Re: [Soekris] Re: bridge with access on both interfaces

From: Poul-Henning Kamp (phk_at_phk.freebsd.dk)
Date: 12/25/03

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    To: Luigi Rizzo <rizzo@icir.org>
Date: Thu, 25 Dec 2003 19:41:20 +0100

    In message <20031225102549.A79161@xorpc.icir.org>, Luigi Rizzo writes:

    >If you have shared interrupts, and one of the interfaces is not up, you
    >end up doing a lot of useless calls to sis_stop(), which is terribly
    >expensive (it even includes a DELAY(1000) call).
    >At the very least, one should add a 'stopped' flag so that
    >sis_stop() is only called when necessary -- or possibly even
    >never at all.
    >
    >The second (minor) cause of performance loss are the calls
    >(not shown above)
    >to disable and re-enable the interrupts around the driver. These are
    >completely useless, yet cause some extra PCI transactions.

    I don't know if it is correct, but at the very least I have thought
    the same thoughts when I looked at the driver last, but I didn't
    get time to try out the idea...

    Somebody with some spare time should look at this...

    Poul-Henning 

    -- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.
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