RE: device polling takes more CPU hits??

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

  • Next message: James: "Re: device polling takes more CPU hits??" 
    To: 'James' <haesu@towardex.com>, freebsd-net@freebsd.org
Date: Mon, 26 Jul 2004 10:52:23 -0400

    From: James [mailto:haesu@towardex.com]
    > Hi all,
    >
     ...

    >
    > Any idea why device polling is kind of having... negative
    > impact? Is this b/c
    > I have SMP compiled on a box that really doesn't have two
    > cpu's?? Is SMP+APIC_IO
    > support even required for HTT use?

    I would post the output of 'sysctl kern.polling', its likely
    some of the tuning there is insufficient.
    What do you have HZ set to (sysctl kern.clockrate)? I would
    probably have it set to ~1000.
    You will want 'machdep.cpu_idle_hlt=1'.

    --don
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  • Next message: James: "Re: device polling takes more CPU hits??"