Date: Sun, 25 Nov 2012 17:39:24 +0100 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: Martin Matuska <mm@FreeBSD.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r243524 - in head: cddl/contrib/opensolaris/cmd/ztest sys/cddl/contrib/opensolaris/uts/common/fs/zfs sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys Message-ID: <20121125163924.GM1460@garage.freebsd.pl> In-Reply-To: <201211251632.qAPGW8wd091581@svn.freebsd.org> References: <201211251632.qAPGW8wd091581@svn.freebsd.org>
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--q8dntDJTu318bll0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sun, Nov 25, 2012 at 04:32:08PM +0000, Martin Matuska wrote: > Author: mm > Date: Sun Nov 25 16:32:07 2012 > New Revision: 243524 > URL: http://svnweb.freebsd.org/changeset/base/243524 >=20 > Log: > MFV r243013 and r243267: > =20 > Import the zio nop-write improvement from Illumos. To reduce I/O, > nop-write omits overwriting data if the checksum (cryptographically > secure) of new data matches the checksum of existing data. > It also saves space if snapshots are in use. > =20 > It currently works only on datasets with enabled compression, disabled > deduplication and sha256 checksums. > =20 > IllumOS 13887:196932ec9e6a and 13888:7204b3392a58 > 3236 zio nop-write This is a nice change, although I don't understand why it depends on compression being turned on. It won't save any space. --=20 Pawel Jakub Dawidek http://www.wheelsystems.com FreeBSD committer http://www.FreeBSD.org Am I Evil? Yes, I Am! http://tupytaj.pl --q8dntDJTu318bll0 Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) iEYEARECAAYFAlCySbwACgkQForvXbEpPzTDXACg5iK922TMvB73fZJlZRjU1rOD tewAmgPjLCQacxqbnHko4RdbbSpVVDsH =9MAh -----END PGP SIGNATURE----- --q8dntDJTu318bll0--
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