Date: Mon, 01 Sep 2008 12:32:04 -0400 From: Yarema <yds@CoolRat.org> To: John Birrell <jb@what-creek.com> Cc: stable@freebsd.org Subject: Re: ZFS performance issues (solved?!) Message-ID: <48BC1904.2080503@CoolRat.org> In-Reply-To: <20080901021528.GB56694@what-creek.com> References: <20080901021528.GB56694@what-creek.com>
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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. Yes! Last night doing a csup would peg the Sys CPU usage at 100%. After rebuilding the opensolaris kernel module everything is back to normal. There's a csup running as I type this and the system is upwards of 90%Idle. Thanks, Yarema
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