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| author | Kiyoshi Ueda <k-ueda@ct.jp.nec.com> | 2009-06-22 10:12:28 +0100 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2009-06-22 10:12:28 +0100 |
| commit | f392ba889b019602976082bfe7bf486c2594f85c (patch) | |
| tree | 962e8f354dfe3df2021476412be8d1bcec8a03d0 /drivers/md/Kconfig | |
| parent | fd5e033908b7b743b5650790f196761dd930f988 (diff) | |
| download | lwn-f392ba889b019602976082bfe7bf486c2594f85c.tar.gz lwn-f392ba889b019602976082bfe7bf486c2594f85c.zip | |
dm mpath: add service time load balancer
This patch adds a service time oriented dynamic load balancer,
dm-service-time, which selects the path with the shortest estimated
service time for the incoming I/O.
The service time is estimated by dividing the in-flight I/O size
by a performance value of each path.
The performance value can be given as a table argument at the table
loading time. If no performance value is given, all paths are
considered equal.
Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/Kconfig')
| -rw-r--r-- | drivers/md/Kconfig | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig index 3b311d273346..09f93fa68912 100644 --- a/drivers/md/Kconfig +++ b/drivers/md/Kconfig @@ -258,6 +258,16 @@ config DM_MULTIPATH_QL If unsure, say N. +config DM_MULTIPATH_ST + tristate "I/O Path Selector based on the service time" + depends on DM_MULTIPATH + ---help--- + This path selector is a dynamic load balancer which selects + the path expected to complete the incoming I/O in the shortest + time. + + If unsure, say N. + config DM_DELAY tristate "I/O delaying target (EXPERIMENTAL)" depends on BLK_DEV_DM && EXPERIMENTAL |