Jesse,

Dmesg hasn't changed for a while .. and sadly it is not time-stamped.  Below is 
the tail:

..
device vif467.1 entered promiscuous mode
device tap467.0 entered promiscuous mode
device tap467.1 entered promiscuous mode
/local/domain/465/device/vif/0: Connected
/local/domain/465/device/vif/1: Connected
/local/domain/466/device/vif/0: Connected
/local/domain/466/device/vif/1: Connected
/local/domain/467/device/vif/0: Connected
/local/domain/467/device/vif/1: Connected
vif458.2: draining TX queue
vif456.2: draining TX queue
vif457.2: draining TX queue
vif459.2: draining TX queue

> What are the outputs of dmesg and ovs-dpctl show?

[root@localhost ~]# ovs-dpctl show
system@xenbr0:
        lookups: frags:0, hit:14616686, missed:3478742, lost:0
        port 0: xenbr0 (internal)
        port 1: eth0
        port 2: vif455.0
system@xenbr13:
        lookups: frags:0, hit:593802148, missed:104343731, lost:0
        port 0: xenbr13 (internal)
        port 1: eth13
        port 2: vif457.2
system@xenbr7:
        lookups: frags:0, hit:3920419, missed:925949, lost:0
        port 0: xenbr7 (internal)
        port 2: eth7
system@xenbr4:
        lookups: frags:0, hit:3915022, missed:924411, lost:562
        port 0: xenbr4 (internal)
        port 1: eth4
system@xenbr9:
        lookups: frags:0, hit:3915487, missed:923946, lost:0
        port 0: xenbr9 (internal)
        port 1: eth9
system@xenbr3:
        lookups: frags:0, hit:5683665220, missed:12414007, lost:0
        port 0: xenbr3 (internal)
        port 1: eth3
        port 2: xapi22 (internal)
        port 3: vif456.1
        port 4: vif461.1
        port 5: vif457.1
        port 6: vif462.1
        port 7: vif458.1
        port 8: vif463.1
        port 9: vif459.1
        port 10: vif464.1
        port 11: vif460.1
        port 12: vif465.1
        port 13: vif467.1
        port 15: vif466.1
system@xenbr1:
        lookups: frags:0, hit:8477, missed:1261, lost:0
        port 0: xenbr1 (internal)
        port 1: eth1
system@xenbr10:
        lookups: frags:0, hit:3914906, missed:924527, lost:0
        port 0: xenbr10 (internal)
        port 1: eth10
system@xenbr6:
        lookups: frags:0, hit:3915340, missed:924093, lost:0
        port 0: xenbr6 (internal)
        port 1: eth6
system@xenbr12:
        lookups: frags:0, hit:633864034, missed:124577500, lost:0
        port 0: xenbr12 (internal)
        port 1: eth12
        port 2: vif458.2
system@xenbr8:
        lookups: frags:0, hit:3914333, missed:925100, lost:374
        port 0: xenbr8 (internal)
        port 1: eth8
system@xenbr2:
        lookups: frags:0, hit:110495900, missed:1284600, lost:34
        port 0: xenbr2 (internal)
        port 1: eth2
        port 2: xapi21 (internal)
        port 3: vif455.1
        port 4: vif462.0
        port 5: vif456.0
        port 6: vif461.0
        port 7: vif457.0
        port 8: vif458.0
        port 9: vif465.0
        port 10: vif459.0
        port 11: vif467.0
        port 12: vif460.0
        port 13: vif463.0
        port 14: vif464.0
        port 16: vif466.0
system@xenbr11:
        lookups: frags:0, hit:813453787, missed:188880581, lost:593198
        port 0: xenbr11 (internal)
        port 1: eth11
        port 2: vif459.2
system@xenbr14:
        lookups: frags:0, hit:772844627, missed:147971589, lost:332
        port 0: xenbr14 (internal)
        port 1: eth14
        port 2: vif456.2
system@xenbr5:
        lookups: frags:0, hit:3915489, missed:923944, lost:0
        port 0: xenbr5 (internal)
        port 1: eth5


Regards,

Juan

-----Original Message-----
From: Jesse Gross [mailto:je...@nicira.com] 
Sent: Wednesday, February 01, 2012 5:54 PM
To: Juan Tellez
Cc: discuss@openvswitch.org
Subject: Re: [ovs-discuss] xenServer and openVswitch 1.0.99

On Wed, Feb 1, 2012 at 5:18 PM, Juan Tellez <j...@embrane.com> wrote:
> We also suspect vswitchd as responsible for dropping packets.
>
>
>
>     39:          RX packets:494125 errors:0 dropped:0 overruns:0 frame:0
>
>      40:          TX packets:519707 errors:0 dropped:8357 overruns:0
> carrier:0
>
>      46:          RX packets:455837 errors:0 dropped:0 overruns:0 frame:0
>
>      47:          TX packets:485736 errors:0 dropped:10118 overruns:0
> carrier:0
>
>      53:          RX packets:455547 errors:0 dropped:0 overruns:0 frame:0
>
>      54:          TX packets:484577 errors:0 dropped:5718 overruns:0
> carrier:0
>
>      60:          RX packets:455611 errors:0 dropped:0 overruns:0 frame:0
>
>      61:          TX packets:481385 errors:0 dropped:10404 overruns:0
> carrier:0
>
>      67:          RX packets:455162 errors:0 dropped:0 overruns:0 frame:0

These stats are coming from your NIC? Assuming yes, it's unlikely that
they are caused by OVS directly because those are hardware counters.
Since OVS runs before hardware transmit, in order for the packet to be
dropped in hardware it would have to already have passed through OVS.
       
What are the outputs of dmesg and ovs-dpctl show?
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