svn commit: r205231 - in head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs: . sys

[Pawel Jakub Dawidek]

On Sat, Mar 20, 2010 at 12:02:19PM +0100, Pawel Jakub Dawidek wrote:
> On Tue, Mar 16, 2010 at 10:17:22PM +0000, Kip Macy wrote:
> > Author: kmacy
> > Date: Tue Mar 16 22:17:21 2010
> > New Revision: 205231
> > URL: http://svn.freebsd.org/changeset/base/205231
> > 
> > Log:
> >   - reduce contention by breaking up ARC state locks in to 16 for data
> >     and 16 for metadata
> >   - export L2ARC tunables as sysctls
> >   - add several kstats to track L2ARC state more precisely
> >   - avoid holding a contended lock when atomically incrementing a
> >     contended counter (no lock protection needed for atomics)
> 
> Kip, don't get me wrong, I appreciate you're working on ZFS, but...
> 
> I'm still working on ZFS, trying hard to bring it up-to-date and such
> invasive changes don't make it easier.
> 
> I'm not against invasive changes in general, but I want them to be
> reviewed and tested properly. We discussed this multiple times and I
> thought the consensus was to provide hard number and workload examples
> that will prove the change really helps. And if it helps, present the
> finding to Sun/Oracle guys to get the changes into OpenSolaris, which is
> good for everyone: OpenSolaris gets faster ZFS, FreeBSD gets less pain
> in keeping ZFS up-to-date.
> 
> Can I ask you to prepare description of the workload it helps, benchmark
> it and present the numbers on zfs-code at opensolaris.org?
> 
> The ZFS team is built from really smart and mature developers. I'm sure
> that if the change is properly described with prove included they will
> accept it and the world will be a bit better place to live for everyone.

Take a look at:

	http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6581122

-- 
Pawel Jakub Dawidek                       http://www.wheelsystems.com
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!
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