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drbd: allow resync requests to be larger than max_segment_size

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this should allow for better background resync performance.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Lars Ellenberg 2010-05-14 19:08:55 +02:00 committed by Philipp Reisner
parent 45bb912bd5
commit bb3d000cb9
1 changed files with 6 additions and 7 deletions
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13
drivers/block/drbd/drbd_worker.c
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@ -462,7 +462,7 @@ int w_make_resync_request(struct drbd_conf *mdev,
unsigned long bit; unsigned long bit;
sector_t sector; sector_t sector;
const sector_t capacity = drbd_get_capacity(mdev->this_bdev); const sector_t capacity = drbd_get_capacity(mdev->this_bdev);
int max_segment_size = queue_max_segment_size(mdev->rq_queue); int max_segment_size;
int number, i, size, pe, mx; int number, i, size, pe, mx;
int align, queued, sndbuf; int align, queued, sndbuf;
@ -488,6 +488,11 @@ int w_make_resync_request(struct drbd_conf *mdev,
return 1; return 1;
} }
/* starting with drbd 8.3.8, we can handle multi-bio EEs,
* if it should be necessary */
max_segment_size = mdev->agreed_pro_version < 94 ?
queue_max_segment_size(mdev->rq_queue) : DRBD_MAX_SEGMENT_SIZE;
mdev->c_sync_rate = calc_resync_rate(mdev); mdev->c_sync_rate = calc_resync_rate(mdev);
number = SLEEP_TIME * mdev->c_sync_rate / ((BM_BLOCK_SIZE / 1024) * HZ); number = SLEEP_TIME * mdev->c_sync_rate / ((BM_BLOCK_SIZE / 1024) * HZ);
pe = atomic_read(&mdev->rs_pending_cnt); pe = atomic_read(&mdev->rs_pending_cnt);
@ -552,12 +557,6 @@ next_sector:
* *
* Additionally always align bigger requests, in order to * Additionally always align bigger requests, in order to
* be prepared for all stripe sizes of software RAIDs. * be prepared for all stripe sizes of software RAIDs.
*
* we _do_ care about the agreed-upon q->max_segment_size
* here, as splitting up the requests on the other side is more
* difficult. the consequence is, that on lvm and md and other
* "indirect" devices, this is dead code, since
* q->max_segment_size will be PAGE_SIZE.
*/ */
align = 1; align = 1;
for (;;) { for (;;) {