OK, after looking at all of your results, I am more confused than ever. Most of the stats that "ovs-dpctl -s show" reports come from exactly the same place in the kernel as stats reported by "ifconfig" or in /sys/class/net/eth1/statistics. tx_dropped and rx_dropped are among those. I can't explain why "ovs-dpctl" reports different numbers. In general, I would tend to believe the other sources.
On Fri, Sep 19, 2014 at 02:13:36PM -0400, samantha Andares wrote: > ovs_version: "2.0.2" > > > Date: Fri, 19 Sep 2014 11:11:03 -0700 > > From: b...@nicira.com > > To: sam.anda...@hotmail.com > > CC: discuss@openvswitch.org; d...@openvswitch.org > > Subject: Re: [ovs-dev] debugging OVS > > > > What version of OVS is this? > > > > On Fri, Sep 19, 2014 at 02:02:11PM -0400, samantha Andares wrote: > > > Hi ben, > > > > > > zero (0) > > > > > > root@arm:/sys/class/net/eth1/statistics# cat tx_dropped > > > 0 > > > > > > if you want all the stats... > > > root@arm:/sys/class/net/eth1/statistics# cat * > > > 0 > > > 0 > > > 2436387 > > > 0 > > > 0 > > > 12 > > > 5 > > > 0 > > > 0 > > > 5 > > > 0 > > > 0 > > > 13880 > > > 0 > > > 4856185 > > > 0 > > > 0 > > > 0 > > > 0 > > > 0 > > > 0 > > > 76248 > > > 0 > > > > > > although here's the ovs-dpctl -s show once more: > > > port 4: eth1 > > > RX packets:13856 errors:5 dropped:12 overruns:0 frame:0 > > > TX packets:76282 errors:0 dropped:34299 aborted:0 > > > carrier:0 > > > collisions:0 > > > RX bytes:2625108 (2.5 MiB) TX bytes:4552367 (4.3 MiB) > > > > > > thanks for your time > > > > > > sam > > > > > > > Date: Fri, 19 Sep 2014 10:07:52 -0700 > > > > From: b...@nicira.com > > > > To: sam.anda...@hotmail.com > > > > CC: discuss@openvswitch.org; d...@openvswitch.org > > > > Subject: Re: [ovs-dev] debugging OVS > > > > > > > > What's in /sys/class/net/eth1/statistics/tx_dropped? > > > > > > > > On Fri, Sep 19, 2014 at 11:40:25AM -0400, samantha Andares wrote: > > > > > Ben, > > > > > > > > > > Here is the output of the physical interface > > > > > > > > > > eth1 Link encap:Ethernet HWaddr 00:0e:c6:88:d2:22 > > > > > inet6 addr: fe80::20e:c6ff:fe88:d222/64 Scope:Link > > > > > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > > > > > RX packets:1538 errors:0 dropped:12 overruns:0 frame:0 > > > > > TX packets:63290 errors:0 dropped:0 overruns:0 carrier:0 > > > > > collisions:0 txqueuelen:1000 > > > > > RX bytes:270154 (270.1 KB) TX bytes:2966862 (2.9 MB) > > > > > > > > > > and you can see there are no dropped count in there! > > > > > > > > > > sam > > > > > > > > > > > Date: Fri, 19 Sep 2014 08:33:27 -0700 > > > > > > From: b...@nicira.com > > > > > > To: sam.anda...@hotmail.com > > > > > > CC: discuss@openvswitch.org; d...@openvswitch.org > > > > > > Subject: Re: [ovs-dev] debugging OVS > > > > > > > > > > > > Can you show us the "ovs-dpctl show" output? > > > > > > > > > > > > Thanks, > > > > > > > > > > > > Ben. > > > > > > > > > > > > On Fri, Sep 19, 2014 at 11:30:05AM -0400, samantha Andares wrote: > > > > > > > hi ben, > > > > > > > > > > > > > > thanks for your feedback. > > > > > > > > > > > > > > I am getting 100% packets drop.. If problem was with the amount > > > > > > > of messages... I presume some would have been going through... as > > > > > > > stated in my latest email.... this is specific to when going out > > > > > > > on a USB to Ethernet adaptor on a specific hardware (beagle bone > > > > > > > board). I am using OVS 2.0 and Ubuntu 14.04. How can we analyse > > > > > > > the messages in userspace and why would the message go to > > > > > > > userspace... shouldn't it stay in kernel space if it matches a > > > > > > > flow and just be forwarded to the outgoing physical port as per > > > > > > > the rule is saying? My traffic is simple iperf udp messages.. > > > > > > > tried flow of 10MB and 100KB... problem is the same... > > > > > > > > > > > > > > thanks, > > > > > > > > > > > > > > sam > > > > > > > > > > > > > > > Date: Fri, 19 Sep 2014 08:20:24 -0700 > > > > > > > > From: b...@nicira.com > > > > > > > > To: sam.anda...@hotmail.com > > > > > > > > CC: discuss@openvswitch.org; d...@openvswitch.org > > > > > > > > Subject: Re: [ovs-dev] debugging OVS > > > > > > > > > > > > > > > > [dropping mininet-discuss because it is a closed mailing list > > > > > > > > and I am > > > > > > > > not a subscriber] > > > > > > > > > > > > > > > > On Thu, Sep 18, 2014 at 05:37:43PM -0400, samantha Andares > > > > > > > > wrote: > > > > > > > > > I am getting packets dropped when going out of an OVS bridge. > > > > > > > > > The TX > > > > > > > > > dropped is increased in ovs-dpctl but not at the physical > > > > > > > > > interface > > > > > > > > > level (ifconfig). > > > > > > > > > > > > > > > > > > Can anyone tell me how to enable some OVS debugging so I can > > > > > > > > > find the > > > > > > > > > reason to fix that problem? > > > > > > > > > > > > > > > > Do you mean that ovs-dpctl shows the datapath's "drop" count is > > > > > > > > going > > > > > > > > up? If so, the problem is that packets that need attention from > > > > > > > > userspace are arriving faster than userspace can process them. > > > > > > > > The best > > > > > > > > way to reduce drops is to upgrade to the latest version of Open > > > > > > > > vSwitch, > > > > > > > > which is 2.3, because we've spent a lot of time the last few > > > > > > > > years > > > > > > > > coming up with ways to reduce the number of packets that have > > > > > > > > to be sent > > > > > > > > to userspace. If you are already using 2.3, then I am > > > > > > > > surprised that > > > > > > > > you are seeing lots of drops. Is there anything unusual about > > > > > > > > your > > > > > > > > environment or the traffic that you are using? > > > > > > > > > > > > > > > > _______________________________________________ discuss mailing list discuss@openvswitch.org http://openvswitch.org/mailman/listinfo/discuss
