For starters, these are my cards
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$ cat /proc/asound/cards
0 [Generic ]: HDA-Intel - HD-Audio Generic
HD-Audio Generic at 0xfcda0000 irq 98
1 [Generic_1 ]: HDA-Intel - HD-Audio Generic
HD-Audio Generic at 0xfcc00000 irq 100
Are sound card IRQs shared with anything else? NO
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$ cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7 CPU8 CPU9 CPU10 CPU11
98: 0 0 0 0 0 0 1245 0 0 0 0 0 IR-PCI-MSI 5769216-edge snd_hda_intel:card0
100: 0 0 0 0 0 0 0 752054 0 0 0 0 IR-PCI-MSI 6823936-edge snd_hda_intel:card1
Is the cpu scaling governor set to performance? YES
I run
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# cpupower frequency-set -g performance
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$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
performance
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$ uname -srv
Linux 5.4.26-rt17-1-rt #1 SMP PREEMPT_RT Tue, 24 Mar 2020 12:03:28 +0000
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$ jackd -R -P90 -dalsa -dhw:Generic_1 -r48000
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$ chrt -p 28422
pid 28422's current scheduling policy: SCHED_FIFO
pid 28422's current scheduling priority: 90
I am unsure whether this is an issue, and I'm starting to believe it may very well be.
(Here I tried to embed an image but it doesn't seem to be working, link is left here https://imgur.com/a/mBs7rXc)
Under absolutely no load (no audio applications connected to JACK and DSP load at ~0.02%) I'm getting xruns at a rate of 15 per second. I've tried lowering the buffer size and the problem only gets worse, and I will not allow anything above -p128, maybe even -p256. However, in this test, even at the standard period size of 1024 it's getting a ton of xruns.
I have absolutely no clue what could be going on. I am glad to add any more information if needed, and am very thankful for any help I may get.