[crossposts removed] On Mon, Apr 19, 2010 at 7:48 AM, Lennart Poettering <mznyfn at 0pointer.de> wrote: >> ? ? ? ? current latency: 444.25 ms >> ? ? ? ? requested latency: 31.25 ms > > So, this is interesting: the client requested 30ms (which is needlessly > low, but that's another question), I'm interested in that other question. What is a reasonable latency to request? In video games, especially ones streamed from remote servers (e.g. OnLive), latency is a huge issue; the network latency is unavoidable, so their client app is likely to be very keen to have minimal locally-caused latency. http://www.gamasutra.com/view/feature/3725/measuring_responsiveness_in_video_.php suggests that gamers will start noticing if the time from pressing a button to the time they hear a sound is above 70 to 100ms. Let's say the network latency to the game server is 20ms (can't ask for much lower), and that the streaming codecs have a latency of 10ms on each end (likewise). The time from a button push to hearing a sound would then be 20ms up + 10 ms encode + 20 ms down + 10 ms decode = 60ms. That leaves all of 10 to 40 ms for local audio latency. So, in what way is requesting 30ms unreasonable in that scenario? - Dan
