From: Lidong Chen <jemmy858...@gmail.com>
Increase bmds->cur_dirty after submit io, so reduce the frequency
involve into blk_drain, and improve the performance obviously
when block migration.
The performance test result of this patch:
During the block dirty save phase, this patch improve guest os IOPS
from 4.0K to 9.5K. and improve the migration speed from
505856 rsec/s to 855756 rsec/s.
Signed-off-by: Lidong Chen <jemmy858...@gmail.com>
Reviewed-by: Fam Zheng <f...@redhat.com>
Signed-off-by: Juan Quintela <quint...@redhat.com>
---
migration/block.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/migration/block.c b/migration/block.c
index 6741228..7734ff7 100644
--- a/migration/block.c
+++ b/migration/block.c
@@ -576,6 +576,9 @@ static int mig_save_device_dirty(QEMUFile *f,
BlkMigDevState *bmds,
}
bdrv_reset_dirty_bitmap(bmds->dirty_bitmap, sector, nr_sectors);
+ sector += nr_sectors;
+ bmds->cur_dirty = sector;
+
break;
}
sector += BDRV_SECTORS_PER_DIRTY_CHUNK;
--
2.9.3
