The VMs are the same, but the traffic is not, one has VLAN tags, which seems to be provoking a difference in handling. Check that your drivers / intermediate switches are handling things correctly.
-Reid On Sun, Oct 20, 2013 at 5:57 PM, Li, Chen <chen...@intel.com> wrote: > 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:rpr...@nicira.com] > *Sent:* Monday, October 21, 2013 7:41 AM > *To:* Li, Chen > *Cc:* Jesse Gross; dev@openvswitch.org > > *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 <chen...@intel.com> 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……L**** > > **** > > *From:* Jesse Gross [mailto:je...@nicira.com] > *Sent:* Saturday, October 19, 2013 12:16 AM > *To:* Li, Chen > *Cc:* dev@openvswitch.org > *Subject:* Re: [ovs-dev] vlan tag add/remove affect bandwidth a lot**** > > **** > > On Fri, Oct 18, 2013 at 12:08 AM, Li, Chen <chen...@intel.com> 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, 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, 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 > dev@openvswitch.org > http://openvswitch.org/mailman/listinfo/dev**** > > ** ** >
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