Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]

Arjan van de Ven
2007-04-15T23:24:29Z

On Mon, 2007-04-16 at 01:49 +0300, Ismail Dönmez wrote:
> Hi,
> On Friday 13 April 2007 23:21:00 Ingo Molnar wrote:
> > [announce] [patch] Modular Scheduler Core and Completely Fair Scheduler
> > [CFS]
> >
> > i'm pleased to announce the first release of the "Modular Scheduler Core
> > and Completely Fair Scheduler [CFS]" patchset:
> >
> > http://redhat.com/~mingo/cfs-scheduler/sched-modular+cfs.patch
>
> Tested this on top of Linus' GIT tree but the system gets very unresponsive
> during high disk i/o using ext3 as filesystem but even writing a 300mb file
> to a usb disk (iPod actually) has the same affect.

just to make sure; this exact same workload but with the stock scheduler
does not have this effect?

if so, then it could well be that the scheduler is too fair for it's own
good (being really fair inevitably ends up not batching as much as one
should, and batching is needed to get any kind of decent performance out
of disks nowadays)

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