Hello Ben, thank you for help! as Open vSwitch stores only 256 Packet_Ins in buffer (OFPT_FEATURES_REPLY: n_buffers = 256) after 256 packets it sets Buffer_ID to 0xffffffff. Controller didn't check this value as incorrect and placed it into responses in flow_mods and packet_outs, that caused packet drops after approximately 300 packet_in in a burst.
BTW, setting miss_send_len = 65535 forces switch to send complete Packet_In to Controller but switch still stores packets in buffer and adds valid buffer_id for first 255 of them. Is it possible to turn off buffering in switch (and to set buffer_id = -1 for all packets) using OpenFlow 1.0? (In OpenFlow 1.2+ it should be possible by setting OFPCML_NO_BUFFER as I understood). Is it possible to vary the size of buffer for Packet_In in Open vSwitch? -- Best regards, Anton Matsiuk On 22 November 2013 18:52, Ben Pfaff <b...@nicira.com> wrote: > On Fri, Nov 22, 2013 at 05:30:47PM +0100, Anton Matsiuk wrote: > > > > > > Does the controller get any error replies from Open vSwitch? > > > > > > No, Open vSwitch just accepts all the rules (500) and installs them > without > > sending any errors to a controller, but processes only part of ingress > > packets through them: > > ovs-ofctl dump-aggregate br0 > > NXST_AGGREGATE reply (xid=0x4): packet_count=324 byte_count=20736 > > flow_count=500 > > OK, thanks for the details. > > Are the switch and the controller using buffered packets? That is, is > the controller sending 500 flow_mods and 500 packet_outs, or is it > just sending 500 flow_mods? If it is sending only flow_mods, can you > try disabling packet buffering in the switch? (One way to do this is > to have the controller set a miss_send_len of 65535.) >
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