On Mon, 1 Sep 2008, John Birrell wrote:
For those people experiencing a performance degradation since the DTrace
import, please update your copy of
src/sys/cddl/compat/opensolaris/kern/opensolaris_kmem.c by either cvsup
of direct edit to remove "#define KMEM_DEBUG".
You only need to rebuild the opensolaris kernel module after this
change. The code is shared between ZFS and DTrace via the opensolaris
kernel module.
This is also the reason why you found it necessary to add KDB, DDB and
STACK to your kernel. After removing KMEM_DEBUG, you won't need those.
Please confirm that this solves the problem you have been seeing.
8 or so hours later and everything is good here.
One other suggestion, the "opensolaris" module that is now required for
zfs is not mentioned anywhere in UPDATING. Users of "MODULES_OVERRIDE"
will likely find themselves with a system that will not boot without
manual intervention, sometimes even requiring a live cd. A headsup or
warning would probably be appreciated by other zfs'ers.
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