Thanks, Joe. Turns out that the model switch used (P-3290) does not support the mod_ip_dst action in hardware, and therefore forwards all packets matching the flow from asic to CPU, causing a “packet-list overflow” as logged in /tmp/log/messages.
Kind regards, Damiaan Twelker > On 14 Apr 2016, at 01:32, Joe Stringer <j...@ovn.org> wrote: > > On 13 April 2016 at 08:33, Damiaan Twelker > <damiaan.twel...@student.uva.nl <mailto:damiaan.twel...@student.uva.nl>> > wrote: >> Hi, >> >> I have set up a bridge with 3 physical ports (vlan_mode=access). The >> following rules are active in order to redirect data sent from 10.0.0.1 >> destined for 10.0.0.2 to 10.0.0.3: >> >> cookie=0x0, duration=2725.863s, table=0, n_packets=n/a, n_bytes=33572528154, >> ip,in_port=25,nw_dst=10.0.0.2 >> actions=set_field:10.0.0.3->ip_dst,set_field:96:5f:91:02:cf:3f->eth_dst,output:27 >> cookie=0x0, duration=2670.657s, table=0, n_packets=n/a, n_bytes=48832, >> arp,in_port=26 actions=output:25 >> cookie=0x0, duration=2680.799s, table=0, n_packets=n/a, n_bytes=4672, >> arp,in_port=25 actions=output:26 >> >> 10.0.0.1 is connected to port 25, 10.0.0.2 to port 26, 10.0.0.3 to port 27 >> >> I have noticed that when sending ~15 MB/s from 10.0.0.1, only about 10% >> actually arrives at 10.0.0.3. The `dump-flows` command shows that the bytes >> are dropped at port 25: >> >> root@PicOS-OVS$ovs-ofctl dump-ports th1 >> OFPST_PORT reply (OF1.4) (xid=0x2): 4 ports >> port 25: rx pkts=24956726, bytes=33491813828, drop=22503515, errs=0, >> frame=0, over=0, crc=0 >> tx pkts=73, bytes=4672, drop=0, errs=0, coll=0 >> duration=3355.201s >> >> Aside from an explicit flow that defines a drop action, what could be the >> cause of the bytes being dropped coming into port 25? I have verified that >> no other visible or hidden flows are active that could cause packet drops. >> >> I am using Open vSwitch version 2.0.90 and OpenFlow 1.4 on a pica8 hardware >> switch. No controller is active. > > You might get some more information from /tmp/log/messages. > > I suggest though that you follow this up with pica8 unless you have a > reproducible setup with an official release version of OVS.
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