Date: Sun, 19 Aug 2001 12:08:55 -0700 (PDT) From: Matt Dillon <dillon@earth.backplane.com> To: David Greenman <dg@root.com> Cc: hackers@freebsd.org, murray@freebsd.org, jkh@freebsd.org Subject: Re: Recommendation for minor KVM adjustments for the release Message-ID: <200108191908.f7JJ8t445840@earth.backplane.com> References: <200108181549.f7IFntw39740@earth.backplane.com> <20010818155924.D63814@nexus.root.com>
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:
:> There are two things I would like to commit for the release:
:>
:> - I would like to cap the SWAPMETA zone reservation to 70MB,
:> which allows us to manage a maximum of 29GB worth of swapped
:> out data.
:>
:> This is plenty and saves us 94MB of KVM which is roughly
:> equivalent to 30,000 nmbclusters/mbufs.
:
: It's seems really hard to justify even that much SWAPMETA. A more
:reasonable amount would be more like 20MB.
:
:> - I would like to cap the size of the buffer cache at 200MB,
:> giving us another 70MB or so of KVM which is equivalent to
:> another 30,000 or so nmbclusters.
:
: That also seems like overkill for the vast majority of systems.
:
:
:-DG
:
:David Greenman
It's not a 1:1 mapping. There is some sparseness to the way SWAPMETA
structures are used so 29GB worth of swap-meta supported VM may wind
up only being 15GB of actually-swapped-out-dat in reallity. It
depends very heavily on the applications being run.
-Matt
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