[LAD] jack, kernel, etc. versions & priorities

Hello, I had a great performing linux audio setup until I had to move to a newer kernel to get some hardware on a new motherboard to work. Now I can't seem to get decent performance and thought it might be helpful if folks could chime in with what versions, etc. they are using with decent success. In particular I'm having a very challenging time with Linux Sampler, which I had previously working very solidly but now regardless of numerous jack/ls version permutations segfaults when I create a jack driver in ls. Thanks! -Garett Kernel version? RT patch? Preemption mode? Audio hardware IRQ scheduling policy and priority? Alsa version if different from kernel? Jack version, scheduling policy and priority? Linux Sampler version (or cvs date), scheduling policy and priority?