Re: [PATCH *] VM patch w/ drop behind for 2.4.0-test8-pre1

[arjan@fenrus.demon.nl (Arjan van de Ven)]

You wrote:

> - drop_behind(), when we do a readahead, move the pages
>   'behind' us to the inactive list .. this way we can do
>   streaming IO without putting pressure on the working set
> - deactivate pages in generic_file_write(), this does
>   basically the same ... by moving the pages we write to 
>   to the inactive_dirty list, a big download, etc.. doesn't
>   impact the working set of the system

> I'm particularly interested in the impact of streaming IO on
> the performance of the rest of the system with this patch, but
> of course also in the performance of the streaming IO itself.

I must say your enhancements have a very positive effect. 
"dbench 48" results:

test7 plain	35   MB/s
test8p1 riel1	27   MB/s
test8p1 riel2	34.2 MB/s  <-- latest patch

so with this patch the VM approaches test7 behavior _really_ close, but 
with the enhancement in interactive performance!

Greetings,
   Arjan van de Ven
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