[linux-audio-dev] Re: desktop and multimedia as an afterthought?

[Andrew Morton]

Thomas Charbonnel <thomas at undata.org> wrote:
>
> On my system xruns seem related to the keyboard. I get xruns on ~8.079
>  seconds boundaries when the keyboard is in use, regardless of the load.
>  My usual test is running jack with 2 periods of 64 samples and no
>  client, and keep a key pressed. Those latencytest graphs give an idea of
>  the problem : http://www.undata.org/~thomas/latencytest/index.html
> 
>  Here are the xrun_debug reports :

OK, thanks.

Stack tracing seems a bit broken with 4k stacks.  Can you disable
CONFIG_4KSTACKS for future testing?

>  For the intel8x0 :
>  XRUN: pcmC1D0p
>  Stack pointer is garbage, not printing trace
>  Unexpected hw_pointer value [1] (stream = 1, delta: -16, max jitter =
>  64): wrong interrupt acknowledge?
>   [<c0105f3e>] dump_stack+0x1e/0x30
>   [<c033240d>] snd_pcm_period_elapsed+0x1cd/0x420
>   [<c03578cc>] snd_intel8x0_interrupt+0x1fc/0x260
>   [<c010739b>] handle_IRQ_event+0x3b/0x70
>   [<c0107824>] do_IRQ+0x194/0x1b0
>   [<c0105ac4>] common_interrupt+0x18/0x20
>   [<c0107754>] do_IRQ+0xc4/0x1b0
>   [<c0105ac4>] common_interrupt+0x18/0x20
>   [<c0108126>] do_softirq+0x46/0x60
>   [<c01077d9>] do_IRQ+0x149/0x1b0
>   [<c0105ac4>] common_interrupt+0x18/0x20
>   [<c01030f4>] cpu_idle+0x34/0x40
>   [<c053c809>] start_kernel+0x169/0x190
>   [<c010019f>] 0xc010019f
>   =======================
>   [<c0105f3e>] dump_stack+0x1e/0x30
>   [<c033240d>] snd_pcm_period_elapsed+0x1cd/0x420
>   [<c03578cc>] snd_intel8x0_interrupt+0x1fc/0x260
>   [<c010739b>] handle_IRQ_event+0x3b/0x70
>   [<c0107824>] do_IRQ+0x194/0x1b0
>   [<c0105ac4>] common_interrupt+0x18/0x20
>   [<c0107754>] do_IRQ+0xc4/0x1b0
>   [<c0105ac4>] common_interrupt+0x18/0x20
>   [<c0108126>] do_softirq+0x46/0x60
>   [<c01077d9>] do_IRQ+0x149/0x1b0
>   [<c0105ac4>] common_interrupt+0x18/0x20
>   [<c01030f4>] cpu_idle+0x34/0x40
>   [<c053c809>] start_kernel+0x169/0x190