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    SubjectRe: PROBLEM: SIS7019 stops recording after 42 min
    2010/6/21 Hans Schou <linux@schou.dk>:
    > 2010/6/21 David Dillow <dave@thedillows.org>:
    >
    >>> Only 35 minutes of recording but I was running in 50min.

    >>
    >> Ok, cool, we see the problem with arecord as well, though you were
    >> getting overrun messages as well?
    >
    > Yes, a lot of overrun. At least one per second.
    >
    >>> How do I enable SND_PCM_XRUN_DEBUG with sox?
    >>
    >> Sorry, that should be CONFIG_SND_PCM_XRUN_DEBUG in the kernel
    >> configuration, but if we can demonstrate this with arecord, there's no
    >> real reason to recompile your kernel at this point.
    >
    > OK, I'll skip that. It takes rather long time to compile.
    >
    >>> Right now uptime says
    >>>    load average: 0.19, 0.21, 0.18
    >>> but strace and top is the bad guys, not arecord.
    >>
    >> An overrun means that arecord didn't run for 500ms, and the load average
    >> won't really tell you much about that -- latency can happen with low
    >
    > Well, I did not see that with sox. It was running fine for 42 min.
    >
    >> loads. That said, I'm suspecting that you've found a problem in the
    >> driver, and I'd lay odds it is in the handling of multiple periods per
    >> buffer.
    >
    >> I don't know the options available on sox, but if you can use arecord to
    >> reproduce, then that is probably the best tool for the job. Can you set
    >> it up to use two periods per buffer and see if you still can reproduce?
    >> Options would look like -B 250000 -F 125000. A second test with -B
    >> 1000000 -F 500000 would be interesting, if the hw can handle buffers of
    >> that size -- I don't recall offhand.
    >
    > I have just started it with  -B 250000 -F 125000 and get a lot of overrun.
    > I skipped using strace to make less stress.
    >
    > cmdline is now:
    > arecord -B 250000 -F 125000 -c 1 -r 44100 -f S16 -M -D hw:0,0 -v arec.wav

    This gave a 191069598 bytes long file. What does this test actually
    show regarding the original problem with stopping after 42 min?

    I have just started:
    arecord -B 1000000 -F 500000 -c 1 -r 44100 -f S16 -M -D hw:0,0 -v arec.wav
    and I only got one overrun. What I did was that logged in on another
    ssh console and executed "ls".

    Here is a complete screen dump after running 2 minutes:
    + arecord -B 1000000 -F 500000 -c 1 -r 44100 -f S16 -M -D hw:0,0 -v arec.wav
    Recording WAVE 'arec.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Mono
    Hardware PCM card 0 'SiS7019' device 0 subdevice 0
    Its setup is:
    stream : CAPTURE
    access : MMAP_INTERLEAVED
    format : S16_LE
    subformat : STD
    channels : 1
    rate : 44100
    exact rate : 44100 (44100/1)
    msbits : 16
    buffer_size : 32768
    period_size : 22050
    period_time : 500000
    tick_time : 0
    tstamp_mode : NONE
    period_step : 1
    sleep_min : 0
    avail_min : 22050
    xfer_align : 22050
    start_threshold : 1
    stop_threshold : 32768
    silence_threshold: 0
    silence_size : 0
    boundary : 1445068800
    overrun!!! (at least 826.140 ms long)
    Status:
    state : XRUN
    trigger_time: 1277144902.603264297
    tstamp : 1277144903.428975238
    delay : 0
    avail : 44108
    avail_max : 44108
    overrun!!! (at least 0.077 ms long)
    Status:
    state : XRUN
    trigger_time: 1277144938.378978657
    tstamp : 1277144938.379038604
    delay : 0
    avail : 42344
    avail_max : 42344

    /hans
    /hans
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