RE: device polling takes more CPU hits??

From: Kelly Yancey (kbyanc_at_posi.net)
Date: 07/26/04

  • Next message: Moreno, Antonio (IPG-Europe): "Out of Office AutoReply: Returned mail: see transcript for details" 
    Date: Mon, 26 Jul 2004 13:18:46 -0700 (PDT)
To: Don Bowman <don@sandvine.com>

    On Mon, 26 Jul 2004, Don Bowman wrote:

    > kern.polling.burst: 1000
    > kern.polling.each_burst: 80
    > kern.polling.burst_max: 1000
    > kern.polling.idle_poll: 1
    > kern.polling.poll_in_trap: 0
    > kern.polling.user_frac: 5
    > kern.polling.reg_frac: 120
    > kern.polling.short_ticks: 29
    > kern.polling.lost_polls: 55004
    > kern.polling.pending_polls: 0
    > kern.polling.residual_burst: 0
    > kern.polling.handlers: 4
    > kern.polling.enable: 1
    > kern.polling.phase: 0
    > kern.polling.suspect: 50690
    > kern.polling.stalled: 25

      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).
    That was completely contrary to expectations and would love to hear how I
    could improve my test setup to see how changing those values are supposed
    to affect performance.

      Thanks,

      Kelly 

    --
Kelly Yancey  -  kbyanc@{posi.net,FreeBSD.org}  -  kelly@nttmcl.com
"The information of the people at large can alone make them the safe as they
 are the sole depositary of our political and religious freedom."
	-- Thomas Jefferson to William Duane, 1810. ME 12:417
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