Re: la la la la ... swappiness

[Christoph Lameter]

On Sun, 3 Dec 2006, Linus Torvalds wrote:

> Wouldn't it be much nicer to just lower the dirty-page limit?
> 
> 	echo 1 > /proc/sys/vm/dirty_background_ratio
> 	echo 2 > /proc/sys/vm/dirty_ratio

Dirty ratio cannot be set to less than 5%. See 
mm/page-writeback.c:get_dirty_limits().

> or something. Which we already discussed in another thread and almost 
> already decided we should lower the values for big-mem machines..

We also have an issue with cpusets. Dirty page throttling does not work in 
a cpuset if it is relatively small to the total memory on the system since 
we calculate the percentage of the total memory and not a percentage of 
the memory the process is allowed to use.
-
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/