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Date:      Mon, 4 Nov 1996 23:19:10 -0500 (EST)
From:      "John S. Dyson" <toor@dyson.iquest.net>
To:        current@freebsd.org
Subject:   Please test the new contigmalloc
Message-ID:  <199611050419.XAA00188@dyson.iquest.net>

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This is to let you know that there is a new contigmalloc committed
tonight.  This new code increases dramatically the probability that
a sound driver or it's like can be loaded at bootup time after the
system starts, and on large systems might even be able to be
loaded sometime after bootup time.

Specifically, it is best to load the sound LKM *IMMEDIATELY* after
the mount of the root filesystem.  Also, there are still problems
on systems < 8MBytes with this new code, in that the driver might
not get enough memory in that case.  It appears that just after
the mount of root and swap space, the new contigmalloc will
succeed for a 64K allocation.  Perhaps it would be wise to
back-off to a smaller allocation upon an allocation failure.

In the case of failure, the major thing that still should
be done is that the buffer cache should probably be minimized.
Otherwise, this code does about as much as can be done given
the current architecture of page allocation.

John




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