However:
Sound card is eating about 5% of one CPU core:
Line from top:
93 root -51 0 0 0 0 S 4,6 0,0 2:44.19
irq/16-
Fragment of /proc/interrupts
Is it normal for USB sound devices to generate such load?
CPU0 CPU1 CPU2 CPU3
0: 193 632 11469 650551 IO-APIC-edge timer
1: 0 0 1 1 IO-APIC-edge i8042
7: 1 0 0 0 IO-APIC-edge
8: 0 0 0 0 IO-APIC-edge rtc0
9: 0 0 0 0 IO-APIC-fasteoi acpi
12: 1 0 0 4 IO-APIC-edge i8042
14: 0 1 49 4226 IO-APIC-edge pata_amd
15: 0 0 0 0 IO-APIC-edge pata_amd
16: 4326115 10821 8863 214 IO-APIC-fasteoi ,
# btw, what comma does here instead of name?
17: 0 0 0 0 IO-APIC-fasteoi eth0
The IRQ16 stops using CPU if USB sound card is disconnected. The card is
connected to USB 3.0 PCI card identified as USB controller: Renesas
Technology Corp. uPD720202 USB 3.0 Host Controller.
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https://bugs.launchpad.net/bugs/1319457
Title:
usb headset causes "retire_playback_urb ... callbacks suppressed" spam
in dmesg
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