[LAU] Small instrument hardware module

Harry van Haaren harryhaaren at gmail.com
Tue Oct 21 10:27:49 UTC 2014


Hey all,

I have a HDA ( cat /proc/interrupts tells me so anyway: snd_hda_intel ).
Its my built-in laptop soundcard, and it works pretty well, down to about
44.1kHz, -p128 -n3. That's ~8ms, which is acceptable IMO.

I've read on mailing list / internet somewhere* that spec for the HDA is
pretty open-to-interpretation, so I think the exact hardware / chipset
would need to be tested to get true results.

-Harry

*and lost the link..

On Tue, Oct 21, 2014 at 11:14 AM, Patrick Shirkey <
pshirkey at boosthardware.com> wrote:

>
> On Tue, October 21, 2014 8:41 pm, Carlos sanchiavedraz wrote:
> > 2014-10-21 11:37 GMT+02:00 Patrick Shirkey <pshirkey at boosthardware.com>:
> >
> >>
> >> On Tue, October 21, 2014 8:27 pm, Carlos sanchiavedraz wrote:
> >> > 2014-10-20 17:10 GMT+02:00 Patrick Shirkey
> >> <pshirkey at boosthardware.com>:
> >> >
> >> >>
> >> >> On Mon, October 20, 2014 10:59 pm, Jeremy Jongepier wrote:
> >> >> > On 10/20/2014 11:34 AM, Atte wrote:
> >> >> >> Dunno about jack, but it seems interesting! However I can't seem
> >> to
> >> >> find
> >> >> >> any prices...
> >> >> >
> >> >> > These devices are fairly cheap starting from about $50:
> >> >> >
> >> >>
> >>
> http://www.dx.com/p/ditter-u20-dual-core-android-4-2-google-tv-hd-player-w-1gb-ram-4gb-rom-hdmi-black-300969#.VET43IXSWAs
> >> >> >
> >> >>
> >> >> If you want something that is relatively cheap that can run pianoteq,
> >> >> linuxsampler, etc... then you should look into the Intel NUC range.
> >> >>
> >> >> They provide a very nice piece of gear for a stand alone solution and
> >> >> decent responsive support via the OTC forums. I requested a change to
> >> >> the
> >> >> BIOS and they did it for me as an update.
> >> >>
> >> >> I have had one for several months as a head for my home entertainment
> >> >> center and it is working very well. Yesterday I did some edits with
> >> >> ardour2. All I had to do was "apt-get install ardour".
> >> >>
> >> >> It's not $50 but it is less than $300 for a complete 64 bit x86
> >> solution
> >> >> including RAM/HDD/SSD. The case is brushed aluminium and it is very
> >> >> robust. If you get an SSD it is nearly 100% solid state apart from
> >> the
> >> >> CPU
> >> >> fan which is almost noiseless.
> >> >>
> >> >> My (cheap) home stereo speaker system generates more noise than the
> >> fan
> >> >> and I have it running 24/7 for net streaming to TV with full 1080p
> >> over
> >> >> hdmi.
> >> >>
> >> >> Saves all the hassle of learning how to cross compile and the general
> >> >> issues associated with developing for ARM.
> >> >>
> >> >> I tried several other options before settling on this one. They were
> >> >> cheaper but also more frustrating.
> >> >>
> >> >> Intel are catching up on ARM these days with the 16/14/12nm fab
> >> process.
> >> >>
> >> >> > That's one of the cheapest I could find with an Allwinner A20
> >> chipset.
> >> >> > Better would be to get something like a Cubieboard.
> >> >> >
> >> >>
> >> >> --
> >> >> Patrick Shirkey
> >> >> Boost Hardware Ltd
> >> >> _______________________________________________
> >> >> Linux-audio-user mailing list
> >> >> Linux-audio-user at lists.linuxaudio.org
> >> >> http://lists.linuxaudio.org/listinfo/linux-audio-user
> >> >>
> >> >
> >> > That about Intel NUC range sounds really interesting. Which device do
> >> you
> >> > have, Patrick? I guess the possibilities are one of these:
> >> > http://techpartner.intel.com/campaigns/nuc/
> >> >
> >>
> >> I got the cheapest one at the time which was the DNY2820FKH. It has a
> >> dual
