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

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Message-ID: <Pine.LNX.4.61.0608201021340.9707@yvahk01.tjqt.qr>
Date:	Sun, 20 Aug 2006 10:22:56 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Denis Vlasenko <vda.linux@...glemail.com>
cc:	Eric Piel <Eric.Piel@...mplin-utc.net>, mplayer-users@...ayerhq.hu,
	linux-kernel@...r.kernel.org
Subject: Re: mplayer + heavy io: why ionice doesn't help?

>
>It helps. mplayer skips much less, but still some skipping is present.

Try with -ao alsa, then it should skip less, or at least, if it skip, skip 
back so that less audio is lost.
When playing audio-only files, it is always wise to specify e.g. -cache 320
which proved to be a good value for my workloads.

>I experimented with forcing entire file to be present in the
>pagecache, and in this case mplayer almost never skips.
>
>Looks like mplayer have very little tolerance for reads
>randomly taking more time to read input stream.
>
>However, I then looked into the mplayer's source
>(I wondered why it doesn't do read buffering itself)...
>
>The code is, um, less than pretty.

Jan Engelhardt
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