drbd: Implemented side-stepping in drbd_res_begin_io()

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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>

...

This commit is contained in:

Philipp Reisner 2010-11-09 13:59:41 +01:00

parent 9d77a5fee9

commit f91ab6282d

1 changed files with 19 additions and 5 deletions

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24

drivers/block/drbd/drbd_actlog.c

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