Re: jack2 set to realtime / soft mode, normal kernel ?

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Hi!

Advantages of firewire approach:
1. Bus design. Internally, the firewire chip doesnt have to ask the CPU to copy data
to its port, it just does it, while USB devices use the CPU for this task.
2. On cheap laptops (and unfortunat others) the IRQ's between USB & something else
collide. This means worse performance. (I'm aware that Firewire IRQ's can collide too,
but I've never seen that phenomena before.)
3. Firewire daisy chaining does still exist, at least for the Echo Audiofire devices that I have.
4. I run a laptop (so PCI / PCI-E and a lot of other options are out. )
5. From my experiences, Firewire devices seem to be more geared towards professional use,
while USB targets the "pro-sumer" market. (No flame bait intended here..)

I like the Pure::Dyne, its always done well on my laptop. I've Dyne::Bolic before Pure::Dyne was
released, and I've been keeping a close eye on AV Linux too.. Between them I've kept my production
system installed (Pure Dyne), and a range of "testing" partitions with alternatives for Video / Blender work.

Installing Pure::Dyne is no problem, there's an GUI installer on the Desktop IIRC.
I'd run it live first, just to check it out to be honest. Not sure about RAID, never needed it.

Your question 2 has me confuzed I'm afraid, you're asking how its updated? The same
as any other system... a packet manager. Or do you mean how does the LiveCD get updated?
I think new ISO's are generated every once in a while...  not sure. Check out RemasterSys if your
hoping to update your Live system and keep it on a CD. (AV Linux is a debian based RemasterSys distro).

I'm not sure if Pure comes with development tools... It does come with PD, Processing, Arduino software
etc, but I dont think it has g++, gdb, svn or those installed. That said, its all a "sudo apt-get install <x>" away.

If you decide to try it, hope it goes well. Your mileage may vary ;-)
Cheers, -Harry


On Sat, Jul 10, 2010 at 8:20 PM, Jonathan E. Brickman <jeb@xxxxxxxxxxxxxxx> wrote:
Harry, rather good guess :-)  Not Firewire.  AudioTrak Prodigy HD2, PCI.
It has been extremely well-behaved.

In your opinion, what is the advantage of the Firewire approach?
Cabling?  Replaceability?  Ease of multitrack functionality?  The
Firewire daisychain capability (does it still exist)?

I just checked out the Pure::Dyne web site.  Very promising and
up-to-date, not like I last saw it a while back.  Questions:

1.  Does it install onto hard drive reasonably easily?  I noticed that
that page in the wiki isn't there yet, just a title/placeholder.  Can it
do RAID-1 without terrible pain?

2.  If it's designed explicitly for DVD/USB use (and it looks like it
is), is that how it's updated?  In other words, can I expect to just
update my system device and it will use an existing older-version
profile reliably?  This would be a very good way to keep a production
machine.

3.  Does it include thorough current compilation capabilities?

J.E.B.

On Sat, 2010-07-10 at 18:35 +0100, Harry Van Haaren wrote:
> Hey Johnathan,
>
> Mind expanding a bit on what soundcard your using, kernel version,
> jack frames & period?
>
> If im to guess, you're not on a firewire card, usually the -RT is
> really nessiary to ensure
> no XRuns..
>
> Maybe you are though.. that's when I'd be really intrested! -Harry
>
> PS: I'm not on Fedora at the moment, running Pure::Dyne latest stable.
> Very good -RT performance
> on this laptop with that kernel & firewire stack. :-)
>
> On Sat, Jul 10, 2010 at 6:28 PM, Jonathan E. Brickman
> <jeb@xxxxxxxxxxxxxxx> wrote:
>         I was very surprised to see Jack2 working well set to realtime
>         + soft mode, with a normal (non-rt) kernel, giving me 2.67 ms
>         stated latency without kernel crashes in Fedora 13.
>


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