Re: sched_userret priority adjustment patch for sched_4bsd

From: Stephan Uphoff (ups_at_tree.com)
Date: 09/29/04

  • Next message: Stephan Uphoff: "Re: scheduler (sched_4bsd) questions" 
    To: John Baldwin <jhb@FreeBSD.org>
Date: Wed, 29 Sep 2004 10:38:54 -0400

    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).

            Stephan

    _______________________________________________
    freebsd-arch@freebsd.org mailing list
    http://lists.freebsd.org/mailman/listinfo/freebsd-arch
    To unsubscribe, send any mail to "freebsd-arch-unsubscribe@freebsd.org"

  • Next message: Stephan Uphoff: "Re: scheduler (sched_4bsd) questions"