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DateFri, 6 Jul 2007 00:54:13 -0700 (PDT)
FromMartin Knoblauch <>
SubjectRe: Understanding I/O behaviour
--- Jesper Juhl <jesper.juhl@gmail.com> wrote:> On 06/07/07, Robert Hancock <hancockr@shaw.ca> wrote:
> [snip]
> >> > Try playing with reducing /proc/sys/vm/dirty_ratio and see how that
> > helps. This workload will fill up memory with dirty data very
> quickly,
> > and it seems like system responsiveness often goes down the toilet
> when
> > this happens and the system is going crazy trying to write it all
> out.
> >
> 
> Perhaps trying out a different elevator would also be worthwhile.
> 
 AS seems to be the best one (NOOP and DeadLine seem to be equally OK).
CFQ gives less (about 10-15%) throughput except for the kernel with the
cfs cpu scheduler, where CFQ is on par with the other IO schedulers.

Thanks
Martin

------------------------------------------------------
Martin Knoblauch
email: k n o b i AT knobisoft DOT de
www:   http://www.knobisoft.de
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