Re: on load control / process swapping

[Matt Dillon <dillon@earth.backplane.com>]

:
:Ahhh, so FreeBSD _does_ have a maxscan equivalent, just one that
:only kicks in when the system is under very heavy memory pressure.
:
:That explains why FreeBSD's thrashing detection code works... ;)
:
:(I'm not convinced, though, that limiting the speed at which we
:scan the active list is a good thing. There are some arguments
:in favour of speed limiting, but it mostly seems to come down
:to a short-cut to thrashing detection...)

    Note that there is a big distinction between limiting the page
    queue scan rate (which we do not do), and sleeping between full
    scans (which we do).  Limiting the page queue scan rate on a
    page-by-page basis does not scale.  Sleeping in between full queue
    scans (in an extreme case) does scale.

						-Matt

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