[Spice-devel] [PATCH spice-protocol 2/2] Add qos related messages

[Yonit Halperin]

On 04/10/2012 12:13 PM, Marc-André Lureau wrote:
> On Sun, Apr 8, 2012 at 5:42 PM, Yonit Halperin<yhalperi at redhat.com>  wrote:
>> If the client's channel has SPICE_COMMON_CAP_QOS_QUERY,
>> the server's channel can send SPICE_MSG_QOS_QUERY to the client.
>> In response, the client is expected to send back SPICE_MSG_QOS_ACK
>> immediately after it receives the message following the query, and
>> before handling the message. The server can deduce
>> the network condition using the ack arrival time.
>
> Can it deduce other things than latency with this query?
>
You can deduce the bit rate, the ack is expected  only after receiving 
the message following the QOS_QUERY. So you can send the QOS_QUERY just 
before you are about to send a large message.