Messages in this thread | | | Date | Sat, 11 Sep 1999 17:46:01 +0200 (CEST) | From | <> | Subject | Re: low-latency benchmarks: excellent results of RTC clock + SIGIO notification, audio-latency now down to 2.1ms! |
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On Sat, 11 Sep 1999, Benno Senoner wrote:
> Seems that under high disk I/O load, > (very seldom, about every 30-100secs) the process > gets woken up one IRQ period later. > Ideas why this happens.
this could be a lost RTC IRQ. If you are using 2048 Hz RTC interrupts, it just needs a single 1msec IRQ delay to lose an RTC IRQ. Especially SCSI disk interrupts are known to sometimes cause 1-2 millisecs IRQ delays. But before jumping to conclusions, what exactly are the symptoms, what does 'one IRQ period later' mean exactly?
-- mingo
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