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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/dm-table.c | |
| parent | dm mpath: add queue length load balancer (diff) | |
| download | linux-dev-f392ba889b019602976082bfe7bf486c2594f85c.tar.xz linux-dev-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/dm-table.c')
0 files changed, 0 insertions, 0 deletions