On 12/12/2017 16:16, Denis V. Lunev wrote:
> The dark side of this patch is that we are tweaking guest visible
> parameter, though this should be relatively safe as above transport
> layer support is present in QEMU/host Linux for a very long time.
> The patch adds configurable property for VirtIO
Linux guests submit IO requests no longer than PAGE_SIZE * max_seg
field reported by SCSI controler. Thus typical sequential read with
1 MB size results in the following pattern of the IO from the guest:
8,16 115754 2.766095122 2071 D R 2095104 + 1008 [dd]
8,16 115755 2.
