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From: "Norbert Koch" <NKoch@demig.de>
To: "dave" <dmehler26@woh.rr.com>, <freebsd-questions@freebsd.org>
Date: Wed, 3 Aug 2005 08:47:13 +0200
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Subject: RE: interrupt issue, storm on parallel port, 5.4
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> Hello,
>     I've got a printserver that has an hp deskjet printer attached via
> parallel port. I just got an email with the following message:
> 
> Interrupt storm detected on "irq7: lpt0"; throttling interrupt source
> 
> I've checked lpt0 in dmesg and this error didn't come up then, do 
> i have to
> worry about this? This is on a 5.4-p1 system, if so is there a fix?
> Thanks.
> Dave.

I have a similar problem with my hp laserjet.
Setting sysctl hw.intr_storm_threshold to a higher value seems to help.

Norbert