Re: sched_userret priority adjustment patch for sched_4bsd

From: John Baldwin (jhb_at_FreeBSD.org)
Date: 09/29/04

  • Next message: Julian Elischer: "Re: freebsd on mvme147" 
    To: freebsd-arch@FreeBSD.org
Date: Wed, 29 Sep 2004 10:55:47 -0400

    On Wednesday 29 September 2004 10:38 am, Stephan Uphoff wrote:
    > On Tue, 2004-09-28 at 10:56, John Baldwin wrote:
    > > If A has a priority boost from tsleep() this is intentional, however.
    > > The priroity boosts from tsleep() are _supposed_ to do this so as to
    > > favor interactive tasks. Note that if you add the code to always raise
    > > td_priority while in the kernel as below you may end up defeating this
    > > well-known feature of the 4BSD scheduler.
    >
    > OK - you and Julian convinced me that this is a feature that I should
    > have known about. Without test cases or interactivity benchmarks
    > discussions if this is still a desirable feature are probably useless.
    > I will revisit the this once test cases materialize or I have time to
    > think about a benchmark (Not likely anytime soon).

    That's ok. This discussion has been very fruitful on my end at least as
    talking this out has helped me get a much better grasp on how this stuff
    works on 4.x and should be done in 5.x to obtain at least somewhat similar
    behavior. 

    -- 
John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org
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