[lug] Linux App Midnight Problem

Nate Duehr nate at natetech.com
Thu Aug 26 18:54:41 MDT 2004

Gregory Seker wrote:

> Running Kernel 2.4.20 on an Intel STL2 motherboard.
> Application services a home brewed audio card every 23 mSec.
> Seems every so often (twice a month or so) the service routine
> is held off about 10-50 mSec just after midnight (like mSecs after
> midnight) causing problems.
>   - crond is disabled
>   - clock/date syncing is disabled (ntp, gps, etc).
> Trying to rule out kernel and OS processes.
> Any ideas or a good forum to look into ?
> -zeke

If your application has a requirement to absolutely run each and every 
23ms, it sounds like you need an RTOS, and not Linux?

What's the problem with just having the application "miss" once in a 
while -- audio missing a single 23ms sample would hardly be noticible to 
the human ear?

This appears to be an engineering design problem, not a Linux problem???

Nate Duehr, nate at natetech.com

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