Re: [LAU] jack2 vs. jack1/zita vs. jack2+zita-a2j, performance differences

From: Paul Davis <paul@email-addr-hidden>
Date: Thu Apr 17 2014 - 10:43:12 EEST

On Thu, Apr 17, 2014 at 3:11 AM, michael noble <looplog@email-addr-hidden> wrote:

>
> On Thu, Apr 17, 2014 at 3:37 PM, Paul Davis <paul@email-addr-hiddenwrote:
>
>> I really don't understand the goal here.
>
>
> I'm guessing the goal is to see if better performance in driving
> softsynths can be obtained by using zita-j2a to handle output rather than
> using jack directly interfacing with Alsa. I don't think it was intended to
> be a jack1/jack2 match off. To me it seems like an interesting experiment,
> and I hope Jonathan keeps up the tests, despite the so far only negative
> feedback.
>
> One of the fun things about being an ignorant user is to sometimes try
> stuff out just for the heck of it and find things even the original creator
> of something didn't intend. If people only followed rules, entire genres of
> music wouldn't likely exist, so I say bring on the experimentation.
>

absolutely agreed.

>
> Which is not to say the tests can't be improved. Apart from criticisms
> already raised, from my limited knowledge it seems to essentially be
> comparing full-duplex performance of the jack alsa backend with single
> duplex performance of zita-j2a, which hardly seems fair. Another question I
> have is to whether zita is adding latency in addition to that reported by
> jack, which the tests don't seem to indicate.
>

the zita internal client in jack1 can be configured to any latency
settings, but the default (and optimal) setting matches those of the
server. so in those tests using -A SB, the bridge follows the server
configuration and adds no latency.

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Received on Thu Apr 17 12:15:02 2014

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