Am 01.06.2017 um 16:21 schrieb Paolo Bonzini:
On 01/06/2017 16:11, Peter Lieven wrote:
Where shall I send the traces?
The output for the dd phase looks sth like this. Is this correct?
virtqueue_alloc_element 30498.707 pid=28286 elem=0x560dcca24200 sz=0xf0
in_num=0x1 out_num=0x36
virtqueue_alloc_element 7.558 pid=28286 elem=0x560dcca22680 sz=0xf0 in_num=0x1
out_num=0x1a
virtqueue_alloc_element 1.410 pid=28286 elem=0x560dcdf916c0 sz=0xf0 in_num=0x1
out_num=0x2
Yeah, I guess this is enough. This is it:
DEFINE_PROP_UINT32("max_sectors", VirtIOSCSI,
parent_obj.conf.max_sectors,
0xFFFF),
We could increase it now that we have support for max_xfer_len passthrough.
0xFFFF * 512 is 32MB - 512 byte. This should not limit 1M requests?!
blockdev --getmaxsect /dev/sda reports 1024 though. However, for virtio-blk its
also 1024, but here 1M requests work.
Peter
