Re: Change in default vm_dirty_ratio

[Andi Kleen <andi@firstfloor.org>]

Andrew Morton <akpm@linux-foundation.org> writes:
> 
> It seems too large.  Memory sizes are going up faster than disk throughput
> and it seems wrong to keep vast amounts of dirty data floating about in
> memory like this.  It can cause long stalls while the system writes back
> huge amounts of data and is generally ill-behaved.

A more continuous write out would be better I think. Perhaps the dirty ratio 
needs to be per address space?

> things are trivially tunable and you'd think that after all these years,
> distro initscripts would be establishing the settings, based upon expected
> workload, amount of memory, number and bandwidth of attached devices, etc.

Distro initscripts normally don't have any better clue about any of this
than the kernel.

-Andi