Re: [PARPORT] Parport sharing code on old 486 laptop

From: Philip Blundell (philb@gnu.org)
Date: Thu Aug 23 2001 - 17:31:22 EDT

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    >My guess is that the parport sharing code is causing some sort of
    >bottleneck which is only showing up on the slow 486. When the laptop is
    >using the 2.0.3 PLIP code (no parport sharing), it communicates fine with
    >the PIII which is using the more modern PLIP (sharing) code.

    I doubt this is the problem. The parport sharing code isn't *that*
    heavyweight.

    Does PLIP think it's using interrupts? (Check with dmesg.) It might be
    falling back to polled operation, which always brings a large performance hit.

    p.


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