[ecasound] Re: [Jackit-devel] large ecasound changes in progess

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Subject: [ecasound] Re: [Jackit-devel] large ecasound changes in progess
From: Jeremy Hall (jhall_AT_uu.net)
Date: Thu Feb 28 2002 - 23:04:32 EET

GRATZ! I'm sure it has been annoying, but it will be GREAT when all the
bugs are worked out. I didn't think we'd see this massive a change for


In the new year, Kai Vehmanen wrote:
> As a small preannouncement, I've spent the last few days (and nights
> unfortunately) reworking how ecasound's core classes interact. The
> ultimate goal is to make it possible for ecasound's engine to become part
> of a synchronous system like JACK. Most of this work relates to edi-22,
> "Engine iteration from outside sources".
> The good news is that all the big changes are now done. Considering how
> much code I've touched, suprisingly few things broke. ;) Communication
> with jackd is now more efficient, but there are still some cornercases
> where performance is not good enough.
> Some of the performance bottlenecks really seem strange. For instance with
> the current ecasound version I can stream a wav-file to jackd without
> xruns with a buffersize of 256 frames and jackd running with options
> "--asio -p 256 -n 2", and running _without_ root priviledges and
> sched_fifo scheduling. This is pretty awesome!
> But on the other hand, when ecasound and jackd are run as root with
> sched_fifo enabled, I always get a few 10-20msec latency spikes in the
> client side code. Because of this, operation with smaller buffersizes than
> 1024 does not work at all if run as root. And I don't seem to be able to
> pinpoint what actually goes wrong. I've placed rdtscll and gettimeofday()
> counters to almost every imaginable place in the code path and to no
> avail. Oh well, I can always start tracing kernel scheduling...;)
> There are still some big regressions in the current code, so I won't
> commit it to CVS just yet. The biggest ones are:
> - multitrack recording doesn't work; I'll need to rewrite
> the sync logic
> - prefilling rt-objects doesn't work; JACK doesn't need
> this but other rt-object types do
> --
> http://www.eca.cx
> Audio software for Linux!
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