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Re: [Qemu-devel] [network performance question] only ~2Gbps throughput b


From: Venkateswara Rao Nandigam
Subject: Re: [Qemu-devel] [network performance question] only ~2Gbps throughput between two linux guests which are running on the same host via netperf -t TCP_STREAM -m 1400, but xen can achieve ~7Gbps
Date: Fri, 6 Jun 2014 07:15:17 +0000

Sorry, That's

Try Rx/Tx checksum offload "OFF" on the all the concerned guests of  both 
Hypervisors.

-----Original Message-----
From: Venkateswara Rao Nandigam 
Sent: Friday, June 06, 2014 12:43 PM
To: 'Zhang Haoyu'; kvm; qemu-devel
Cc: Gleb Natapov; Paolo Bonzini; Michael S.Tsirkin; yewudi
Subject: RE: [network performance question] only ~2Gbps throughput between two 
linux guests which are running on the same host via netperf -t TCP_STREAM -m 
1400, but xen can achieve ~7Gbps

>>> And, vhost enabled, tx zero-copy enabled, virtio TSO enabled on kvm.

Try lro "ON" on client side. This would require mergable Rx buffers to be ON.

And  Xen netfront to KVM virtio are not apples to apples because of their 
implementation details. 

Try Rx/Tx checksum offload on the all the concerned guests of  both Hypervisors.

-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Zhang Haoyu
Sent: Friday, June 06, 2014 9:01 AM
To: kvm; qemu-devel
Cc: Gleb Natapov; Paolo Bonzini; Michael S.Tsirkin; yewudi
Subject: [network performance question] only ~2Gbps throughput between two 
linux guests which are running on the same host via netperf -t TCP_STREAM -m 
1400, but xen can achieve ~7Gbps

Hi, all

I ran two linux guest on the same kvm host, then start the netserver on one vm, 
start netperf on the other one,  netperf command and test result shown as 
below, netperf -H 196.5.5.71 -t TCP_STREAM -l 60 -- -m 1400 -M 1400 MIGRATED 
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 196.5.5.71 () port 0 
AF_INET : nodelay
Recv   Send    Send                          
Socket Socket  Message  Elapsed              
Size   Size    Size     Time     Throughput  
bytes  bytes   bytes    secs.    10^6bits/sec  

 87380  16384   1400    60.01    2355.45   

but I ran two linux guest on the same xen hypervisor, ~7Gbps throughput 
achived, netperf command and test result shown as below, netperf -H 196.5.5.71 
-t TCP_STREAM -l 60 -- -m 1400 -M 1400 MIGRATED TCP STREAM TEST from 0.0.0.0 
(0.0.0.0) port 0 AF_INET to 196.5.5.71 () port 0 AF_INET
Recv   Send    Send                          
Socket Socket  Message  Elapsed              
Size   Size    Size     Time     Throughput  
bytes  bytes   bytes    secs.    10^6bits/sec  

 87380  16384   1400    60.01    2349.82

many times test performed, the result is similar as above.

When I tcpdump backend tap netdevice, found that most packets' size is 
1448bytes on kvm, and few packets are ~60000Bytes, but  I tcpdump backend vif 
netdevice, found that  most packets' size is >60000bytes on xen.
Test result of netperf -t TCP_STREAM -m 64 is similar, more larger packets on 
xen than kvm. 

And, vhost enabled, tx zero-copy enabled, virtio TSO enabled on kvm.

Any ideas?

