[LAU] : jack CPU % is going crazy !

Hello list, Since I have installed Gentoo I got some issue with JACK. I am using Jackdmp When I run qjackctl all is right but the CPU percent, in spite of staying around 3 or 4% it is moving : 4% then 3 %, then it passes to 27% then 10% and 53% and 4% ... I don't understand very well what it is going wrong. My config : gentoo 64 bits version on a Dell Insprion 9400 Intel Core Duo 2 T7200 with 2 Go Ram. Firstly I had installed jack 0.109 and the issue was worse that jackdmp :sometimes CPU load until 80% The kernel I use was compiled by my own. Perhpas I forgot an option or something... uname -a : 2.6.24-rt1 #4 SMP PREEMPT RT Sun Mar 16 21:42:41:CET 2008 x86_64 Intel(R) Core(TM)2 CPU T7200 @ 2.00GHz GenuineIntel GNU/Linux Thank you very much for your help. Cheers, Mysth-R -- * *************************************************************************************** * {^_^} Mysth-R {^_^} * <= Aide Auditive => * * http://myspace.com/mysthr * http://myspace.com/aideauditive * http://mysthr.free.fr/Joomla => Site dédié à l'audio sous Fedora/PlanetCCRMA. * ***************************************************************************************