Date: Thu, 27 Sep 2001 12:41:51 -0400 From: Garance A Drosihn <drosih@rpi.edu> To: "Marc G. Fournier" <scrappy@hub.org>, <freebsd-stable@FreeBSD.ORG> Subject: Re: Printer daemon killing machine ... ? Message-ID: <p05101007b7d905c7896e@[128.113.24.47]> In-Reply-To: <20010927100726.F58293-100000@mail1.hub.org> References: <20010927100726.F58293-100000@mail1.hub.org>
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At 10:09 AM -0400 9/27/01, Marc G. Fournier wrote: >Just upgraded to the most recent version of 4.4, via CVSup ... we have a >printer (HP 880c) attached to the back, that we have our windows boxes >printing to via samba ... if a print job is sent, the machine pretty >much dies for several minutes and then goes on its merry way ... > >the machine is a dual celeron with 256meg of RAM ... not what I'd >consider to be a small machine ... 0 swap is being used ... > >something I'm overlooking, as far as config might be concerned? How is the printer connected? (serial or parallel?) Some time ago there was a thread on "stray irq's 7, printing hangs, about 20000-50000 irqs per second", which had to do with the configuration of a parallel-connected HP printer. I think the key suggestion in that thread was: Antony T Curtis <antony@abacus.co.uk>: You may want to investigate changing the default mode of the printer port driver by playing with the flags for the printer port device (see `man ppc' ) ECP mode should give the best performance by using a DMA channel to transfer data and only issuing an IRQ at the end of DMA. Should yield up to 2MB/s. However, I always seem to get occasional bytes going missing when printing to a Panasonic laser printer. Otherwise, one can opt for EPP or PS/2 mode, which should enable the small FIFO available in most printer ports - this should slash the number of IRQs. disclaimer: I'm just guessing here. Everything that I do with printing is done with network-connected printers. I avoid serial and parallel connections! -- Garance Alistair Drosehn = gad@eclipse.acs.rpi.edu Senior Systems Programmer or gad@freebsd.org Rensselaer Polytechnic Institute or drosih@rpi.edu To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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