Date: Sat, 7 May 2005 02:50:07 GMT From: "Jin Guojun [VFFS]" <g_jin@lbl.gov> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/73744: printing via cups causes "Interrupt storm" warning, throttles output Message-ID: <200505070250.j472o7EJ083733@freefall.freebsd.org>
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The following reply was made to PR kern/73744; it has been noted by GNATS. From: "Jin Guojun [VFFS]" <g_jin@lbl.gov> To: bug-followup@FreeBSD.org Cc: bobf@mrp3.com Subject: Re: kern/73744: printing via cups causes "Interrupt storm" warning, throttles output 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 APIC related. Both machines experience this problem: stray irq7 stray irq7 Interrupt storm detected on "irq7: lpt0"; throttling interrupt source stray irq7 stray irq7 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 parallel printers. 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. **
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