kern/73744: printing via cups causes "Interrupt storm" warning,
Jin Guojun [VFFS]
g_jin at lbl.gov
Fri May 6 19:50:07 PDT 2005
The following reply was made to PR kern/73744; it has been noted by GNATS.
From: "Jin Guojun [VFFS]" <g_jin at lbl.gov>
To: bug-followup at FreeBSD.org
Cc: bobf at mrp3.com
Subject: Re: kern/73744: printing via cups causes "Interrupt storm" warning,
Date: Fri, 06 May 2005 19:46:40 -0700
This problem is still existing in 5.4-RC4.
First I thought this my be related to APIC issue since one of my machine is
ASUS P2B-DS (dual P-III), which is on the APIC blacklist, that has to
have APIC disabled.
The other of machine is AMD XP, which is APIC enabled. So, it seems not
Both machines experience this problem:
Interrupt storm detected on "irq7: lpt0"; throttling interrupt source
too many stray irq 7's: not logging anymore
This is not just for CUPS. It is for lpr or any printing job sent to
The printer will still print, but it speed is about two lines per minute.
lptcontrol -p /dev/lpt0
does work in this problem.
------------ Jin Guojun -----------
Distributed Systems Department http://www.dsd.lbl.gov/~jin
Lawrence Berkeley National Laboratory, Berkeley, CA 94720
--------------- original message --------------------
following a very recent portupgrade to RELEASE_5_3_0, printing via cups now causes the following error message to appear on the console:
Interrupt storm detected on "irq7:lpt0": throttling interrupt source
This caused printing to be GROSSLY unacceptably slow
stopping cups, then using 'lptcontrol -p /dev/lpt0', then restarting it again worked around the problem and restored acceptable print performance.
This is the first time I have seen this happen, and I have been printing on this machine for quite some time.
More information about the freebsd-bugs