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    SubjectRe: CONFIG_PREEMPT and server workloads
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    On Thu, 18 Mar 2004 14:24:59 EST, Robert Love said:
    > On Thu, 2004-03-18 at 14:08, Takashi Iwai wrote:
    >
    > > oh, sorry, maybe i forgot to tell you that it has been already there
    > > :)
    > >
    > > # echo 1 > /proc/asound/card0/pcm0p/xrun_debug
    > >
    > > this will show the stacktrace when a buffer overrun/underrun is
    > > detected in the irq handler. it's not perfect, though.
    >
    > Excellent!
    >
    > Has this resulted in anything useful?
    >
    > With KALLSYMS=y, a lot of users now become intelligent bug testers.
    >
    > Eh, except that I do not have that procfs entry on my system..

    Is one of these yours? My machine has 3 (but only one soundcard) ;)

    % find /proc/asound/ -name xrun_debug -ls
    4480 0 -r--r--r-- 1 root root 0 Mar 19 16:00 /proc/asound/card0/pcm1c/xrun_debug
    4470 0 -r--r--r-- 1 root root 0 Mar 19 16:00 /proc/asound/card0/pcm0c/xrun_debug
    4462 0 -r--r--r-- 1 root root 0 Mar 19 16:00 /proc/asound/card0/pcm0p/xrun_debug

    (Are these 3 different controls, or 3 places to set the same variable?)
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