Re: [linux-audio-dev] streaming with 2.4.0test11

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Subject: Re: [linux-audio-dev] streaming with 2.4.0test11
From: Paul Barton-Davis (pbd_AT_Op.Net)
Date: Wed Nov 22 2000 - 04:00:34 EET


>But, but, basicly the same idea. Now on to the problem. Most of the time
>running my test stream (32bit-10ch-44kHz, not much but good for basic
>testing) goes smoothly. I can stress both cpu- and disk-wise and the
>buffer-area stays full. But in some circumstances ('find /', and few other
>heavy io-operations), the audiothread (speaking in lad terms :)) starts to
>dominate and eats away the whole db-area (that's upto 1-2secs of audio!).
>The same happens with SCHED_FIFO scheduling. Even changing the relative
>priority or audio and disk threads, or adding sched_yield()s doesn't seem
>to help.
>
>Now I suspect I'm just running out of disk i/o capacity, although it seems
>odd that processes running as normal user without rt-priority can choke

wait kai - are you running the thread that does the disk i/o with
SCHED_FIFO ? because if not, surely its not suprising that other
disk-ful activities can choke the disk thread, and thus cause the
audio thread some problems.

--p


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