kern/78711: Parallel printer incredibly slow

[Suporte Matik]

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 
changed in printing speed but the stray irq7 events do not appear 
anymore. 


Hans


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