This really helped to zero down my thinking between real time and performance.
As I did not use this G1 phone, I am not sure of Android phones reliability. May be once who used G1 phone/tested G1 phones can answer these questions better, - How reliable are Android phones? - Does it really need attention to make Android phone reliable? i.e., real time? - Does android users really face reliability kind of issues in the existing phones in market, if yes then up to what extinct like 1/10 or 1/1000? Thanks, Vamsi On Fri, Oct 16, 2009 at 1:53 AM, Bateman <7thharmo...@gmail.com> wrote: > > Real Time is NOT about making things "quicker". Its about reliability. > Its about providing guarantees that certain events will happen within > a particular time deadline no matter how the rest of the system is > behaving. For example, lets say there is a music application > playing..which in itself is a soft real time application as a certain > "frame" needs to be played within a particular time deadline. Now say > there is another application that runs a computationally intensive > task..or for that matter a while(1) loop!. Now this while(1) could > screw the music app. But with real-time support in place you can > provide "reservations" to the music app which will guarantee the music > to be played, in spite of some other application misbehaving. > > The real-time patch in linux does provide cpu reservation budgets but > does not provide hard guarantees what so ever. > > The g1 phone processor is definitely slower than new iphones. Hence by > providing rt-extensions one will not be able to the responses of the > applications quicker than iphone! > > On Oct 15, 1:10 pm, Dianne Hackborn <hack...@android.com> wrote: > > On Wed, Oct 14, 2009 at 10:17 PM, vamsi android <vamsi.andr...@gmail.com > >wrote: > > > > > Running the rt kernels will just slow down your android system, which > is > > > > > not what I think you want it to do. > > > > > *--> Regarding Android system performance, at present when we > compare > > > iphone performance > > > and G1 performance we can clearly see the difference. So, > what I > > > was thinking was to make > > > android performance better and comatialble to iphone. The > speed > > > with which applications are loaded, > > > and accessed are not matching with iphone!! > > > * > > > > Comparing what vs. what? Are you comparing them on the same hardware? > If > > not, this "observation" is useless, and I certainly I can't see how it > > brings you to jump to "oh we need a real time scheduler." (Though that > > said, there is another non-realtime alternative scheduler that apparently > > may provide noticeable improvement over the stock one.) > > > > -- > > Dianne Hackborn > > Android framework engineer > > hack...@android.com > > > > Note: please don't send private questions to me, as I don't have time to > > provide private support, and so won't reply to such e-mails. All such > > questions should be posted on public forums, where I and others can see > and > > answer them. > > > > --~--~---------~--~----~------------~-------~--~----~ unsubscribe: android-kernel+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-kernel -~----------~----~----~----~------~----~------~--~---