Thanks,
Zhang Haoyu

<environment>
guest: linux-3.10, or centos-6.3
host: linux-3.10(kvm), xenserver-6.2

<test tool>
netperf-2.6

<test result details>
1. KVM
netperf -H 196.5.5.71 -t TCP_STREAM -l 60 -- -m 65000 -M 65000 MIGRATED TCP 
STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 196.5.5.71 () port 0 
AF_INET
Recv   Send    Send                          
Socket Socket  Message  Elapsed              
Size   Size    Size     Time     Throughput  
bytes  bytes   bytes    secs.    10^6bits/sec  

 87380  16384  65000    60.00    13743.44 

netperf -H 196.5.5.71 -t TCP_STREAM -l 60 -- -m 1400 -M 1400 MIGRATED TCP 
STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 196.5.5.71 () port 0 
AF_INET
Recv   Send    Send                          
Socket Socket  Message  Elapsed              
Size   Size    Size     Time     Throughput  
bytes  bytes   bytes    secs.    10^6bits/sec  

 87380  16384   1400    60.01    2349.82   

netperf -H 196.5.5.71 -t TCP_STREAM -l 60 -- -m 64 -M 64 MIGRATED TCP STREAM 
TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 196.5.5.71 () port 0 AF_INET
Recv   Send    Send                          
Socket Socket  Message  Elapsed              
Size   Size    Size     Time     Throughput  
bytes  bytes   bytes    secs.    10^6bits/sec  

 87380  16384     64    60.01     294.70  

2. XEN
netperf -H 196.6.6.71 -t TCP_STREAM -l 60 -- -m 65000 -M 65000 MIGRATED TCP 
STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 196.6.6.71 () port 0 
AF_INET
Recv   Send    Send                          
Socket Socket  Message  Elapsed              
Size   Size    Size     Time     Throughput  
bytes  bytes   bytes    secs.    10^6bits/sec  

 87380  16384  65000    60.01    6327.46 

netperf -H 196.6.6.71 -t TCP_STREAM -l 60 -- -m 1400 -M 1400 MIGRATED TCP 
STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 196.6.6.71 () port 0 
AF_INET
Recv   Send    Send                          
Socket Socket  Message  Elapsed              
Size   Size    Size     Time     Throughput  
bytes  bytes   bytes    secs.    10^6bits/sec  

 87380  16384   1400    60.00    7250.63  

netperf -H 196.6.6.71 -t TCP_STREAM -l 60 -- -m 64 -M 64 MIGRATED TCP STREAM 
TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 196.6.6.71 () port 0 AF_INET
Recv   Send    Send                          
Socket Socket  Message  Elapsed              
Size   Size    Size     Time     Throughput  
bytes  bytes   bytes    secs.    10^6bits/sec  

