RE: device polling takes more CPU hits??

From: Don Bowman (don_at_sandvine.com)
Date: 07/26/04

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    To: 'Luigi Rizzo' <rizzo@icir.org>, Kelly Yancey <kbyanc@posi.net>
Date: Mon, 26 Jul 2004 16:28:56 -0400

    From: Luigi Rizzo [mailto:rizzo@icir.org]
    > On Mon, Jul 26, 2004 at 01:18:46PM -0700, Kelly Yancey wrote:
    > ...
    > > Out of curiousity, what sort of testing did you do to
    > arrive at these
    > > settings? I did some testing a while back with a SmartBits
    > box pumping
    > > packets through a FreeBSD 2.8Ghz box configured to route
    > between two em
    > > gigabit interfaces; I found that changing the burst_max and
    > each_burst
    > > parameters had almost no effect on throughput (maximum 1%
    > difference).
    >
    > fast boxes are pci-bus limited, not CPU limited(*) so
    > changing the burst
    > size (which basically amortizes some CPU costs) has little if any
    > effect.

    The PCI-X bus will probably be 64-bit 133MHz in this case,
    the limit moves up to the P64H2 hub for large packets,
    to the CPU for small packets. Polling becomes quite
    critical to prevent livelock.

    --don
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