Hi, Please find below my replies inline. > -----Original Message----- > From: discuss [mailto:[email protected]] On Behalf Of ??? > Sent: Tuesday, November 10, 2015 6:06 AM > To: [email protected] > Subject: [ovs-discuss] Open vSwitch running on DPDK > > When Open vSwitch is running on DPDK, we know that the OVS is in > userspace. I read the source code and found that the userspace has a cache > like microflow. My question is that is there a version that also has megaflow > in userspace ? > > Yes, megaflows - i.e. wildcarded flows - are managed in User-Space. Megaflows are collected in the Classifier Table, while microflows are collected in the EMC table (= Exact Match Cache). So both tables are now running in User Space. You can find their implementations in OVS/lib/dpif-netdev.c. All the functions like 'emc_insert()', 'emc_lookup()', 'emc_..' refer to the microflow cache (EMC). Instead the functions like 'dpcls_insert()', 'dpcls_lookup()', 'dpcls_..' refer to the megaflow cache (Classifier). If you like to see how a packet gets processed and 'bounced' by one table up to the other, you could start from the function dp_netdev_process_rxq_port(). By following the function calls you will see the decoding, then the lookup against the EMC. If that fails there's will be a lookup against the Classifier. All these functions are in 'dpif-netdev.c'. Hope that helps. -------------------------------------------------------------- Intel Research and Development Ireland Limited Registered in Ireland Registered Office: Collinstown Industrial Park, Leixlip, County Kildare Registered Number: 308263
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