Re: 2.6.12 Performance problems

From: Danial Thom (danial_thom_at_yahoo.com)
Date: 08/24/05

  • Next message: Jesper Juhl: "Re: 2.6.12 Performance problems" 
    Date:	Wed, 24 Aug 2005 09:33:15 -0700 (PDT)
To: Sven-Thorsten Dietrich <sven@mvista.com>

    --- Sven-Thorsten Dietrich <sven@mvista.com>
    wrote:

    > On Tue, 2005-08-23 at 13:10 -0700, Danial Thom
    > wrote:
    > >
    > > None of this is helpful, but since no one has
    > > been able to tell me how to tune it to
    > provide
    > > absolute priority to the network stack I'll
    > > assume it can't be done.
    >
    > History has proven that camp wrong almost 100%
    > of the time.
    >
    > You were told to turn off kernel preemption.
    >
    > A diligent comparison requires that, since 2.4
    > does not support kernel
    > preemption, and a fair comparison requires
    > holding all other things
    > constant.
    >
    > In addition, there were several IP-level
    > features mentioned in emails,
    > that have been added to 2.6.
    >
    > You need to make sure those are all off by
    > default, to keep your
    > comparison relevant.
    >
    > All the answers are before you, review those
    > emails, turn all that stuff
    > off and retest.

    I had tried turning off pre-emption, with little
    difference. However linux had the same properties
    before there was such a setting (of liking to
    drop packets here and there for no apparent
    reason under heavy load), so I didn't expect it
    to make a huge difference. It seems typing on the
    keyboard has the same effect with or without
    pre-emption enabled.

    IP is not involved in this test, so no IP stack
    issues should be relevent.

    Danial

                    
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  • Next message: Jesper Juhl: "Re: 2.6.12 Performance problems"

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