio fast track pro on fedora 8 ccrm..., Fernando Lopez-Lezcano, (Wed Jan 23, 5:26 pm)
Re: [LAU] xruns with m-audio fast track pro on fedora 8 ccrm..., Fernando Lopez-Lezcano, (Thu Jan 24, 9:25 pm)
Re: [LAU] xruns with m-audio fast track pro on fedora 8 ccrm..., Mysth-R, (Fri Jan 25, 9:14 am)
Re: [LAU] , Matthias , (Wed Jan 23, 2:26 pm)