virtio-blk: use larger default request size

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 <kraxel@redhat.com>
1 file changed
tree: de2bcc92ba54ece25473ca2df83b42b6bd89c5a1
  1. docs/
  2. scripts/
  3. src/
  4. vgasrc/
  5. .gitignore
  6. COPYING
  7. COPYING.LESSER
  8. Makefile
  9. README