hi:
I have found that when adding lots of ports, system consumes more and more
time when ports number increasing.
And the main time is consumed on encapsulation and decapsulation the JSON
message between vsctl and ovsdb-server.
when vsctl starts, it will first send monitor request to ovsdb-server, and
then db-server send all the records with the related column to vsctl
please notice the word "all records", so that when ports number gets larger,
system will need more time to encap and decap the JSON message between vsctl
and db-server.
I suggest to slightly modify the RPC method "Monitor" in RFC 7047. The main
idea is only monitor specified records when add /del/set/get port.
The original Monitor method is like that:
Each <monitor-request> is an object with the following members:
"columns": [<column>*] optional
"select": <monitor-select> optional
The columns, if present, define the columns within the table to be
monitored. <monitor-select> is an object with the following members:
"initial": <boolean> optional
"insert": <boolean> optional
"delete": <boolean> optional
"modify": <boolean> optional
And I want give this method a slight change:
<monitor-select> is an object with the following members:
"initial": <boolean> optional
"insert": <boolean> optional
"delete": <boolean> optional
"modify": <boolean> optional
"where": [<condition>*] optional
for example, when add or del a port p0, first we will send a monitor request
like this:
method="monitor",
params=["Open_vSwitch",null,{"Port":{"columns":["bridges","fake_bridge","interfaces","name","tag"],"select":{"where":[["name","==","p0"]]}},"Interface":{"columns":["name","ofport","type"],"select":{"where":[["name","==","p0"]]}},"Bridge":{"columns":["controller","fail_mode","name"],"select":{"where":[["name","==","br0"]]}},"Controller":{"columns":[]},"Open_vSwitch":{"columns":["bridges","cur_cfg"]}}]
then ovsdb-server should only reply with the specified record p0, so that we
can save lots of time when monitoring.
I have done a test with this method, with 4000 ports, the time consuming can be
decreased from about 2800s to about 500s.
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