[ANNOUNCE][RFC] PlugSched-6.1 for 2.6.13

From: Peter Williams (pwil3058_at_bigpond.net.au)
Date: 08/31/05

  • Next message: Roman Zippel: "Re: [Linux-fbdev-devel] [PATCH 1/1 2.6.13] framebuffer: bit_putcs() optimization for 8x* fonts" 
    Date:	Wed, 31 Aug 2005 10:46:07 +1000
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>

    This version contains a modified spa_ws scheduler with a more persistent
    bonus mechanism. Although the "bonus only at wake up" mechanism of the
    original worked well on the first systems it was tested on (an old SMP
    system and a 3GHz SMT system) subsequent tests on a 2GHz single
    processor system were disappointing. (Apart from a bug in the original
    implementation) the primary reason for this was that the X server was
    not always able to complete its work in the first time slice after
    waking and had to try and complete it without the benefit of the bonus
    which causes obvious delays when the system is loaded. The new
    mechanism is a simplification of the persistent interactive bonus
    mechanism in zaphod.

    A patch for 2.6.13 is available at:

    <http://prdownloads.sourceforge.net/cpuse/plugsched-6.1-for-2.6.13.patch?download>

    Very Brief Documentation:

    You can select a default scheduler at kernel build time. If you wish to
    boot with a scheduler other than the default it can be selected at boot
    time by adding:

    cpusched=<scheduler>

    to the boot command line where <scheduler> is one of: ingosched,
    nicksched, staircase, spa_no_frills, spa_ws or zaphod. If you don't
    change the default when you build the kernel the default scheduler will
    be ingosched (which is the normal scheduler).

    The scheduler in force on a running system can be determined by the
    contents of:

    /proc/scheduler

    Control parameters for the scheduler can be read/set via files in:

    /sys/cpusched/<scheduler>/

    Peter 

    -- 
Peter Williams                                   pwil3058@bigpond.net.au
"Learning, n. The kind of ignorance distinguishing the studious."
  -- Ambrose Bierce
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