On Mon, Feb 16, 2015 at 1:49 PM, Josh Boyer <jwboyer@xxxxxxxxxxxxxxxxx> wrote: > On Mon, Feb 16, 2015 at 1:50 AM, drago01 <drago01@xxxxxxxxx> wrote: >> On Mon, Feb 16, 2015 at 6:23 AM, Diogo Campos (gmail) >> <diogocamposwd@xxxxxxxxx> wrote: >>> You've asked to make it easier but you've made no suggestions or proposals >>> on how it might be achieved. >>> >>> >>> Sorry if it seemed a random complaint. >>> >>> Fact is that I am a victim of this issue, so I really did not feel >>> comfortable to propose solutions at a technical level. >>> >>> Anyway, since you asked: >>> >>> 1- Install JACK. >>> >>> I think the package would be "jack-audio-connection-kit". >>> >>> 2- Set a list of standard and optimized initialization options for JACK. >>> >>> Most likely disabling the "realtime" option (with "--no-realtime"), since, >>> as far as I understand, the Fedora kernel does not have support for it. >> >> It does. The thing is that setting real time scheduling for an app is >> a privileged operation. Jack should use rtkit for that (like >> pulseaudio does). > > The Fedora kernel doesn't carry the -rt patchset, which is what most > people equate to "realtime" in the Linux world. I'm not sure what you > were thinking of here? Its not about the -rt patches (those would improve things for audio producers; but that's a different story) but what jack tries to do is simply set the scheduling policy of the process to SCHED_RR. Pulseaudio already does this (for the same reason) using rtkit: "RealtimeKit is a D-Bus system service that changes the scheduling policy of user processes/threads to SCHED_RR (i.e. realtime scheduling mode) on request. It is intended to be used as a secure mechanism to allow real-time scheduling to be used by normal user processes." So what I suggested is to change jack to use rtkit instead of requiring setuid or even full root privileges for it. Non of this require any kernel changes nor the -rt patches. -- desktop mailing list desktop@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/desktop
