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From: Ismail =?utf-8?q?D=C3=B6nmez?= <ismail@pardus.org.tr>
Organization: TUBITAK/UEKAE
To: Arjan van de Ven <arjan@infradead.org>
Subject: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
Date: Mon, 16 Apr 2007 02:33:39 +0300
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Cc: Ingo Molnar <mingo@elte.hu>, linux-kernel@vger.kernel.org,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Con Kolivas <kernel@kolivas.org>, Nick Piggin <npiggin@suse.de>,
       Mike Galbraith <efault@gmx.de>, Thomas Gleixner <tglx@linutronix.de>
References: <20070413202100.GA9957@elte.hu> <200704160149.42914.ismail@pardus.org.tr> <1176679389.3945.66.camel@laptopd505.fenrus.org>
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On Monday 16 April 2007 02:23:08 Arjan van de Ven wrote:
> 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)

Tried with make install in kdepim (which made system sluggish with CFS) and 
the system is just fine (using CFQ).

Regards,
ismail