Tom Gundersen <teg@xxxxxxx> writes: > On Sun, Nov 13, 2011 at 10:00 PM, XeCycle <xecycle@xxxxxxxxx> wrote: >> Hi, I'm using the latest kernel from [core] (linux 3.1-4), and >> experienced a terrible delay of software MIDI synthesizers. >> >> I'm using fluidsynth, using ALSA as the output driver (I simply can't >> get jack working), and VMPK as a keyboard MIDI event generator. The >> delay used to be fine, but with the latest kernel, it's longer than 0.5 >> secs --- that's unusable. I believe this should be kernel-related, >> could you please suggest some solutions or workarounds? > > Some more data would be needed. I suggest trying out latencytop. I'll have a look. > And also checking if > > for dev in /proc/asound/card*/pcm*/sub*/prealloc; do > echo 64 > $dev > done > > solves the problem. Thanks, this solves it. Curious about what is this? > I think the first step should be to figure out why Jack does not work, > that's supposed to deal with low-latency situations, so using ALSA > directly might not have been tested very much for this use. I believed I did every step in the guide (on the arch wiki), also no programs showed any error --- but they can't produce any sound. -- Carl Lei (XeCycle) Department of Physics, Shanghai Jiao Tong University OpenPGP public key: 7795E591 Fingerprint: 1FB6 7F1F D45D F681 C845 27F7 8D71 8EC4 7795 E591
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