Re: [PATCH] Remove nr_async_pages limit

[Zlatko Calusic <zlatko.calusic@iskon.hr>]

Alan Cox <alan@lxorguk.ukuu.org.uk> writes:

> > This patch removes the limit on the number of async pages in the
> > flight.
> 
> I have this in all  2.4.5-ac. It does help a little but there are some other
> bits you have to deal with too, in paticular wrong aging. See the -ac version
> 

Yes, I'll check -ac to see your changes. Although, I can't see what is
the impact of the unlimited number of the async pages on the aging, I
don't see a connection?!

In the mean time I tested the patch even more thoroughly under various
loads and I can't find any problem with it. Performance is same or
better a little bit, as you say. :)

My other patch (enlarging inactive dirty list) has a much bigger
impact on the aging process, but I also see only improvement with
it. I think that swap_out path should be tweaked a little bit (it is
too aggressive now), and then things will come up even better.

Regards,
-- 
Zlatko
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