On Wed, Sep 16, 2015 at 12:35:46PM +0800, Na Zhu wrote: > Think about this case: a VM attaches to an OVS br-int through > vhost(kernel), the OVS br-int interconnects with OVS br-eth through a pair > of patch ports. The physical NIC eth0 is added to br-eth. A packet > originated from the VM is eventually sent out form eth0. When the data path > of OVS br-int forwards the packet from the TAP (associates with the VM) > interface to the patch port, if the OVS patch port is implemented entirely > inside OVS user space, in this case will it get performance penalty, since > a switching from kernel space to user space seems to take place?
No. Patch ports do not require an extra trip through userspace. _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev
