Re: [MPlayer-users] mplayer + heavy io: why ionice doesn't help?

[Corey Hickey <bugfood-ml@xxxxxxxxxx>]

The Wanderer wrote:
> > 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
>
> (Where is this path located? It certainly isn't part of the MPlayer
> source tree.)

In the Linux kernel source, it seems.

> > 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.

This is the first I've ever heard of ionice, but ioprio.txt mentions 
that CFQ is the only I/O scheduler that supports priorities. Are you 
using CFQ?

Besides that though, the usual solution to heavy I/O causing skipping is 
to use -cache, just like The Wanderer advised.

-Corey
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