[Voyage-linux] Voyage 0.10+Net5501 -> IRQ issue?

[Muffinman]

Hello again,

I've done some experimenting with the issue and I think I have narrowed
the problem down a bit. The issue is partially introduced in Voyage
0.9.2 with the introduction of libata (see /proc/interrupts below). In
0.9.1. hires files play smoothly.

In solving this problem: I suppose there are two possible scenario's:
either fix the problem with libata or reverse to the legacy PATA
drivers. Where do I go to fix libata (code or configuration)? Else, how
do I reverse to the legacy drivers?

I hope anyone has some suggestions on either strategy.

Thanks in advance, Maarten

0.9.1
cat /proc/interrupts
           CPU0      
  0:     290271    XT-PIC-XT-PIC    timer
  1:          0    XT-PIC-XT-PIC    i8042
  2:          0    XT-PIC-XT-PIC    cascade
  4:        556    XT-PIC-XT-PIC    serial
 11:       1828    XT-PIC-XT-PIC    eth0
 14:       6367    XT-PIC-XT-PIC    ide0
 15:         38    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
RTR:          0   APIC ICR read retries
RES:          0   Rescheduling interrupts
CAL:          0   Function call interrupts
TLB:          0   TLB shootdowns
ERR:          0
MIS:          0

0.9.2
cat /proc/interrupts
           CPU0      
  0:   16021039    XT-PIC-XT-PIC    timer
  1:          0    XT-PIC-XT-PIC    i8042
  2:          0    XT-PIC-XT-PIC    cascade
  4:        549    XT-PIC-XT-PIC    serial
  7:          3    XT-PIC-XT-PIC 
 11:      74406    XT-PIC-XT-PIC    eth0
 14:      74362    XT-PIC-XT-PIC    pata_amd
 15:    9406334    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:          3
MIS:          0


On 17/12/15 21:29, Muffinman wrote:
> Hello all,
>
> I've been running Voyage 0.10.0 for a while but unfortunately it doesn't
> run very smooth compared to 0.7.5. It's running on a Soekris net5501.
> With normal 44.1 files its running fine but with higher resolutions it
> stutters/distorts every few seconds or so, quite annoying.
>
> I've loaded 0.7.5 on the CF card of the 5501 and the main differences
> are in the load IRQ processes are creating.
>
> 5501: The following processes are producing a combined 15-20% cpu load
> depending on the resolution currently being played. In 0.7.5. these
> processes are not visible, so I'm not sure what that means.
> irq/15-ehci_hcd
> irq/15-ohci_
> irq/15-pata_amd_hcd
>
> However:
> - ksoftirq is also slightly elevated at 1.6 when running 0.10.0 compared
> to 0 on the 0.7.5.
> - The si line in 'top' seems also to be quite high (between 2 and 7)
> compared to when running 0.7.5 (between 0 and and occasional 0.3).
> - system load is also quite high
>
> It seems to me I have an irq problem, and the output of cat
> /proc/interrupts (see below) seems to give some confirmation. The pata
> and the usb irq's are shared in 0.10.0. This makes sense since the music
> files are locally stored and accessed through a pata interface.
>
> Anyone any ideas on how to fix this? Does anyone know what has changed
> between 0.7.5 and 0.10 that might have caused this change?
>
> Kind regards and thanks in advance, Maarten
>
> 0.7.5: 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
>
> 0.10.0: 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
>
>