From e82998743385ca861b9ec919eb2ba8177ce72180 Mon Sep 17 00:00:00 2001 From: Lars Ellenberg Date: Mon, 28 Apr 2014 18:43:19 +0200 Subject: drbd: don't let application IO pre-empt resync too often 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 Signed-off-by: Lars Ellenberg Signed-off-by: Jens Axboe --- drivers/block/drbd/drbd_int.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/block/drbd/drbd_int.h') diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h index 361a2e9cd727..f0cabea5cda2 100644 --- a/drivers/block/drbd/drbd_int.h +++ b/drivers/block/drbd/drbd_int.h @@ -1339,7 +1339,8 @@ extern void start_resync_timer_fn(unsigned long data); /* drbd_receiver.c */ extern int drbd_receiver(struct drbd_thread *thi); extern int drbd_asender(struct drbd_thread *thi); -extern int drbd_rs_should_slow_down(struct drbd_device *device, sector_t sector); +extern bool drbd_rs_c_min_rate_throttle(struct drbd_device *device); +extern bool drbd_rs_should_slow_down(struct drbd_device *device, sector_t sector); extern int drbd_submit_peer_request(struct drbd_device *, struct drbd_peer_request *, const unsigned, const int); -- cgit v1.2.3