Bump default from 8 to 64 blocks. Using 8 by default leads
to requests being splitted on qemu, which slows down boot.
Some (temporary) debug logging added showed that almost all
requests on a standard fedora install are less than 64 blocks,
so that should bring us back to 1.15 performance levels.
Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
---
src/hw/virtio-blk.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/hw/virtio-blk.c b/src/hw/virtio-blk.c
index 929ba8873dc0..9b4a05a4c424 100644
--- a/src/hw/virtio-blk.c
+++ b/src/hw/virtio-blk.c
@@ -95,7 +95,7 @@ virtio_blk_op(struct disk_op_s *op, int write)
blk_num_max = (u16)max_io_size / vdrive->drive.blksize;
else
/* default blk_num_max if hardware doesnot advise a proper value */
- blk_num_max = 8;
+ blk_num_max = 64;
if (op->count <= blk_num_max) {
virtio_blk_op_one_segment(vdrive, write, sg);
--
2.36.1
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