I'm having good results from using a much leaner install - it's called Mobius:
http://moebiuslinux.sourceforge.net/

Obviously depends on your usage but I'm ssh'ing into the pi and works great.  The minimal install seems to help with overclocking too so I reckon I'm getting about another 35-40% out of the pi.

The main project I've been working on has a pmpd patch that the regular raspbian wouldn't even run, on top of that I'm driving a couple of sensors (thanks Martin:), audio synthesis, got a reasonably complex quad spacialisation patch (thanks Lorenzo:) and is driving a 6 channel soundcard.  This is without the usb-slowdown option.

Obviously it's pushing the Pi right up to the limit but it runs just about stably.

What I do think made a significant difference was switching the power cable to one that outputs 5.2v so by the time it gets to the pi it's a solid 5v.

Julian


On 3 July 2013 09:42, Dan Wilcox <danomatika@gmail.com> wrote:
Yeah I tried that out a few months ago when we started the thread. Jack adds some unnecessary overhead in my opinion and I'm surprised that a device that should be more than capable to handle this is just not setup correctly. I'm running a minimal commandline install and pd + realtime & straight alsa should work great ... it has for me in the past.

His jack setup basically uses *all* the cpu of the pi, so that cuts out the other parts of my setup altogether .. visual, device input, etc. Again, I was able to get good latency with a much lower resource machine (until it just wore out), so it *should* be possible.
On Jul 3, 2013, at 4:35 AM, Julian Brooks <jbeezez@gmail.com> wrote:

Hey Dan,

Jeremy (autostatic), who setup the 'rpi and low latency, real time audio' thread has a UA-25 and seems to have full duplex working with jack (this was before the recent tweaks as well):
http://www.raspberrypi.org/phpBB3/viewtopic.php?p=286222&sid=85c8b0a7cca69e35dcafaf58ff916eec#p286222

Could be worth asking him?

Julian


On 3 July 2013 02:58, Dan Wilcox <danomatika@gmail.com> wrote:
Yeah I tried the latest firmware with my Raspbian install and still have issues with my UA-25. Full stereo duplex = dropouts. :(

On Jul 2, 2013, at 5:52 PM, pd-list-request@iem.at wrote:

From: Pierre Massat <pimassat@gmail.com>
Subject: Re: [PD] Raspberry Pi USB2 audio fixed (apparently)
Date: July 2, 2013 3:52:31 PM EDT
To: Julian Brooks <jbeezez@gmail.com>
Cc: PD List <pd-list@iem.at>


Hi all,

I did a fresh install of Raspbian using the NOOBS installer. The pd-extended package from puredata.info doesn't work with my soundcard (it wasn't working before). And Pd vanilla installed from the Raspbian repositories doesn't work with it either (although it was working fine before). My soundcard is an old EMU 0404 USB. By "doesn't work" I mean that it either throws an "Audio stuck/closing audio" error, or simply freezes everything (Pd, LXDE, mouse, everything) and all I can do is unplug the power chord.

So for me not only did it not fix anything, but i'm actually worse off and left with the inability to use Pd at all on my Pi. 

I haven't tried Miller's compiled version of Vanilla yet (I still don't know how it is different from the one available in the Raspbian repos). The recent Planet CCRMA Satelite for the RPi is also an option.

Pierre.

--------
Dan Wilcox
@danomatika






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Dan Wilcox
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