Did some more research. /etc/mpd.conf now reads
audio_output {
type "alsa"
format 44100:16:2
name "audio out"
period_time 50000
auto_resample "no"
use_mmap "yes"
device "hw:0,0"
}
i.e. lock sample rate at native value bypass dmix according to
http://mpd.wikia.com/wiki/Tuning
This has gotten the CPU usage down to around 20%, and made it less
spiky. I've been able to drop audio_buffer_size to 4192 and
max_output_buffer_size back to the default.
Might try OSS as a regrettable workaround.
--
CPU usage spikes to 30% regularly during playback, no PulseAudio involved, just
ALSA
https://bugs.launchpad.net/bugs/368121
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