2.6.12 Performance problems

From: Danial Thom (danial_thom_at_yahoo.com)
Date: 08/21/05

  • Next message: Luben Tuikov: "Re: [PATCH 2.6.12.5 1/2] lib: allow idr to be used in irq context" 
    Date:	Sun, 21 Aug 2005 08:46:54 -0700 (PDT)
To: linux-kernel@vger.kernel.org

    I just started fiddling with 2.6.12, and there
    seems to be a big drop-off in performance from
    2.4.x in terms of networking on a uniprocessor
    system. Just bridging packets through the
    machine, 2.6.12 starts dropping packets at
    ~100Kpps, whereas 2.4.x doesn't start dropping
    until over 350Kpps on the same hardware (2.0Ghz
    Opteron with e1000 driver). This is pitiful
    prformance for this hardware. I've
    increased the rx ring in the e1000 driver to 512
    with little change (interrupt moderation is set
    to 8000 Ints/second). Has "tuning" for MP
    destroyed UP performance altogether, or is there
    some tuning parameter that could make a 4-fold
    difference? All debugging is off and there are
    no messages on the console or in the error logs.
    The kernel is the standard kernel.org dowload
    config with SMP turned off and the intel ethernet
    card drivers as modules without any other
    changes, which is exactly the config for my 2.4
    kernels.

    Danial

                    
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  • Next message: Luben Tuikov: "Re: [PATCH 2.6.12.5 1/2] lib: allow idr to be used in irq context"

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