On Sat, Apr 4, 2015 at 8:13 PM, Adrian Knoth <a...@drcomp.erfurt.thur.de> wrote:
> Not enough information. I recommend starting jackd with strace > Done - apologies for the delay. Strace output available[1], but the most interesting part copied here: sched_get_priority_min(SCHED_FIFO) = 1 sched_setscheduler(0, SCHED_FIFO, { 1 }) = -1 EPERM (Operation not permitted) write(2, "\nJACK is running in realtime mod"..., 87 JACK is running in realtime mode, but you are not allowed to use realtime scheduling. ) = 87 > This code tries to call sched_setscheduler() with SCHED_FIFO. My bet is > that your "almost vanilla kernel" fails to fulfil this request, but > strace will tell you for sure. > By "almost vanilla" I meant the Arch linux packaged version - I didn't change the config myself (and Arch aims to be true to vanilla). A very accurace prediction though - indeed sched_setscheduler() is causing a return of -1. This is running as root though - so something is wrong here. > The question is why said call should fail. The only thing that comes to > my mind are CGROUPS. Maybe your old kernel comes without, the new kernel > supports them and the configuration is set in a way that disables > SCHED_FIFO by default. > Perhaps - I'm not experienced with cgroups or such, if anybody has any test ideas for me I'll try them out? Cheers, -Harry [1] http://openavproductions.com/tmp/straceJackd.txt
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