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| author | Philipp Reisner <philipp.reisner@linbit.com> | 2010-11-09 13:59:41 +0100 |
|---|---|---|
| committer | Philipp Reisner <philipp.reisner@linbit.com> | 2011-03-10 11:34:56 +0100 |
| commit | f91ab6282df251d28aa4ad1bd85194ebe0a0115b (patch) | |
| tree | 1c696b201c9eaea365e8d80bb3956827a0a880e7 /drivers/block/drbd/drbd_req.h | |
| parent | 9d77a5fee9d2a1ea4cd9a841d27b107df5913b33 (diff) | |
| download | linux-stable-f91ab6282df251d28aa4ad1bd85194ebe0a0115b.tar.gz linux-stable-f91ab6282df251d28aa4ad1bd85194ebe0a0115b.tar.bz2 linux-stable-f91ab6282df251d28aa4ad1bd85194ebe0a0115b.zip | |
drbd: Implemented side-stepping in drbd_res_begin_io()
Before:
drbd_rs_begin_io() locked app-IO out of an RS extent, and
waited then until all previous app-IO in that area finished.
(But not only until the disk-IO was finished but until the
barrier/epoch ack came in for that == round trip time latency ++)
After:
As soon as a new app-IO waits wants to start new IO on that
RS extent, drbd_rs_begin_io() steps aside (clearing the
BME_NO_WRITES flag again). It retries after 100ms.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Diffstat (limited to 'drivers/block/drbd/drbd_req.h')
0 files changed, 0 insertions, 0 deletions