linuxaudio.org

------=_Part_82_4338280.1201252448402

Content-Type: text/plain; charset=ISO-8859-1

Content-Transfer-Encoding: quoted-printable

Content-Disposition: inline
2008/1/25, Florent Berthaut :

quoted text
>

>  Fernando Lopez-Lezcano a =E9crit :

>

>

> Ok finally, i tried to disable the second core ( i have a dual core

> 2GHz) and things get really better this way, i can lauch more

> applications with 4,8ms latency and no xruns. I had already disabled

> cpuspeed but it looks like it was not enough.

>

>  That points to a realtime kernel problem with (probably) timekeeping in

> two core processors (ie: "time of day" is not perfectly synchronized

> between the processors so that if jack migrates from one to another it

> appears as there has been too much delay and things don't work as

> intended). I have seen this happen in 2.6.23.x + rt14.

>

> What happens if you boot dual core with the "idle=3Dpoll" kernel

> parameter? (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.

>

> Florent

>

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

the general performances ?

Thanks
Mysth-R
>

quoted text
>

--=20

*

***************************************************************************=

************

*  {^_^} Mysth-R {^_^}

*

* http://myspace.com/mysthr

* http://myspace.com/aideauditive

* http://mysthr.free.fr  =3D> Site d=E9di=E9 =E0 l'audio sous Fedora/Planet=

CCRMA.

*

***************************************************************************=

************
------=_Part_82_4338280.1201252448402

Content-Type: text/html; charset=ISO-8859-1

Content-Transfer-Encoding: quoted-printable

Content-Disposition: inline
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

-- * *****************=

***********************************************************************=

  {^_^} 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.=

* *************************************************************************=

**************
------=_Part_82_4338280.1201252448402--