drbd: new configuration parameter c-min-rate
We now track the data rate of locally submitted resync related requests,
and can thus detect non-resync activity on the lower level device.
If the current sync rate is above c-min-rate, and the lower level device
appears to be busy, we throttle the resyncer.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 1ff8418a..db93eee 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -1098,6 +1098,8 @@
mdev->ov_left = mdev->rs_total
- BM_SECT_TO_BIT(mdev->ov_position);
mdev->rs_start = now;
+ mdev->rs_last_events = 0;
+ mdev->rs_last_sect_ev = 0;
mdev->ov_last_oos_size = 0;
mdev->ov_last_oos_start = 0;
@@ -2706,7 +2708,8 @@
/* .c_plan_ahead = */ DRBD_C_PLAN_AHEAD_DEF,
/* .c_delay_target = */ DRBD_C_DELAY_TARGET_DEF,
/* .c_fill_target = */ DRBD_C_FILL_TARGET_DEF,
- /* .c_max_rate = */ DRBD_C_MAX_RATE_DEF
+ /* .c_max_rate = */ DRBD_C_MAX_RATE_DEF,
+ /* .c_min_rate = */ DRBD_C_MIN_RATE_DEF
};
/* Have to use that way, because the layout differs between
@@ -2742,6 +2745,7 @@
atomic_set(&mdev->packet_seq, 0);
atomic_set(&mdev->pp_in_use, 0);
atomic_set(&mdev->rs_sect_in, 0);
+ atomic_set(&mdev->rs_sect_ev, 0);
mutex_init(&mdev->md_io_mutex);
mutex_init(&mdev->data.mutex);
@@ -2819,6 +2823,7 @@
mdev->rs_total =
mdev->rs_failed = 0;
mdev->rs_last_events = 0;
+ mdev->rs_last_sect_ev = 0;
for (i = 0; i < DRBD_SYNC_MARKS; i++) {
mdev->rs_mark_left[i] = 0;
mdev->rs_mark_time[i] = 0;
