Re: Understanding I/O behaviour

[Martin Knoblauch]

--- Jesper Juhl <jesper.juhl@xxxxxxxxx> wrote:

> On 06/07/07, Robert Hancock <hancockr@xxxxxxx> 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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/