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SubjectRe: [ANNOUNCE][RFC] PlugSched-6.1.3 for 2.6.13 and 2.6.14-rc4
Peter Williams wrote:
> This version contains a new scheduler, spa_svr, which is a minor
> extension of spa_no_frills intended for use on servers. It makes no
> attempt to improve interactive responsiveness but includes a simplified
> version of the throughput bonus mechanism found in Zaphod. This
> mechanism attempts to minimize the time tasks spend on run queues
> waiting for CPU access when the system is moderately loaded by giving
> tasks temporary priority bonuses based on the relationship between the
> recent average time spent on run queues and on a cpu per cycle.
> (Although it's effectiveness tends to disappear when the system is fully
> loaded, it is still useful as considerable delay can be seen on systems
> with quite low average loads due to lack of serendipity.)
> A patch for 2.6.14-rc4 is available at:
> <>
> and a patch to upgrade the 6.1.2 version for 2.6.13 to 6.1.3 is
> available at:
> <>
> 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, spa_svr 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

A patch for the 2.6.14 official release kernel is now available at:


Peter Williams

"Learning, n. The kind of ignorance distinguishing the studious."
-- Ambrose Bierce
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