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Subject: Re: desktop and multimedia as an afterthought?
From: Thomas Charbonnel <thomas@undata.org>
To: Andrew Morton <akpm@osdl.org>
Cc: Paul Davis <paul@linuxaudiosystems.com>, albert@users.sourceforge.net,
       linux-kernel@vger.kernel.org, florin@sgi.com,
       linux-audio-dev@music.columbia.edu
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> And please ensure that people are setting xrun_debug, and are sending
> reports.
> 

Hi,

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 :

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
 [<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
 [<c010019f>] 0xc010019f


For the hdsp:
XRUN: pcmC2D0c
Stack pointer is garbage, not printing trace
XRUN: pcmC2D0c
 [<c0105f3e>] dump_stack+0x1e/0x30
 [<c0332521>] snd_pcm_period_elapsed+0x2e1/0x420
 [<c0368e94>] snd_hdsp_interrupt+0x174/0x180
 [<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
 [<c0332521>] snd_pcm_period_elapsed+0x2e1/0x420
 [<c0368e94>] snd_hdsp_interrupt+0x174/0x180
 [<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
 [<c0332521>] snd_pcm_period_elapsed+0x2e1/0x420
 [<c0368e94>] snd_hdsp_interrupt+0x174/0x180
 [<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

Thomas