Re: [Qemu-block] virtio-scsi and request splitting

[Paolo Bonzini]

On 01/06/2017 16:25, Peter Lieven wrote:
>>
>>      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?!

Yeah, I cannot do math apparently.  Someone needs to debug the guest and
see where the strange 504K limit comes from.

Paolo

> blockdev --getmaxsect /dev/sda reports 1024 though. However, for
> virtio-blk its also 1024, but here 1M requests work.