Messages in this thread | | | Date | Fri, 03 Apr 2009 11:05:04 -0400 | From | Mark Lord <> | Subject | Re: Linux 2.6.29 |
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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.
Cheers
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