drbd: New sync parameters for the smart resync rate controller

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

4 files changed, 25 insertions, 13 deletions

diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 410d3d4f361e..5a484c1f5ce7 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -2690,7 +2690,11 @@ static void drbd_set_defaults(struct drbd_conf *mdev)
                 /* .cpu_mask = */       {}, 0,
                 /* .csums_alg = */      {}, 0,
                 /* .use_rle = */        0,
-                /* .on_no_data = */     DRBD_ON_NO_DATA_DEF
+                /* .on_no_data = */     DRBD_ON_NO_DATA_DEF,
+                /* .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
         };
 
         /* Have to use that way, because the layout differs between
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 6c08e637e25c..7d384fd39c16 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -1599,6 +1599,10 @@ static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *n
                 sc.after      = DRBD_AFTER_DEF;
                 sc.al_extents = DRBD_AL_EXTENTS_DEF;
                 sc.on_no_data  = DRBD_ON_NO_DATA_DEF;
+                sc.c_plan_ahead = DRBD_C_PLAN_AHEAD_DEF;
+                sc.c_delay_target = DRBD_C_DELAY_TARGET_DEF;
+                sc.c_fill_target = DRBD_C_FILL_TARGET_DEF;
+                sc.c_max_rate   = DRBD_C_MAX_RATE_DEF;
         } else
                 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf));
 
diff --git a/include/linux/drbd_limits.h b/include/linux/drbd_limits.h
index 7eb1e98009ec..06dbba47a8ef 100644
--- a/include/linux/drbd_limits.h
+++ b/include/linux/drbd_limits.h
@@ -134,21 +134,21 @@
 #define DRBD_MAX_BIO_BVECS_MAX 128
 #define DRBD_MAX_BIO_BVECS_DEF 0
 
-#define DRBD_DP_VOLUME_MIN 4
-#define DRBD_DP_VOLUME_MAX 1048576
-#define DRBD_DP_VOLUME_DEF 16384
+#define DRBD_C_PLAN_AHEAD_MIN  0
+#define DRBD_C_PLAN_AHEAD_MAX  300
+#define DRBD_C_PLAN_AHEAD_DEF  0 /* RS rate controller disabled by default */
 
-#define DRBD_DP_INTERVAL_MIN 1
-#define DRBD_DP_INTERVAL_MAX 600
-#define DRBD_DP_INTERVAL_DEF 5
+#define DRBD_C_DELAY_TARGET_MIN 1
+#define DRBD_C_DELAY_TARGET_MAX 100
+#define DRBD_C_DELAY_TARGET_DEF 10
 
-#define DRBD_RS_THROTTLE_TH_MIN 1
-#define DRBD_RS_THROTTLE_TH_MAX 600
-#define DRBD_RS_THROTTLE_TH_DEF 20
+#define DRBD_C_FILL_TARGET_MIN 0
+#define DRBD_C_FILL_TARGET_MAX 100000
+#define DRBD_C_FILL_TARGET_DEF 0 /* By default disabled -> controlled by delay_target */
 
-#define DRBD_RS_HOLD_OFF_TH_MIN 1
-#define DRBD_RS_HOLD_OFF_TH_MAX 6000
-#define DRBD_RS_HOLD_OFF_TH_DEF 100
+#define DRBD_C_MAX_RATE_MIN     250 /* kByte/sec */
+#define DRBD_C_MAX_RATE_MAX     (4 << 20)
+#define DRBD_C_MAX_RATE_DEF     102400
 
 #undef RANGE
 #endif
diff --git a/include/linux/drbd_nl.h b/include/linux/drbd_nl.h
index 9aebd0d80a5d..e23683c87ca1 100644
--- a/include/linux/drbd_nl.h
+++ b/include/linux/drbd_nl.h
@@ -88,6 +88,10 @@ NL_PACKET(syncer_conf, 8,
         NL_STRING(      64,     T_MAY_IGNORE,   csums_alg,      SHARED_SECRET_MAX)
         NL_BIT(         65,     T_MAY_IGNORE,   use_rle)
         NL_INTEGER(     75,     T_MAY_IGNORE,   on_no_data)
+        NL_INTEGER(     76,     T_MAY_IGNORE,   c_plan_ahead)
+        NL_INTEGER(     77,     T_MAY_IGNORE,   c_delay_target)
+        NL_INTEGER(     78,     T_MAY_IGNORE,   c_fill_target)
+        NL_INTEGER(     79,     T_MAY_IGNORE,   c_max_rate)
 )
 
 NL_PACKET(invalidate, 9, )