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List:       freebsd-hackers
Subject:    Re: tcp/ip over lp0
From:       Nate Williams <nate () mt ! sri ! com>
Date:       1996-08-01 17:23:43
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> > That's a *really* long cable.  Also, *MAKE SURE* that neither machine
> > has another device using it's interrupt, and that there is a driver for
> > all hardware that generate interrupts.
> > 
> > If you happen to use the commonly-used IRQ 7 for the parallel port and
> > something other than the parallel port either generates interrupts on 7
> > or one another unregistered port you'll have lots of problems.
> > 
> > Make sure both machines have don't have IRQ conflicts and shorten the
> > cable.
> > 

> i tried another shorter cable and it's the same - so it must be the
> controller - can some bios settings or things like AUTO_EOI* or
> DUMMY_NOOPS have any influence ?

The BIOS settings could affect it, but I doubt the kernel setting would.

> - as far as i'm aware of all interrupts are correct set (ok i
> think nearly all are used - serial: 3,4,9(2), parallel: 7, ethernet: 5,
> sound: 11, ide controllers: 14,15 - should'nt i get something like stray
> interrups if something is wrong ? will this help you ?

The parallel controller would 'swallow' them, so you wouldn't see them,
except that lpt0 wouldn't work very well. :(

> graichen@mordillo:~> vmstat -i
> interrupt      total      rate
> clk0 irq0      212749       99
> rtc0 irq8      272238      127
> fdc0 irq6           1        0
> wdc0 irq14      20300        9
> mcd0 irq10          1        0
> vt0 irq1         9619        4
> sio0 irq4        6251        2
> sio3 irq9       53109       24
> ed0 irq5            1        0
> Total          574269      269
> 
> there's no irq 7 to see - but i haven't used it until the vmstat - does the
> lptcontrol -p/-i affect the lp0 device too or is it always using the interrupt
> version ?
> 
> do you have any idea ? - i'll try to experiment further.
> 
> thanks in advance - t
> 
> -- 
>   thomas graichen    graichen@mail.physik.fu-berlin.de    graichen@FreeBSD.org
> 
>   perfection is reached, not when there is no longer anything to add, but when
>       there is no longer anything to take away    antoine de saint-exupery

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