30 Dec
2009
30 Dec
'09
10:58 a.m.
On Tue, Dec 29, 2009 at 8:19 PM, Jonathan E. Brickman
<jeb(a)joshuacorps.org> wrote:
Mark, I am curious: how low /can/ you set your latencies while
capturing 48 channels simultaneously to three hard drives??? And are
you using a firewire device, or something else?
J.E.B.
OK, so I don't change latency while actually recording. Changing
latency requires restarting Jack and the audio apps. Probably I should
have said I test Ardour recording 48 channels to 3 drives with
different latency settings in Jack.
I use 3 Firewire drives and tell Ardour that they are attached. Ardour
decides what audio data goes on each drive, but roughly speaking it
spreads out the audio data across all three. When I first did this a
few years ago I ran into trouble trying to do this on a single
internal IDE drive, even if it wasn't the main system drive. It might
work better today with newer drivers and SATA drives. Don't know.
Hope this clears things up.
- Mark
But for
now one question: How does one quantitatively measure that
one kernel is better than another? eg memory footprint, response time
etc?
For those of us doing real-time audio I measure it using Jack and
determining with each kernel how low I can set my latencies while
recording 48 channels of audio in one pass to three hard drives.
That's just me though.
Cheers,
Mark