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Date: Tue, 13 Jan 2009 13:41:45 +0100
From: Christoph Mallon <christoph.mallon@gmx.de>
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Cc: Garrett Cooper <yanefbsd@gmail.com>, freebsd-x11 <freebsd-x11@freebsd.org>,
	Doug Barton <dougb@freebsd.org>,
	FreeBSD Current <freebsd-current@freebsd.org>
Subject: Re: X becomes unresponsive with nvidia and hardlocks with gdb (was
 Re: X becomes unresponsive with nvidia / xscreensaver and	desktop
 panics)
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Christoph Mallon schrieb:
> This also causes interesting cascades like stuttering music:
> - gcc preferred over X
> - X cannot redraw xterm fast enough
> - buffer of xterm fills
> - mplayer cannot write its status line to xterm and blocks
> - because mplayer blocks it cannot feed more data to the sound device
> - music stutters

I just realised that this is the classical priority inversion scenario: 
mplayer has a far higher priority than the compile job, but cannot run 
because it is waiting for X. This reminds me of the poor little mars 
probe Sojourner.