Hi Abhishek,
Can you please run “tcpdump –x” on vhost0 and the physical interface (eth0)
concurrently and compare the packets to see if anything changed between vhost0
and eth0 (I.e. after vrouter processed the packet)?
Raja
From: abhishek jain <[email protected]<mailto:[email protected]>>
Date: Wednesday, September 30, 2015 at 8:41 AM
To: Rajagopalan Sivaramakrishnan <[email protected]<mailto:[email protected]>>
Cc: "[email protected]<mailto:[email protected]>"
<[email protected]<mailto:[email protected]>>,
"[email protected]<mailto:[email protected]>"
<[email protected]<mailto:[email protected]>>
Subject: Re: [opencontrail-dev] Checksum offload error with
contrail-vrouter-agent running on compute node
Hi Raja
Below are the inline answers for your queries..
Are you seeing any checksum errors go up on the receiver of the ping (using
netstat)?
The Below fields are incresing at the receiver side when ping is initiated from
the compute node running contrail-vrouter-agent..
netstat -s
Ip:
4666082 total packets received
4051 with invalid headers
2 with invalid addresses
22 forwarded
0 incoming packets discarded
4558747 incoming packets delivered
4493351 requests sent out
12 outgoing packets dropped
13 fragments dropped after timeout
42 reassemblies required
7 packets reassembled ok
13 packet reassembles failed
Icmp:
17279 ICMP messages received
32 input ICMP message failed.
ICMP input histogram:
destination unreachable: 2068
timeout in transit: 14
echo requests: 13570
echo replies: 1627
17190 ICMP messages sent
0 ICMP messages failed
ICMP output histogram:
destination unreachable: 1776
redirect: 12
echo request: 1832
echo replies: 13570
IcmpMsg:
InType0: 1627
InType3: 2068
InType8: 13570
InType11: 14
OutType0: 13570
OutType3: 1776
OutType5: 12
OutType8: 1832
Tcp:
251330 active connections openings
127809 passive connection openings
118574 failed connection attempts
170 connection resets received
24 connections established
3254207 segments received
3777193 segments send out
11826 segments retransmited
144 bad segments received.
The above coloured field is increasing at the receiver only after ping is
initiated from the compute node.
Not having the dropstats command on powerpc ubuntu.
When we try to run droptstat command, we got the below prints
#############################################
dropstats
Usage: dropstats [--help]
Usage: dropstats [--core|-c] <core number>
--core <core number> Show statistics for a specified CPU core
###################################################
Then when we analyse the dropstats.c program, we found that it is getting error
at the main function itself.
The variable "opt" is not getting any valid values, so the switch case is going
to the default case and it prints the above prints..
When I print the opt value, it is giving some garbage value itseems,
##################################################
dropstats
OPT VAlue : �
Usage: dropstats [--help]
Usage: dropstats [--core|-c] <core number>
--core <core number> Show statistics for a specified CPU core
##################################################
Please help us regarding this.
Thanks
On Wed, Sep 30, 2015 at 11:24 AM, Rajagopalan Sivaramakrishnan
<[email protected]<mailto:[email protected]>> wrote:
>Not having the dropstats command on powerpc ubuntu.
This should be built when you build vrouter utils. If you have “rt” and “nh”
utilities working, this should work too.
Are you seeing any checksum errors go up on the receiver of the ping (using
netstat)?
Please check if any counters are going up corresponding to the reception of the
pings. The absolute values of the counters are not useful.
netstat -s
Ip:
621360 total packets received
1722 with invalid headers
2 with invalid addresses
1 forwarded
0 incoming packets discarded
596580 incoming packets delivered
490572 requests sent out
1 outgoing packets dropped
3 fragments dropped after timeout
8 reassemblies required
1 packets reassembled ok
3 packet reassembles failed
Icmp:
5542 ICMP messages received
10 input ICMP message failed.
