Date: Tue, 23 Aug 2005 23:36:18 +0200 From: Uwe Laverenz <uwe@laverenz.de> To: freebsd-questions@freebsd.org Subject: Re: Problem with irq and printing system Message-ID: <20050823213618.GB3407@laverenz.de> In-Reply-To: <1124825539.51697.10.camel@Endeavour.lordofunix.org> References: <1124825539.51697.10.camel@Endeavour.lordofunix.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Tue, Aug 23, 2005 at 09:32:19PM +0200, Jose Luis Alarcon Sanchez wrote:
> Interrupt storm detected on "irq7: lpt0"; throttling interrupt source
>
> What is the meaning of this message?. Have this problem a solution?.
This is a very annoying "feature" in FreeBSD: printing causes a high
rate of interrupts and the kernel tries to reduce this. AFAIK there are
two possible ways to solve this:
1. To increase the threshold for this interrupt storm detection just add
the following line to your /etc/sysctl.conf:
hw.intr_storm_threshold=4096
2. Let the parallel port run via polling instead of interrupts (this
causes high loads), add the following line to your
/boot/devices.hints:
hint.ppc.0.flags="0x28"
HTH,
Uwe
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20050823213618.GB3407>