Write-back/VM question

[Rajagopal Ananthanarayanan <ananth@sgi.com>]

One of the behaviors of the new VM seems
to be that it starts I/O on a written page
fairly early. This "aggressive" write is
great for streaming I/O, but seems to have
a penalty when the application has write-locality.
Dbench is a one case, which is write intensive
and a lot of the writes are to a previously written page.

I'm not exactly certain why starting write-out
early would cause problems, but I've a couple of
quick questions:

1. Is the page locked during write-out?

2. Is there a tuneable that I can use to
   control write-back behaviour?

thanks!


-- 
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Rajagopal Ananthanarayanan ("ananth")
Member Technical Staff, SGI.
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