> >> core celeron and 4GB RAM. I think it can take up to 16GB.
> >>
> >> > Apart from running Ardour, what about RT and IRQs and that stuff?
> >> > Thanks Patrick.
> >> >
> >>
> >> The rt config is in place but I haven't really pushed it for audio
> >> generation yet. It runs electricsheep and full 1080p video/audio without
> >> any issues. I can get about 30fps with 1080p which is decent for viewing
> >> but not fast enough for competitive playing.
> >>
> >> Here is cat /proc/interrupts
> >>            CPU0       CPU1
> >>   0:         26          0   IO-APIC-edge      timer
> >>   1:          2          0   IO-APIC-edge      i8042
> >>   8:          1          0   IO-APIC-fasteoi   rtc0
> >>   9:          0          0   IO-APIC-fasteoi   acpi
> >>  10:   10801372          0   IO-APIC-edge      ite-cir
> >>  12:          4          0   IO-APIC-edge      i8042
> >> 103:    1018511          0   PCI-MSI-edge      xhci_hcd
> >> 104:    7418719          0   PCI-MSI-edge      ahci
> >> 105:  113014233          0   PCI-MSI-edge      eth0
> >> 106:  216595760          0   PCI-MSI-edge      i915
> >> 107:        373    1604714   PCI-MSI-edge      iwlwifi
> >> 108:    1368299          0   PCI-MSI-edge      snd_hda_intel
> >> NMI:      48085      47493   Non-maskable interrupts
> >> LOC:  383351941  317871495   Local timer interrupts
> >> SPU:          0          0   Spurious interrupts
> >> PMI:      48085      47493   Performance monitoring interrupts
> >> IWI:    4051038    6083943   IRQ work interrupts
> >> RTR:          0          0   APIC ICR read retries
> >> RES:   69587463   71022804   Rescheduling interrupts
> >> CAL:        427        487   Function call interrupts
> >> TLB:    1192097    1158476   TLB shootdowns
> >> TRM:          0          0   Thermal event interrupts
> >> THR:          0          0   Threshold APIC interrupts
> >> MCE:          0          0   Machine check exceptions
> >> MCP:       2904       2904   Machine check polls
> >> ERR:          0
> >> MIS:          0
> >>
> >>
> >>
> >>
> >>
> >>
> >> --
> >> Patrick Shirkey
> >> Boost Hardware Ltd
> >> _______________________________________________
> >> Linux-audio-user mailing list
> >> Linux-audio-user at lists.linuxaudio.org
> >> http://lists.linuxaudio.org/listinfo/linux-audio-user
> >>
> >
> > Thanks!
> >
> > It'll be great if it runs Debian/Musix and if it could be configured for
> > RT
> > audio.
> >
>
> I have installed Debian but there were issues with the wifi chipset so I
> switched to ubuntu which has better support for wifi ootb. Simply because
> I didn't want to spend any more time on wifi issues at that point having
> just ditched a rockchip device with similar problems. Now I don't use wifi
> so I could switch back to debian but seeing as everything is already setup
> there is not much motivation.
>
> The realtime config is in place when I installed jack/ardour2. I have not
> tested the actual best case  latency with jack yet. It works fine with -p
> 1024 -r48000 -n2.  Maybe someone else has latency details on the audio
> chipset with other systems? (snd-hda-intel)
>
> I'll try to run some tests when my daughter is not watching teletubbies.
>
>
> --
> Patrick Shirkey
> Boost Hardware Ltd
> _______________________________________________
> Linux-audio-user mailing list
> Linux-audio-user at lists.linuxaudio.org
> http://lists.linuxaudio.org/listinfo/linux-audio-user
>



-- 

http://www.openavproductions.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.linuxaudio.org/pipermail/linux-audio-user/attachments/20141021/3d16d5bb/attachment.html>


More information about the Linux-audio-user mailing list