From: Lars Ellenberg <lars.ellenb...@linbit.com>
Make sure we have at least 67 (> AL_UPDATES_PER_TRANSACTION)
al-extents available, and allow up to half of that to be
discarded in one bio.
Signed-off-by: Philipp Reisner <philipp.reis...@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenb...@linbit.com>
---
drivers/block/drbd/drbd_actlog.c | 2 +-
drivers/block/drbd/drbd_int.h | 8 ++++----
include/linux/drbd_limits.h | 3 +--
3 files changed, 6 insertions(+), 7 deletions(-)
diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c
index 10459a1..1664762 100644
--- a/drivers/block/drbd/drbd_actlog.c
+++ b/drivers/block/drbd/drbd_actlog.c
@@ -256,7 +256,7 @@ bool drbd_al_begin_io_fastpath(struct drbd_device *device,
struct drbd_interval
unsigned first = i->sector >> (AL_EXTENT_SHIFT-9);
unsigned last = i->size == 0 ? first : (i->sector + (i->size >> 9) - 1)
>> (AL_EXTENT_SHIFT-9);
- D_ASSERT(device, (unsigned)(last - first) <= 1);
+ D_ASSERT(device, first <= last);
D_ASSERT(device, atomic_read(&device->local_cnt) > 0);
/* FIXME figure out a fast path for bios crossing AL extent boundaries
*/
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index d818e7d..d82e531 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -1347,10 +1347,10 @@ struct bm_extent {
#define DRBD_MAX_SIZE_H80_PACKET (1U << 15) /* Header 80 only allows packets
up to 32KiB data */
#define DRBD_MAX_BIO_SIZE_P95 (1U << 17) /* Protocol 95 to 99 allows bios
up to 128KiB */
-/* For now, don't allow more than one activity log extent worth of data
- * to be discarded in one go. We may need to rework drbd_al_begin_io()
- * to allow for even larger discard ranges */
-#define DRBD_MAX_DISCARD_SIZE AL_EXTENT_SIZE
+/* For now, don't allow more than half of what we can "activate" in one
+ * activity log transaction to be discarded in one go. We may need to rework
+ * drbd_al_begin_io() to allow for even larger discard ranges */
+#define DRBD_MAX_DISCARD_SIZE (AL_UPDATES_PER_TRANSACTION/2*AL_EXTENT_SIZE)
#define DRBD_MAX_DISCARD_SECTORS (DRBD_MAX_DISCARD_SIZE >> 9)
extern int drbd_bm_init(struct drbd_device *device);
diff --git a/include/linux/drbd_limits.h b/include/linux/drbd_limits.h
index a351c40..ddac684 100644
--- a/include/linux/drbd_limits.h
+++ b/include/linux/drbd_limits.h
@@ -126,8 +126,7 @@
#define DRBD_RESYNC_RATE_DEF 250
#define DRBD_RESYNC_RATE_SCALE 'k' /* kilobytes */
- /* less than 7 would hit performance unnecessarily. */
-#define DRBD_AL_EXTENTS_MIN 7
+#define DRBD_AL_EXTENTS_MIN 67
/* we use u16 as "slot number", (u16)~0 is "FREE".
* If you use >= 292 kB on-disk ring buffer,
* this is the maximum you can use: */
--
2.7.4
