8 Oct
2011
8 Oct
'11
4:46 a.m.
On Fri, Oct 7, 2011 at 6:25 PM, Michael Ost <most(a)museresearch.com> wrote:
We are seeing unexpected interruptions of SCHED_RR
audio processing threads,
and are struggling to understand why they are happening. Does anyone have
any good tips or tools to suggest to help figure out what is preempting or
delaying realtime audio threads?
The issues are coming up with Receptor [see (*) below for an intro] running
its 2.6.24.3 CCRMA based kernel. The bug appears with Receptor in its "dual
core mode", with three instances of Native Instruments' Kontakt 4 in DFD +
multi-core mode. Either lots of held notes, or large patches are needed to
get the spikes.
<bitching>
You know, even if I could help you, I'm not interested in doing so. I
bought a Receptor Pro Jr. just before the Receptor 2s came out. At
the time I asked Jack Ortolani (if I recall the name correctly) if the
upcoming Receptor 2 OS would be made available for Receptor Version C
hardware, like the Receptor Pro Jr., and he told me that it definitely
would, and that it wouldn't cost me anything. It seemed totally
plausible, as a Receptor is *basically* just a souped-up PC, and the
OS is just a customized version of Fedora Linux. Based on that data,
I bought the Pro Jr. (approximately 2,000 USD), only to find out that
Muse Research decided instead to create an upgrade path for people
with Revision C hardware, with an upgrade costing almost as much as
the Receptor I had just bought:
http://www.museresearch.com/products/receptor2-upgrades.php
Several users, including myself, tried to get Muse to address the problem:
http://www.kvraudio.com/forum/viewtopic.php?t=267189
http://www.kvraudio.com/forum/viewtopic.php?t=260705
Your company insisted that the reason the OS wasn't being made freely
available is because the OS would require a SATA hard drive, and that
the SATA drive would be rendered unbootable after a certain number of
boots due a BIOS issue in the Version C hardware:
http://www.kvraudio.com/forum/viewtopic.php?p=3827915#3827915
http://www.kvraudio.com/forum/viewtopic.php?p=3927549#3927549
... which was eventually debunked by users:
http://www.kvraudio.com/forum/viewtopic.php?t=288470
http://www.kvraudio.com/forum/viewtopic.php?p=4596361#4596361
Even then, some of us wanted to have the new operating system, and
would have been happy running it off of the IDE drives that came with
our Receptors. Muse Research confirmed this wasn't a problem:
http://www.kvraudio.com/forum/viewtopic.php?p=3936241#3936241
... but failed to actually say why they wouldn't allow us to upgrade
in that fashion.
I later wrote your CEO and asked for a refund on my hardware, and he
completely ignored me.
I despise your company and its business practices.
</bitching>
--
Devin Anderson
devin (at) charityfinders (dot) com
CharityFinders - http://www.charityfinders.com/
synthclone - http://synthclone.googlecode.com/