From owner-freebsd-fs@FreeBSD.ORG  Sat Dec 15 16:43:45 2012
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Date: Sat, 15 Dec 2012 17:43:36 +0100
From: Tom <freebsdlists@bsdunix.ch>
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Subject: zfs: is it possible to set metaslab_debug to 1?
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Hi,

Is it possible to set metaslab_debug to 1 on freebsd without recompiling:
usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/metaslab.c

/*
 * Metaslab debugging: when set, keeps all space maps in core to verify
frees.
 */
static int metaslab_debug = 0;

Is this even possible on FreeBSD? It often helps with ZFS perfomance
issues on Solaris with lots of ram.

Regards,
Tom