[mythtv-users] glitches in HDHR recordings every 5-6 seconds
mikep at randomtraveller.org.uk
Thu Apr 8 10:29:59 UTC 2010
Michael Rice wrote:
> Currently using:
> MythTV Version : 23548M
> MythTV Branch : branches/release-0-22-fixes
> Network Protocol : 50
> Library API : 0.22.20091023-1
> QT Version : 4.5.3
> There seems to be some kind of evil IO going on every few seconds that
> is causing this.
> I did an experiment and started one HDHR recording. I see that top
> reports a load of
> about 0.12. No problem. Looking at iotop I see that mythbackend is
> steadily writing
> 1700K/s to 2000K/s.
> Next I start another HDHR recording on the second tuner. Now load
> increases quickly
> until it is in the 3.00-3.50 range. Looking at iotop now shows a
> little higher 2000K/s to
> 2400 K/s. But it also show huge spikes every few seconds such at
> 19,000K/s to 20,000 K/s.
> It looks like the first recording is being written steadily but the
> second is being buffered and
> written in one big burst every 5-6 seconds. Does anyone know what
> might be causing this?
> I've had this HDHR for a long time and this seems to only have popped
> up within the last
> several months.
> Anyone have any ideas?
Possibly it's flushing the (buffered) seek information to the database.
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