[ovs-dev] Datpath in openVswitch

Vivek Kumar (EPG) kvivek at juniper.net
Wed Nov 20 10:40:31 UTC 2013


Hi Ben and All,

I have couple of quires regarding OpenVswitch:

1) could you please confirm in OpenVswitch data flow to be @ kernel level or user level.
2)  As some document says that When the first packet of a flow comes to the datapath, the datapath transmit it to the userspace using netlink. Does the datapath buffer the packet? Or it is just buffered in userspace? 

3) Will this (first)packet traversing from kernel to user space and user space to kernel space affect the performance. 

4) It seems that datapath flow entry is 5 seconds time-out, then how soon is the facet time_out? Where can I find the code of time_out? Or can we change time out value.



Thanks in advance. 
Vivek






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