On Tue, Jun 01, 2010 at 12:18:57AM +0200, Robin Gareus wrote: > On 05/31/2010 10:42 PM, fons@xxxxxxxxxxxxxxx wrote: > > > If an audio subsystem is using 320MB of memory it's broken. Just dump it. > > > I think you followed Lennart's presentation @LAC2010 [1] explaining the > motivation for this: Pulseaudio keeps buffers sometimes 10 secs long or > even more. The reason for that is to have the CPU wake up as little as > possible in order to save power. This is a bogus argument. Keeping software buffers does not help to reduce the number of times the CPU has to wake up - this depends *only* on how much the audio *hardware* is able to buffer. For this reason chips designed for portable use have something like 2 seconds of internal buffering. 320 MB corresponds to more than ** 13 minutes ** of stereo signal in floating point format at 48 kHz. > FWIW jackd also locks ~80MB in /dev/shm here. The computer I'm writing this on has just 512 MB. ATM it's playing back 32 channels in Ardour, and processing them with jconvolver. I still have 300 MB free. Ciao, -- FA O tu, che porte, correndo si ? E guerra e morte ! _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
