We are using OVS for our VDI solution based Citrix Xenserver to provide 15000 virtual desktop.
Recently, we have built a script to monitor the size of OVS flow table. We found the number of flow entries in flow table jumps up and down between 1500 and 7000 in one heavily used OVS. So we want to understand more about the flow table. I have been told the following: "ovs-vswitchd determines how long the flow should stay in the kernel flow table. By default, it expires a flow after five seconds of inactivity. It can be more aggressive if the flow table becomes large." I'd like to know more details about "It can be more aggressive if the flow table becomes large (Are 7000 flows considered as large?)."? In addition, 2 more questions: (1) Does OVS empty and recreate the kernal flow table at some stage? (2) Can the default flow expire timeout be changed? Like increase to 5mins Your help is highly appreciated.
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