Date: Thu, 3 Dec 2009 22:55:33 +0100 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: Alexander Motin <mav@FreeBSD.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org, Will Andrews <will@firepipe.net> Subject: Re: svn commit: r200086 - head/sys/geom/mirror Message-ID: <20091203215532.GA2066@garage.freebsd.pl> In-Reply-To: <200912032147.nB3Llph1027086@svn.freebsd.org> References: <200912032147.nB3Llph1027086@svn.freebsd.org>
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--bp/iNruPH9dso1Pn Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Dec 03, 2009 at 09:47:51PM +0000, Alexander Motin wrote: > Author: mav > Date: Thu Dec 3 21:47:51 2009 > New Revision: 200086 > URL: http://svn.freebsd.org/changeset/base/200086 >=20 > Log: > Change 'load' balancing mode algorithm: > - Instead of measuring last request execution time for each drive and > choosing one with smallest time, use averaged number of requests, runni= ng > on each drive. This information is more accurate and timely. It allows = to > distribute load between drives in more even and predictable way. > - For each drive track offset of the last submitted request. If new req= uest > offset matches previous one or close for some drive, prefer that drive. > It allows to significantly speedup simultaneous sequential reads. > =20 > PR: kern/113885 > Reviewed by: sobomax Hmm, Will send me improved patch few days ago related to this functionality. Could you guys compare the patches, select the best one and commit it (or both if they serve different purposes)? I'm pretty occupied currently and it will take probably few weeks before I can join the discussion. --=20 Pawel Jakub Dawidek http://www.wheel.pl pjd@FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am! --bp/iNruPH9dso1Pn Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.4 (FreeBSD) iD8DBQFLGDPUForvXbEpPzQRArWlAKCv330H/WHYcll/c3QMb1jlMIj06gCgo1J/ TUJc9O747V2BeV6/5NqeQ7k= =qt1X -----END PGP SIGNATURE----- --bp/iNruPH9dso1Pn--
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