<div dir="ltr">This stuff has all been written up with startling depth:<br><br> <a href="http://wiki.linuxaudio.org/wiki/system_configuration">http://wiki.linuxaudio.org/wiki/system_configuration</a><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Feb 14, 2016 at 12:07 PM, <a href="mailto:jonetsu@teksavvy.com">jonetsu@teksavvy.com</a> <span dir="ltr"><<a href="mailto:jonetsu@teksavvy.com" target="_blank">jonetsu@teksavvy.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Sat, 13 Feb 2016 16:01:57 -0500<br>
"<a href="mailto:jonetsu@teksavvy.com">jonetsu@teksavvy.com</a>" <<a href="mailto:jonetsu@teksavvy.com">jonetsu@teksavvy.com</a>> wrote:<br>
<br>
> It would be so nice to have no delay at all!<br>
<br>
Here is what was done so far. The test is with jackd -p 128 eg.:<br>
<br>
/usr/bin/jackd -T -ndefault -dalsa -dhw:M1010LT -r44100 -p128 -n2<br>
<br>
When playing an Ardour session, there is plenty of crackling noise<br>
still.<br>
<br>
kernel: 3.13.0-77-lowlatency<br>
<br>
/etc/default/rtirq is:<br>
#RTIRQ_NAME_LIST="rtc snd usb i8042"<br>
RTIRQ_NAME_LIST="snd_ice1712"<br>
<br>
% ./rtirq start<br>
Setting IRQ priorities: start [snd_ice1712] irq=18 pid=547 prio=90: OK.<br>
<br>
% cat /proc/irq/18/smp_affinity<br>
f<br>
<br>
% echo 2 > /proc/irq/18/smp_affinity<br>
<br>
% cat /proc/interrupts<br>
CPU0 CPU1 CPU2 CPU3<br>
0: 28 0 0 0 edge timer<br>
1: 3 0 0 0 edge i8042<br>
4: 0 0 0 2 edge<br>
8: 0 1 0 0 edge rtc0<br>
9: 0 3 0 0 fasteoi acpi<br>
12: 3 1 0 0 edge i8042<br>
18: 476281 151882 127790 60568 fasteoi snd_ice1712<br>
23: 117 12720 2133 42 fasteoi ehci_hcd:usb1,<br>
<br>
% ./rtirq status<br>
<br>
PID CLS RTPRIO NI PRI %CPU STAT COMMAND<br>
87 FF 90 - 130 0.0 S irq/8-rtc0<br>
547 FF 90 - 130 1.2 S irq/18-snd_ice1<br>
<br>
When playing an Ardour session, lots of these:<br>
<br>
JackEngine::XRun: client = mixbus was not finished, state = Running<br>
JackAudioDriver::ProcessGraphAsyncMaster: Process error<br>
<br>
<br>
<br>
<br>
<br>
<br>
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</blockquote></div><br></div>