Date: Fri, 11 Dec 2009 00:00:18 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sbin/geom/class/mirror geom_mirror.c gmirror.8 Message-ID: <200912110000.nBB00YVb077458@repoman.freebsd.org>
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mav 2009-12-11 00:00:18 UTC
FreeBSD src repository
Modified files: (Branch: RELENG_7)
sbin/geom/class/mirror geom_mirror.c gmirror.8
Log:
SVN rev 200374 on 2009-12-11 00:00:18Z by mav
MFC r200282, r200290:
Change gmirror default balance algorithm from "split" to improved "load".
"split" is very ineffective for devices with rotating media as HDDs.
To be effective, it needs that transfer time reduction due to block
splitting was bigger then access time increase due to non-sequential
access. For modern HDDs I was able to reproduce it only with read sizes
of 2MB and above, which is almost not applicable in real life.
"load" algorithm same time is more universal and effective now.
Revision Changes Path
1.17.2.1 +1 -1 src/sbin/geom/class/mirror/geom_mirror.c
1.23.2.1 +1 -1 src/sbin/geom/class/mirror/gmirror.8
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