[Qemu-devel] [PATCH 23/23] block migration: Increase dirty chunk size to 1M

[Jan Kiszka]

4K is too small for efficiently saving and restoring multi-GB block
devices.

Signed-off-by: Jan Kiszka <address@hidden>
---

 block.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/block.h b/block.h
index 3513712..4a8b628 100644
--- a/block.h
+++ b/block.h
@@ -192,7 +192,7 @@ int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t 
*buf,
 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
                       int64_t pos, int size);
 
-#define BDRV_SECTORS_PER_DIRTY_CHUNK 8
+#define BDRV_SECTORS_PER_DIRTY_CHUNK 2048
 
 void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable);
 int bdrv_get_dirty(BlockDriverState *bs, int64_t sector);