Date: Mon, 1 Sep 2008 05:48:34 -0500 (CDT) From: Wes Morgan <morganw@chemikals.org> To: John Birrell <jb@what-creek.com> Cc: stable@freebsd.org Subject: Re: ZFS performance issues (solved?!) Message-ID: <alpine.BSF.1.10.0809010539210.52681@ibyngvyr.purzvxnyf.bet> In-Reply-To: <20080901021528.GB56694@what-creek.com> References: <20080901021528.GB56694@what-creek.com>
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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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