Hi All, Also is there any command or method in OVS to measure congestion ? i.e., when the link load is greater than the link capacity, how could I know ?
Best, Jiaqi On Wed, Feb 3, 2016 at 12:38 PM, Flavio Leitner <f...@sysclose.org> wrote: > On Tue, 2 Feb 2016 15:44:50 -0500 > Jiaqi Zheng <jiaqi...@gmail.com> wrote: > > > According to my understanding, switch should have a input queue for > > each input port, and output queue for each output port. Is it right ? > > When a packet is received by a netdev device, it is identified as part > of OVS and pushed for data path processing and in the end the actions > are executed. If the action is to send out in a port, that happens > immediately. The device transmitting the packet might queue in the > qdisc. Look at ovs_vport_output() -> ovs_vport_send() -> > send() = dev_queue_xmit(). Here the it gets into qdisc [tc(8)]. > > That queue is outside of OVS and after that the packet hits the wire. > > You could tune the NIC increasing the number of receiving buffers > available [ethtool(8) -g]. Usually NICs can do 4k, but the default is > 256 buffers. > > -- > fbl > > > > > > On Tue, Feb 2, 2016 at 3:43 PM, Ben Pfaff <b...@ovn.org> wrote: > > > > > Which input and output queues? > > > > > > On Tue, Feb 02, 2016 at 03:41:48PM -0500, Jiaqi Zheng wrote: > > > > You mean input queue and output queue? OVS can configure which ? > > > > > > > > Best, > > > > Jiaqi > > > > > > > > On Tue, Feb 2, 2016 at 3:39 PM, Ben Pfaff <b...@ovn.org> wrote: > > > > > > > > > On Tue, Feb 02, 2016 at 03:24:57PM -0500, Jiaqi Zheng wrote: > > > > > > Is there any command to set switch queue size ? i.e. buffer > > > > > > size. > > > Larger > > > > > > queue size can accommodate more packets when congestion > > > > > > occurs. > > > > > > > > > > Which queues are you talking about? > > > > > > > > > >
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