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Re: parallel port using lots of CPU

On Mon, Sep 20, 2004 at 05:13:05PM -0500, Kirk Strauser wrote:
> On Monday 20 September 2004 17:07, Marc Wilson wrote:
> > Uh, that's a CUPS back-end, not the hardware directly.  The port itself
> > cannot consume CPU.  Well, it can, but not in the sense that you mean.
> In what way do *you* think it can consume CPU?

That's easy... it can do DMA and force the CPU off the bus, then not allow
it back on again.  It can assert endless interrupts and lock the CPU up
trying to respond to them.

 Marc Wilson |     Teach children to be polite and courteous in the
 msw@cox.net |     home, and, when they grow up, they won't be able to
             |     edge a car onto a freeway.

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