Parallel Printing
Matthew Dillon
dillon at apollo.backplane.com
Thu Oct 28 01:20:28 PDT 2004
:Hi,
: When printing with a parallel printer I get a lot of messages on the
: console like,
:
: intr 7 at 55539 hz, livelocked ! limiting at 20000 hz
: intr 7 at 9959 hz, removing livelock limit.
:
: Switching to polled mode with lptcontrol(8) fixes this but I am
: wondering whether I should try,
:
: options DEVICE_POLLING
:
: in my kernel. I do have a dc0 ( AMDTek Comet ) NIC which is supposed
: to support this but reading LINT gives the impression that this is a
: work in progress.
:
: At the moment I am lucky enough that the GENERIC kernel supports all
: my hardware. I do have to disable acpi to get the floppy drive
: recognised though.
:
: Just updated STABLE but this made no difference to any of this. Very
: smooth update though, thank you !
:
: Thanks for any help,
: John Duncan
Do whatever works. You could just try bumping up the livelock
frequency trip points which are the kern.livelock_limit and
kern.livelock_fallback sysctls.
I would have thought that the parallel port's FIFO would be enough to
reduce the interrupt rate to reasonable levels but I guess not. polling
is certainly one solution. If the transfer rate isn't too slow for you
that would be my first choice.
-Matt
Matthew Dillon
<dillon at xxxxxxxxxxxxx>
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