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
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