Hello,
I recently upgraded my net5501 running Voyage Linux MPD. This new
version replace legacy PATA drivers with libata a.o. Since then, sound
played through a usb-dac is frequently distorted with cracks and
stutters, especially with high resolution files. The files are stored on
a sata drive.
It seems the problem lies in the pata drive sharing an irq with usb, irq15.
Is my observation correct this is my problem? Does anyone know how to
fix this or where to go to find a solution?
Kind regards, Maarten
p.s. here are a few observations:
The following processes are producing a combined 15-20% cpu load
depending on the resolution currently being played. Without libata these
processes are not visible.
irq/15-ehci_hcd
irq/15-ohci_
irq/15-pata_amd_hcd
- ksoftirq is also slightly elevated at 1.6 when running with libata
compared to 0 on the without.
- The si line in 'top' seems also to be quite high (between 2 and 7)
compared to when running without libata (between 0 and and occasional 0.3).
- system load is also quite high
Without libata: cat /proc/interrupts
CPU0
0: 2610959 XT-PIC-XT-PIC timer
1: 0 XT-PIC-XT-PIC i8042
2: 0 XT-PIC-XT-PIC cascade
3: 1 XT-PIC-XT-PIC
4: 273 XT-PIC-XT-PIC serial
7: 1 XT-PIC-XT-PIC
11: 41747 XT-PIC-XT-PIC eth0
14: 188673 XT-PIC-XT-PIC ide0
15: 3926610 XT-PIC-XT-PIC ehci_hcd:usb1, ohci_hcd:usb2
NMI: 0 Non-maskable interrupts
LOC: 0 Local timer interrupts
SPU: 0 Spurious interrupts
PMI: 0 Performance monitoring interrupts
IWI: 0 IRQ work interrupts
RES: 0 Rescheduling interrupts
CAL: 0 Function call interrupts
TLB: 0 TLB shootdowns
ERR: 1
MIS: 0
Libata: cat /proc/interrupts
CPU0
0: 302642 XT-PIC-XT-PIC timer
1: 0 XT-PIC-XT-PIC i8042
2: 0 XT-PIC-XT-PIC cascade
4: 515 XT-PIC-XT-PIC serial
8: 1 XT-PIC-XT-PIC rtc0
11: 2473 XT-PIC-XT-PIC eth0
14: 11585 XT-PIC-XT-PIC pata_amd
15: 38 XT-PIC-XT-PIC pata_amd, ehci_hcd:usb1, ohci_hcd:usb2
NMI: 0 Non-maskable interrupts
LOC: 0 Local timer interrupts
SPU: 0 Spurious interrupts
PMI: 0 Performance monitoring interrupts
IWI: 0 IRQ work interrupts
RTR: 0 APIC ICR read retries
RES: 0 Rescheduling interrupts
CAL: 0 Function call interrupts
TLB: 0 TLB shootdowns
ERR: 0
MIS: 0
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