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Do not overwrite same journal sector multiple times

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It doesn't reduce actual WA, but it reduces tail latency (Q=32, 10% / 50% / 90% / 99% / 99.95%):
- write: 766us/979us/1090us/1303us/1729us vs 1074us/1450us/2212us/3261us/4113us
- sync: 701us/881us/1188us/1762us/2540us vs 269us/955us/1663us/2638us/4146us
This commit is contained in:
Vitaliy Filippov
2020-01-15 02:53:01 +03:00
parent 111516381f
commit a3d3949dce
7 changed files with 163 additions and 91 deletions
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blockstore_impl.h
+2
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@@ -256,6 +256,8 @@ class blockstore_impl_t
void enqueue_write(blockstore_op_t *op);
int dequeue_write(blockstore_op_t *op);
int dequeue_del(blockstore_op_t *op);
void ack_write(blockstore_op_t *op);
void release_journal_sectors(blockstore_op_t *op);
void handle_write_event(ring_data_t *data, blockstore_op_t *op);
// Sync