Valdis, thank you so much for that valuable answers!! There are some clusters running asterisk and they want RT kernels. I saw that there are RT kernels in the Centos repository so they may be easy to install, I guess that audio stuff need RT to avoid audio flickering, so I started to read about it. The technical stuff can be hard to grasp at first... thanks for helping me out! Cheers, 2018-05-28 21:48 GMT-03:00 <valdis.kletnieks@xxxxxx>: > On Mon, 28 May 2018 15:04:41 -0300, "Daniel." said: > >> Does the RT patches have been merged in the main line? or, They will >> be merged at all? > > Much of it has already been merged, the patchset used to be like 3-4 times the > size it is now. > >> The main benefit of RT kernel is that decreases the latency right? > > The point isn't to decrease the latency - realtime is about guaranteeing > a given process sufficient resources during each specified time interval. > Lowering the latency to open up more time is just one way to achieve that. > >> I read that it make all parts of the kernel preemptive, is this right? > > Well, that helps. If the CPU is currently busy in a non-preemptive chunk > of code in a filesystem for the next 25ms, and an RT task needs at least > 10ms of time during the next 20ms or a robot is going to crash into a wall > and halt an assembly line, you have a problem. > >> Why aren't these parts preemptive in the main line? >> What is the impact of making these parts preemptive? >> >> My general concept is that RT kernel has decreased latency, but >> increased overhead, ... is this right? > > And that's why most of the rest isn't merged. It does add overhead and > decreases total system throughput. And for 98% of the people who swear > up and down they need RT for their gaming/music/whatever, it turns out that > the current soft-RT code in the kernel is quite sufficient. > -- “If you're going to try, go all the way. Otherwise, don't even start. ..." Charles Bukowski _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
