Re: [Qemu-devel] [virtio-dev] Re: [virtio-dev] Re: [virtio-dev] Re: [PATCH v1] virtio-net: enable configurable tx queue size

[Wei Wang <wei.w.wang@intel.com>]

On 06/19/2017 03:46 AM, Michael S. Tsirkin wrote:
>>>>
>>>> What do you have in mind about the protocol flag?
>>> Merely this: older clients might be confused if they get
>>> a s/g with 1024 entries.
>> I don't disagree to add that. But the client (i.e. vhost-user
>> slave) is a host userspace program, and it seems that users can
>> easily patch their host side applications if there is any issue,
>> maybe we also don't need to be too prudent about that, do we?
> I won't insist on this but it might not be easy. For example, are there
> clients that want to forward the packet to host kernel as a s/g?

Not sure about all the client implementation, but it sounds like a
strange and inefficient usage of vhost-user to pass packets to
the host kernel, given vhost kernel backend is already there
for the usage.

Best,
Wei