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



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
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