ICMP input histogram:
destination unreachable: 180
timeout in transit: 12
echo requests: 3730
echo replies: 1620
5717 ICMP messages sent
0 ICMP messages failed
ICMP output histogram:
destination unreachable: 180
redirect: 1
echo request: 1806
echo replies: 3730
IcmpMsg:
InType0: 1620
InType3: 180
InType8: 3730
InType11: 12
OutType0: 3730
OutType3: 180
OutType5: 1
OutType8: 1806
Tcp:
46413 active connections openings
23428 passive connection openings
21350 failed connection attempts
45 connection resets received
42 connections established
434130 segments received
431999 segments send out
938 segments retransmited
32 bad segments received.
22332 resets sent
Udp:
182146 packets received
21 packets to unknown port received.
0 packet receive errors
51965 packets sent
UdpLite:
TcpExt:
24030 TCP sockets finished time wait in fast timer
2774 delayed acks sent
Quick ack mode was activated 154 times
36 packets directly queued to recvmsg prequeue.
2176 bytes directly received in process context from prequeue
68980 packet headers predicted
4 packets header predicted and directly queued to user
81153 acknowledgments not containing data payload received
50692 predicted acknowledgments
20 times recovered from packet loss by selective acknowledgements
Detected reordering 2 times using SACK
Detected reordering 6 times using time stamp
7 congestion windows fully recovered without slow start
59 congestion windows partially recovered using Hoe heuristic
1 congestion windows recovered without slow start by DSACK
309 congestion windows recovered without slow start after partial ack
20 fast retransmits
11 forward retransmits
11 retransmits in slow start
584 other TCP timeouts
1 SACK retransmits failed
212 DSACKs sent for old packets
29 DSACKs sent for out of order packets
240 DSACKs received
272 connections reset due to unexpected data
22 connections reset due to early user close
30 connections aborted due to timeout
TCPDSACKIgnoredOld: 1
TCPDSACKIgnoredNoUndo: 50
TCPSackShiftFallback: 198
IPReversePathFilter: 120
TCPRcvCoalesce: 15109
TCPChallengeACK: 37
TCPSYNChallenge: 32
IpExt:
InMcastPkts: 57521
OutMcastPkts: 4516
InBcastPkts: 54973
OutBcastPkts: 521
InOctets: 128287765
OutOctets: 58739537
InMcastOctets: 14558645
OutMcastOctets: 372894
InBcastOctets: 7484935
OutBcastOctets: 92175
On Wed, Sep 30, 2015 at 11:08 AM, Rajagopalan Sivaramakrishnan
<[email protected]<mailto:[email protected]>> wrote:
Hi Abhishek,
Are you still able to ping when the agent is not running? Did you try using
“dropstats" to see if there are any drops inside vrouter?
Are you seeing any checksum errors go up on the receiver of the ping (using
netstat)?
Raja
From: Dev
<[email protected]<mailto:[email protected]>>
on behalf of abhishek jain
<[email protected]<mailto:[email protected]>>
Date: Tuesday, September 29, 2015 at 10:50 AM
To: "[email protected]<mailto:[email protected]>"
<[email protected]<mailto:[email protected]>>,
"[email protected]<mailto:[email protected]>"
<[email protected]<mailto:[email protected]>>
Subject: Re: [opencontrail-dev] Checksum offload error with
contrail-vrouter-agent running on compute node
CCing Omartsyniuk
On Tue, Sep 29, 2015 at 7:36 PM, abhishek jain
<[email protected]<mailto:[email protected]>> wrote:
Hi Team
We are getting checksum error from the powerpc ubuntu 32 bit as compute node
when the contrail-voruter-agent userspace agent is running after ping is
initiated from the compute node.Please find the attached screanshot for the
same.We have disabled checksum offload at both eth0 as well as vhost0 on the
powerpc ubuntu.
ethtool -K eth0 tx off
ethtool -k vhost0 | grep checksum
rx-checksumming: off [fixed]
tx-checksumming: off
tx-checksum-ipv4: off [fixed]
tx-checksum-ip-generic: off [fixed]
tx-checksum-ipv6: off [fixed]
tx-checksum-fcoe-crc: off [fixed]
tx-checksum-sctp: off [fixed]
However still we are not able ping the outside world with
contrail-vrouter-agent binary running and we are facing same ipv4 checksum
offload incorrect error when we capture packets after ping is initiated from
the compute node.
Do we need to make changes in contrail-vrouter-agent code regarding this?
Please help regarding this.
Thanks
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