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Subject[PATCH 03/11] drbd: Changed some defaults
Date
* Enabled the resync controller, with a fill target of 50Kib. That gives
reasonable resync speeds without tuning. A much better default than
the 250KiB/s fixed.

* Enable bitmap compression. It is save to use, and most people have
more CPU power than network bandwidth.

* ko-count of 7: Abort a connection if the peer fails to process a
write request within 42 seconds.

* al-extents of 1237: ~5 GiB seems to be a much more sane default
these days.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
---
include/linux/drbd_limits.h | 14 +++++++-------
1 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/include/linux/drbd_limits.h b/include/linux/drbd_limits.h
index 425010a..3fc554b 100644
--- a/include/linux/drbd_limits.h
+++ b/include/linux/drbd_limits.h
@@ -16,7 +16,7 @@
#define DEBUG_RANGE_CHECK 0

#define DRBD_MINOR_COUNT_MIN 1
-#define DRBD_MINOR_COUNT_MAX 256
+#define DRBD_MINOR_COUNT_MAX (1U << 20)
#define DRBD_MINOR_COUNT_DEF 32

#define DRBD_VOLUME_MAX 65535
@@ -99,7 +99,7 @@
* 200 should be more than enough even for very short timeouts */
#define DRBD_KO_COUNT_MIN 0
#define DRBD_KO_COUNT_MAX 200
-#define DRBD_KO_COUNT_DEF 0
+#define DRBD_KO_COUNT_DEF 7
/* } */

/* syncer { */
@@ -117,7 +117,7 @@
* 919 * 7 = 6433 */
#define DRBD_AL_EXTENTS_MIN 7
#define DRBD_AL_EXTENTS_MAX 6433
-#define DRBD_AL_EXTENTS_DEF 127
+#define DRBD_AL_EXTENTS_DEF 1237

#define DRBD_MINOR_NUMBER_MIN -1
#define DRBD_MINOR_NUMBER_MAX (1<<30)
@@ -151,7 +151,7 @@

#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_C_PLAN_AHEAD_DEF 20

#define DRBD_C_DELAY_TARGET_MIN 1
#define DRBD_C_DELAY_TARGET_MAX 100
@@ -159,7 +159,7 @@

#define DRBD_C_FILL_TARGET_MIN 0
#define DRBD_C_FILL_TARGET_MAX (1<<20) /* 500MByte in sec */
-#define DRBD_C_FILL_TARGET_DEF 0 /* By default disabled -> controlled by delay_target */
+#define DRBD_C_FILL_TARGET_DEF 100 /* Try to place 50KiB in socket send buffer during resync */

#define DRBD_C_MAX_RATE_MIN 250 /* kByte/sec */
#define DRBD_C_MAX_RATE_MAX (4 << 20)
@@ -167,7 +167,7 @@

#define DRBD_C_MIN_RATE_MIN 0 /* kByte/sec */
#define DRBD_C_MIN_RATE_MAX (4 << 20)
-#define DRBD_C_MIN_RATE_DEF 4096
+#define DRBD_C_MIN_RATE_DEF 250

#define DRBD_CONG_FILL_MIN 0
#define DRBD_CONG_FILL_MAX (10<<21) /* 10GByte in sectors */
@@ -187,6 +187,6 @@

#define DRBD_ALLOW_TWO_PRIMARIES_DEF 0
#define DRBD_ALWAYS_ASBP_DEF 0
-#define DRBD_USE_RLE_DEF 0
+#define DRBD_USE_RLE_DEF 1

#endif
--
1.7.4.1


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