Re: mplayer + heavy io: why ionice doesn't help?

[Eric Piel <Eric.Piel@tremplin-utc.net>]

08/18/2006 07:37 PM, Denis Vlasenko wrote/a écrit:
> Hi,
> 
> I noticed that mplayer's video playback starts to skip
> if I do some serious copying or grepping on the disk
> with movie being played from.
> 
> nice helps, but does not eliminate the problem.
> I guessed that this is a problem with mplayer
> failing to read next portion of input data in time,
> so I used Jens's ionice.c from
> Documentation/block/ioprio.txt
> 
> I am using it this:
> 
> ionice -c1 -n0 -p<mplayer pid>
> 
> but so far I don't see any effect from using it.
> mplayer still skips.
> 
> Does anybody have an experience in this?
Hello

IOnice only works with CFQ, have you checked that you are using the CFQ 
IO scheduler?
# cat /sys/block/hda/queue/scheduler   #put the name of YOUR harddisk

In case it's not the default IO scheduler, you can change it with:
# echo cfq > /sys/block/hda/queue/scheduler


My two cents...
See you,
Eric