Why is /dev/lp slow?

[Mike Rubin]

In article <110 at westmark.UU.NET> dave at westmark.UU.NET (Dave Levenson) writes:
>Just upgraded from AT&T SysV/386r3.2 to SysV/386r3.2.2.  Nothing in
>the hardware has changed....
>Since upgrading to 3.2.2, the printer has slowed to about 30 cps or so.

Any other board in the system (whether it has a Unix driver installed
or not) using interrupt 7, will cause this behavior -- it will eat
some of the interrupts that come from the lp port.

Make sure you have no extraneous boards in your box.

--Mike Rubin <mike at attunix.att.com>