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>

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

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));
 

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

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, )