Lennart Sorensen wrote:..
Well the system is setup like this:
Core 2 Quad Q6600 CPU (2.4GHz quad core).
Asus P5K mainboard (Intel P35 chipset)
6GB of ram
PVR500 dual NTSC tuner pci card
So the behaviour with cfq is:..
Disk light seems to be constantly on if there is any disk activity. iotop
can show a total io of maybe 1MB/s and the disk light is on constantly.
Lennart,
I wonder if the problem with your system is really a Myth/driver issue?
Curiously, I have a HVR-1600 card here, and when recording analog TV with
it the disk lights are on constantly. The problem with it turns out to
be mythbackend doing fsync() calls ten times a second.
My other tuner cards don't have this problem.
So perhaps the PVR-500 triggers the same buggy behaviour as the HVR-1600?
To work around it here, I decided to use a preload library that replaces
the frequent fsync() calls with a more moderated behaviour:
http://rtr.ca/hvr1600/libfsync.tar.gz
Grab that file and try it out. Instructions are included within.
Report back again and let us know if it makes any difference.
Someday I may try and chase down the exact bug that causes mythbackend
to go fsyncing berserk like that, but for now this workaround is fine.