[PARPORT] Re: lp speed next check (fwd)

Andrea Arcangeli (arcangeli@mbox.queen.it)
Thu, 18 Jun 1998 00:45:58 +0200 (CEST)

On Wed, 17 Jun 1998, Tim Waugh wrote:

>Here are the results of that test you asked for.

Hug, they are not very good ;-). At least the CPU usage should be minor.

Some time ago I had an HD that goes very faster with dma disabled
(according to hdparm -t) but the overall performances was highter with dma
enabled since even if the raw disk throughtput was lower, the CPU was more
free (I _hope_ that this will apply also to the current interrupt lp ;-).

>Tim. */
>---------- Forwarded message ----------
>Date: Wed, 17 Jun 1998 16:24:05 +0200
>From: Stanislav Brabec <utx@k332.feld.cvut.cz>
>To: tim@cyberelk.demon.co.uk
>Subject: lp speed next check
>Hallo Tim Waugh,
>I have checked 2.1.105 for printing speed.
>The speed was originally cca 130 kB/sec with polling and 93 kB/sec with IRQ.
>After tunelp /dev/lp0 -c 10000 printing speed have decreased to
>88kB/sec with IRQ.
>My machine is 6x86 MX200.
>My parport is configured in BIOS to IRQ7/DMA3 (it can use DMA).
>Now I'm upgrading to 2.1.106, so next test will be done on it.
>-- Stanislav Brabec

Andrea[s] Arcangeli

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