On Wednesday 03 October 2007, Frank Barknecht wrote: > Generally we have two kinds of kernels: The "vanilla" kernel as > downloadable on kernel.org and the same kernel, but patched with Ingo > Molnars RT-patches. The vanilla kernel, if configured properly with > CONFIG_PREEMPT etc., already gives very good performance in the low > latency department, enough for many users, even audio users. I run one > of these. Well, the vanilla kernel also has a CONFIG_HZ setting of i think 200hz per default. This is too little timing resolution for processes that rely on the system timer frequency being higher [some sequencers come to mind].. The "lowlatency" kernel in ubuntu thus has CONFIG_HZ set to 1000 and CONFIG_PREEMPT enabled. This might be good enough for some people.. For a truly reliable system (where you can count on no audio period being missed because you forgot to disable the damn updatedb cronjob) you need a system patched with ingo's realtime preemption patches and have it properly configured. E.g. situations where you record performances that are not repeatable.. Or you cannot afford to have a click because your signal goes over a 100000 Watt P.A. [Though i guess with vanilla jack you must not change any connections during the task because this might cause lost buffers [due to vanilla jackd doing some coarse grained locking], too - jackdmp might help].. Regards, Flo -- Palimm Palimm! http://tapas.affenbande.org _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo.cgi/linux-audio-user
