On 01/08/2011 03:55 PM, Robin Gareus wrote:
On 01/08/2011 03:16 PM, Bernardo Barros wrote:
ondemand is no good because when it switches the processor actually
stops for a very short time. but this short drops are enough to cause
the terrible xruns on jack. stick to performance or conservative :-)
I'm tempted to call BS.
I can't find a reference or link but IIRC the "short time" a processor
stalls when changing frequency is these days in the usec range.
Anyway, discard all theory. It works empirically:
There are no problems here with JACK at 32*2 fpp @48kHz with the
ondemand govenour on both Intel Core Duo, Intel Core 2 Duo and Intel i5
CPUs (yes, that is going from nought to 16 jconvolvers causing CPU and
JACK load to jump).
anecdotal evidence: on my system(s), using ondemand is absolutely deadly
when using the ffado backend.
with the alsa backend, the system is mostly ok when running ondemand,
but then again i run fairly high latencies because jconvolver gets
really expensive when you shrink the period size...
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