Date: Wed, 1 Nov 2006 09:53:49 +0000 From: Anton Shterenlikht <mexas@bristol.ac.uk> To: perryh@pluto.rain.com Cc: freebsd-questions@freebsd.org Subject: Re: lpt0 printer slows system response significantly Message-ID: <20061101095349.GA61957@mech-aslap33.men.bris.ac.uk> In-Reply-To: <45485490.D5trgMIQ1JYsEyMX%perryh@pluto.rain.com> References: <20061101000426.GA60303@mech-aslap33.men.bris.ac.uk> <45485490.D5trgMIQ1JYsEyMX%perryh@pluto.rain.com>
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On Wed, Nov 01, 2006 at 12:02:24AM -0800, perryh@pluto.rain.com wrote: > > PID USERNAME THR PRI NICE SIZE RES STATE TIME WCPU COMMAND > > 18 root 1 -60 -179 0K 8K *Giant 15:09 77.05% irq7: lpt0 > > 11 root 1 171 52 0K 8K RUN 48.0H 11.13% idle > > The interrupt service for the parallel port is using over 3/4 of > the CPU, and half of the rest is "idle". > > I take it this is a laser printer, which can consume bytes from the > parallel port as fast as the processor can send them. Top-of-head > dump of ways to cut down on the interrupt traffic: yes, it is lj2100. > * Somehow tell the printer not to receive so quickly. how can I do this? thanks anton
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