[pulseaudio-discuss] [PATCH] Change the default fragment size to 5 ms

[Alexander E. Patrakov]

24.10.2014 12:06, David Henningsson wrote:
> On Ubuntu, since before my time, this has been the default:
>
> default-fragments = 8
> default-fragment-size-msec = 10
>
> ...so 8 x 10 = 80 ms. If you end up with 5 x 4 = 20 ms, I think that's a
> bit too short/sensitive, we should then increase the number of periods
> to 16 or at least 8 in the same go, so you'll end up with something
> above 50 ms in total. I think this could help against underruns caused
> by inoptimal scheduling.

Unfortunately, what seems to matter (contrary to my initial mail) is the 
total buffer size, which needs to be less than 34 ms. I don't know where 
this magic number comes from.

4 fragments 5 ms each = works
4 fragments 8 ms each = works
4 fragments 9 ms each = does not work
2 fragments 16 ms each = works
3 fragments 16 ms each = does not work
3 fragments 11 ms each = works
3 fragments 12 ms each = does not work
2 fragments 17 ms each = does not work
6 fragments 5 ms each = works
7 fragments 5 ms each = does not work

-- 
Alexander E. Patrakov