kern/78711: Parallel printer incredibly slow

Suporte Matik asstec at matik.com.br
Sun Jul 3 00:48:28 GMT 2005


The following reply was made to PR kern/78711; it has been noted by GNATS.

From: Suporte Matik <asstec at matik.com.br>
To: Bruce Evans <bde at zeta.org.au>
Cc: Jason Bacon <bacon at smithers.neuro.mcw.edu>
Subject: Re: kern/78711: Parallel printer incredibly slow
Date: Sat, 12 Mar 2005 12:00:05 -0300

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 On Friday 11 March 2005 23:11, Bruce Evans wrote:
 > On Fri, 11 Mar 2005, Suporte Matik wrote:
 > > On Friday 11 March 2005 19:42, Jason Bacon wrote:
 > >>> Description:
 > >>
 > >> 	The parallel printer runs ridiculously slow.  It prints
 > >> normally for about 30 seconds, then prints one line every 5 or
 > >> 10 minutes. ...
 > >
 >
 > Try changing the interrupt storm threshold
 > (hw.intr_storm_threshold) to something larger than the printer can
 > generate.  FreeBSD-5.3 has interrupt storm detection that
 > misdetects the very high interrupt rates that can be caused by
 > printers (combined with low quality interrupt handling in the lpt
 > driver) as interrupt storms.
 >
 
 I increased it in 500er steps to 2500 (500 was default) and nothing=20
 changed in printing speed but the stray irq7 events do not appear=20
 anymore.=20
 
 
 Hans
 
 
 =2D-=20
 
 
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