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Subject: Re: svn commit: r254544 - head/sys/vm
From: Scott Long <scott4long@yahoo.com>
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Date: Mon, 19 Aug 2013 22:44:23 -0600
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To: Jeff Roberson <jeff@FreeBSD.org>
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On Aug 19, 2013, at 5:54 PM, Jeff Roberson <jeff@FreeBSD.org> wrote:

> Author: jeff
> Date: Mon Aug 19 23:54:24 2013
> New Revision: 254544
> URL: http://svnweb.freebsd.org/changeset/base/254544
>=20
> Log:
>   - Increase the active lru refresh interval to 10 minutes.  This has =
been
>     shown to negatively impact some workloads and the goal is only to
>     eliminate worst case behaviors for very long periods of paging
>     inactivity.  Eventually we should determine a more complex scaling
>     factor for this feature.
>   - Rate limit low memory callback handlers to limit thrashing.  Set =
the
>     default to 10 seconds.

A more primitive version of this was tested at Netflix and found to be =
very advantageous.  Thanks for turning it into a more polished thing.

Scott