But, I don't understand, all part of the two VMs are exactly the same except the network, because they're all created by OpenStack. The two VM booted on the same system, on the same NIC card, linked to the same switch......
From: Reid Price [mailto:[email protected]] Sent: Monday, October 21, 2013 7:41 AM To: Li, Chen Cc: Jesse Gross; [email protected] Subject: Re: [ovs-dev] vlan tag add/remove affect bandwidth a lot Hi chen, What Jesse is pointing out is that your problem seems unrelated to OVS. In particular, the low throughput you observe is probably related to something else in the system, be it drivers, VLAN offloading, intermediate network, etc. The point is that you already have verified for yourself that the actions don't really have an impact, especially compared to the effect when the traffic is ultimately tagged =) -Reid On Sat, Oct 19, 2013 at 4:57 AM, Li, Chen <[email protected]<mailto:[email protected]>> wrote: Sorry, I'm really new to OVS, can you give me more specific move I can do next? I'm eager to solve this ,but really have no idea where to start......:( From: Jesse Gross [mailto:[email protected]<mailto:[email protected]>] Sent: Saturday, October 19, 2013 12:16 AM To: Li, Chen Cc: [email protected]<mailto:[email protected]> Subject: Re: [ovs-dev] vlan tag add/remove affect bandwidth a lot On Fri, Oct 18, 2013 at 12:08 AM, Li, Chen <[email protected]<mailto:[email protected]>> wrote: I have changed my test method a little to make the issue more clear: As you can see, my vm has two virtual NIC, tap1 is working under VLAN (tag=2002), while tap2 is working under FLAT. And the bandwidth is : Test Node => tap1 2.85 Gbits/sec Test Node => tap2 9.40 Gbits/sec Flows rules applied: ovs-ofctl dump-flows br-int NXST_FLOW reply (xid=0x4): cookie=0x0, duration=2024.067s, table=0, n_packets=989820, n_bytes=23566560107, idle_age=1, priority=3,in_port=16,vlan_tci=0x0000 actions=mod_vlan_vid:2,NORMAL cookie=0x0, duration=2024.769s, table=0, n_packets=4873950, n_bytes=7378336782<tel:7378336782>, idle_age=20, priority=3,in_port=17,dl_vlan=2002 actions=mod_vlan_vid:1,NORMAL cookie=0x0, duration=2029.604s, table=0, n_packets=52, n_bytes=3768, idle_age=72, priority=2,in_port=16 actions=drop cookie=0x0, duration=2027.391s, table=0, n_packets=4729, n_bytes=286686, idle_age=1, priority=2,in_port=17 actions=drop cookie=0x0, duration=2031.156s, table=0, n_packets=3161368, n_bytes=208726297, idle_age=20, priority=1 actions=NORMAL ovs-ofctl dump-flows br-eth4 NXST_FLOW reply (xid=0x4): cookie=0x0, duration=2043.307s, table=0, n_packets=925503, n_bytes=61092489, idle_age=90, priority=4,in_port=7,dl_vlan=2 actions=strip_vlan,NORMAL cookie=0x0, duration=2048.566s, table=0, n_packets=47, n_bytes=3212, idle_age=91, priority=2,in_port=7 actions=drop cookie=0x0, duration=2049.988s, table=0, n_packets=989979, n_bytes=23566580239, idle_age=1, priority=1 actions=NORMAL ovs-ofctl dump-flows br-eth5 NXST_FLOW reply (xid=0x4): cookie=0x0, duration=2047.936s, table=0, n_packets=2235861, n_bytes=147635900, idle_age=43, priority=4,in_port=4,dl_vlan=1 actions=mod_vlan_vid:2002,NORMAL cookie=0x0, duration=2050.289s, table=0, n_packets=4784, n_bytes=293458, idle_age=1, priority=2,in_port=4 actions=drop cookie=0x0, duration=2051.95s, table=0, n_packets=305743, n_bytes=7076819244<tel:7076819244>, idle_age=1, priority=1 actions=NORMAL Both path has an adding and stripping of VLAN tags operation, so where can I find the difference from code ?? The problem is almost certainly not the actual modification of tags but in the interactions with the rest of the system. In that case, it's not surprising that rewriting the tags doesn't change anything. _______________________________________________ dev mailing list [email protected]<mailto:[email protected]> http://openvswitch.org/mailman/listinfo/dev
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