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