On Nov 28, 2013 3:09 AM, "Ralf Mardorf" <[email protected]> wrote: > > > > On Wed, 2013-11-27 at 19:53 -0500, Mike Holstein wrote: > > On Wed, Nov 27, 2013 at 2:57 PM, Alex Armani > > <[email protected]> wrote: > > What are the advantages and disadantages of using the low > > latency kernel? How is this different from the real time > > kernel? I use the Gnome 3.8 desquetop 64 bit studio. > > > > the realtime kernel is basically discontinued. you can add it via ppa, > > or build it yourself. if you need the realtime kernel, you'll know, > > and seek it out. what are its advantages? lowlatency. disadvantages? > > the things that are compromised to provide lowlatency and audio > > priority can (and will) change performance of other things, such as > > power management. to address these differences between a normal, well > > supported, standard generic kernel, and the realtime kernel, a > > compromise was introduced. the lowlatency kernel is supposed to > > address these concerns, and provide an appropriate kernel that can do > > realtime at lower latency settings without the compromise in > > performance in other areas. if you are considering a realtime kernel > > via PPA, keep in mind those sources are not officially supported. > > there is no reason to remove any kernels. you can always keep the > > lowlatency and the generic, as well as a realtime kernel from a ppa > > installed, and choose between them at boot time from the grub menu. > > its likely you dont need lowlatency at all. if you are doing realtime > > effects or software synths as an instrument, you will want lower > > latency, but really anything around or under 8ms is plenty. enjoy! > > There are different levels of real-time for Linux and non of the levels > does provide hard real-time, but nowadays it's that close to good old > hard real-time, that it doesn't matter. > > Latency shouldn't be an issue, nowadays many amateur engineers expect > lower latencies for virtual stuff, then real musical instruments do > provide. Important is, that there is no jitter. > > If you do MIDI work with external MIDI gear, than the lowlatency kernel > is not a very good choice. To get rid of MIDI jitter, you need the > hardest real-time the rt-patch does provide and very good hardware. > > Preemption Model > 1. No Forced Preemption (Server) (PREEMPT_NONE) > 2. Voluntary Kernel Preemption (Desktop) (PREEMPT_VOLUNTARY) > 3. Preemptible Kernel (Low-Latency Desktop) (PREEMPT__LL) > 4. Preemptible Kernel (Basic RT) (PREEMPT_RTB) > 5. Fully Preemptible Kernel (RT) (PREEMPT_RT_FULL) > > Regards, > Ralf > > PS: > > Real-time at the moment IMO is a serious issue >
It's a non-issue. There are 2 types of kernels in the default repos. The lowlatency one is the most appropriate for lowlatency needs. If a different one is determined more appropriate, one is welcome to seek out one from unsupported sources. Cheers! > http://lists.linuxaudio.org/pipermail/linux-audio-user/2013-November/095098.html > https://lists.ubuntu.com/archives/kubuntu-users/2013-November/058744.html > > This one has got follow ups: > http://archaudio.org/pipermail/archaudio-discuss/2013-November/000307.html > > > -- > ubuntu-studio-users mailing list > [email protected] > Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-studio-users
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