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Date: Thu, 28 Feb 2008 20:36:24 +0100
From: Kris Kennaway <kris@FreeBSD.org>
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To: Teemu Korhonen <teemu.korhonen@mbnet.fi>
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Cc: freebsd-stable@freebsd.org
Subject: Re: jerky mouse still in 7.0-RELEASE
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Teemu Korhonen wrote:
> Did anyone find a solution to the "jerky mouse" -problem? It still 
> exists in 7.0-RELEASE.
> 
> I have pretty much exact same symptoms as in this post:
> http://lists.freebsd.org/pipermail/freebsd-stable/2008-January/039599.html

Part of the problem here is that these "symptoms" are far too generic 
for diagnosis and have a variety of known and unknown causes.

Some of the "known" causes include:

* Overloading the system transiently (e.g. if your KDE launches 30 
processes at once, the system is going to be a bit sluggish for a few 
seconds)

* Running powerd, which has poor interaction with interrupt delivery on 
at least one user's system (might be an ACPI issue or hardware-specific).

* Performing lots of I/O to a non-mpsafe filesystem like msdosfs.

The other causes have so far resisted understanding.

Kris