drbd: don't let application IO pre-empt resync too often

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Before, application IO could pre-empt resync activity
for up to hardcoded 20 seconds per resync request.
A very busy server could throttle the effective resync bandwidth
down to one request per 20 seconds.

Now, we only let application IO pre-empt resync traffic
while the current resync rate estimate is above c-min-rate.

If you disable the c-min-rate throttle feature (set c-min-rate = 0),
application IO will no longer pre-empt resync traffic at all.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

...

This commit is contained in:

Lars Ellenberg 2014-04-28 18:43:19 +02:00 • committed by Jens Axboe

parent 0e49d7b014

commit e829987433

3 changed files with 34 additions and 29 deletions

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13

drivers/block/drbd/drbd_actlog.c

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3

drivers/block/drbd/drbd_int.h

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47

drivers/block/drbd/drbd_receiver.c

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