Re: device polling takes more CPU hits??

From: James (haesu_at_towardex.com)
Date: 07/26/04

  • Next message: Kelly Yancey: "RE: device polling takes more CPU hits??" 
    Date: Mon, 26 Jul 2004 16:17:00 -0400
To: Don Bowman <don@sandvine.com>

    Don,

    > Hmm, this is more interesting.
    > Since you are SMP, and using POLLING, i assume you did
    > like me and commented out the !POLLING in SMP #error statement.

    Yep. Otherwise kernel won't compile ;-)

    > You definitely want the halt on idle. The polling in idle
    > doesn't work anyway, so try disabling it.

    Yea, I made sure cpu_idle_hlt set to 1, and also made sure polling.idle_poll
    is set to 0. Then turned on device polling again.. CPU load again goes higher..

    I then tried setting burst_max to 1000 and each_burst to 80, hence duplicating
    the parameters you are using on your system. The CPU load then went down, but
    its still not any lower than running it w/o device polling at all (meaning,
    device polling still isn't working properly).

    I have two boxes behind em0 that I can use to generate 250kpps to another vlan
    within em0 card as a test, so that bge0 is not involved in the stress test.
    Even when doing so, CPU load climbs higher with device polling turned on.
    Opened up systat, etc to check the interrupts, and em0 is generating 0
    interrupts with device polling on (as obvious), but general interrupt load
    climbs rock high.. so I don't know what's causing it to climb. Cleared the
    firewall rules as well as a test... no difference :(

    Oh also, just FYI, each vlan interface has link0 set, since em(4) supports
    hardware 802.1q tag/detagging.

    Thanks!
    -J 

    -- 
James Jun                                            TowardEX Technologies, Inc.
Technical Lead                        Network Design, Consulting, IT Outsourcing
james@towardex.com                  Boston-based Colocation & Bandwidth Services
cell: 1(978)-394-2867           web: http://www.towardex.com , noc: www.twdx.net
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  • Next message: Kelly Yancey: "RE: device polling takes more CPU hits??"