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| author | Alexander Motin <mav@FreeBSD.org> | 2009-12-08 22:43:29 +0000 |
|---|---|---|
| committer | Alexander Motin <mav@FreeBSD.org> | 2009-12-08 22:43:29 +0000 |
| commit | 20cad71f005302cb7053a93aa50e7460f599e9d4 (patch) | |
| tree | 64070dc8d937de049cae2b404a85ea60f1d884a7 | |
| parent | 93eba8807ccb3eced9f62495d2079183a7145dba (diff) | |
| download | src-20cad71f005302cb7053a93aa50e7460f599e9d4.tar.gz src-20cad71f005302cb7053a93aa50e7460f599e9d4.zip | |
Change gmirror default balance algorithm from "split" to "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.
Reviewed by: pjd
Notes
Notes:
svn path=/head/; revision=200282
| -rw-r--r-- | sbin/geom/class/mirror/geom_mirror.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sbin/geom/class/mirror/geom_mirror.c b/sbin/geom/class/mirror/geom_mirror.c index 6ac4fb9a775a..cf15c60af9d3 100644 --- a/sbin/geom/class/mirror/geom_mirror.c +++ b/sbin/geom/class/mirror/geom_mirror.c @@ -44,7 +44,7 @@ __FBSDID("$FreeBSD$"); uint32_t lib_version = G_LIB_VERSION; uint32_t version = G_MIRROR_VERSION; -static char label_balance[] = "split", configure_balance[] = "none"; +static char label_balance[] = "load", configure_balance[] = "none"; static intmax_t label_slice = 4096, configure_slice = -1; static intmax_t insert_priority = 0, configure_priority = -1; |