 87380  16384     64    60.00     668.25  

<piece of tcpdump result on backend tap netdevice>
11:26:28.907130 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5421192:5422640, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907146 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5422640:5424088, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907161 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 5419328, 
win 24576, options [nop,nop,TS val 497985 ecr 497408], length 0
11:26:28.907164 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5424088:5425536, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907183 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5426984:5428432, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907203 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 5421192, 
win 24576, options [nop,nop,TS val 497985 ecr 497408], length 0
11:26:28.907217 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5428432:5429880, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907225 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5429880:5431328, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907238 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5431328:5432776, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907256 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5432776:5434224, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907268 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 5426984, 
win 24576, options [nop,nop,TS val 497985 ecr 497408], length 0
11:26:28.907294 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [P.], seq 
5434224:5434692, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 468
11:26:28.907311 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 5429880, 
win 24576, options [nop,nop,TS val 497985 ecr 497408], length 0
11:26:28.907319 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 5432776, 
win 24576, options [nop,nop,TS val 497985 ecr 497408], length 0
11:26:28.907345 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5434692:5436140, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907363 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5436140:5437588, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907373 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 5434692, 
win 24576, options [nop,nop,TS val 497985 ecr 497408], length 0
11:26:28.907385 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5437588:5439036, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907411 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5439036:5440484, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907427 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [P.], seq 
5440484:5440692, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 208
11:26:28.907427 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 5437588, 
win 24576, options [nop,nop,TS val 497985 ecr 497408], length 0
11:26:28.907445 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5440692:5442140, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907453 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5442140:5443588, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907468 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5443588:5445036, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907494 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5445036:5446484, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907496 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 5440484, 
win 24576, options [nop,nop,TS val 497985 ecr 497408], length 0
11:26:28.907506 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5446484:5447932, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907539 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5447932:5449380, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907551 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 5445036, 
win 24576, options [nop,nop,TS val 497985 ecr 497408], length 0
11:26:28.907555 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5449380:5450828, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907566 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [P.], seq 
5450828:5451192, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 364
11:26:28.907605 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5451192:5452640, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907623 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5452640:5454088, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907631 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5454088:5455536, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907646 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5455536:5456984, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907662 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5456984:5458432, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907670 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5458432:5459880, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907690 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5459880:5461328, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907699 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5461328:5462776, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907704 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 5450828, 
win 24576, options [nop,nop,TS val 497985 ecr 497408], length 0
11:26:28.907708 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5462776:5464224, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907721 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5464224:5465672, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907739 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5465672:5467120, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907764 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
5468568:5470016, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 1448
11:26:28.907793 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [P.], seq 
5470016:5470692, ack 1, win 115, options [nop,nop,TS val 497408 ecr 497985], 
length 676
11:26:28.907796 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 5455536, 
win 24576, options [nop,nop,TS val 497985 ecr 497408], length 0
11:26:28.937289 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
7273240:7274688, ack 1, win 115, options [nop,nop,TS val 497416 ecr 497988], 
length 1448
11:26:28.941798 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6259640, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941815 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6262536, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941820 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6265432, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941825 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6268328, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941829 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6271224, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941834 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6274120, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941839 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6277016, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941843 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6279912, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941848 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6282808, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941852 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6285704, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941856 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6288600, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941873 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6291496, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941888 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6294392, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941893 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6297288, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941904 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6300184, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941909 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6303080, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941919 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6305976, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941924 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6308872, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941934 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6311768, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941939 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6314664, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941950 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6317560, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941955 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6320456, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941961 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6323352, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941966 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6326248, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941967 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
7274688:7276136, ack 1, win 115, options [nop,nop,TS val 497417 ecr 497993], 
length 1448
11:26:28.941970 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6329144, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941975 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6332040, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941980 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6334936, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941985 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6337832, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941991 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6342176, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.941995 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6345072, 
win 24576, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.942001 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6362448, 
win 24441, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.942118 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
7276136:7338400, ack 1, win 115, options [nop,nop,TS val 497417 ecr 497993], 
length 62264
11:26:28.942220 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6579648, 
win 22745, options [nop,nop,TS val 497993 ecr 497411], length 0
11:26:28.942456 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
7338400:7403560, ack 1, win 115, options [nop,nop,TS val 497417 ecr 497993], 
length 65160
11:26:28.942501 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
7403560:7468720, ack 1, win 115, options [nop,nop,TS val 497417 ecr 497993], 
length 65160
11:26:28.942547 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
7468720:7533880, ack 1, win 115, options [nop,nop,TS val 497417 ecr 497993], 
length 65160
11:26:28.942689 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6640464, 
win 22964, options [nop,nop,TS val 497994 ecr 497412], length 0
11:26:28.942701 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6720104, 
win 23145, options [nop,nop,TS val 497994 ecr 497412], length 0
11:26:28.942726 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6743272, 
win 23833, options [nop,nop,TS val 497994 ecr 497412], length 0
11:26:28.942864 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
7533880:7599040, ack 1, win 115, options [nop,nop,TS val 497417 ecr 497994], 
length 65160
11:26:28.942886 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6811328, 
win 24159, options [nop,nop,TS val 497994 ecr 497412], length 0
11:26:28.942918 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
7599040:7664200, ack 1, win 115, options [nop,nop,TS val 497417 ecr 497994], 
length 65160
11:26:28.942971 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
7664200:7729360, ack 1, win 115, options [nop,nop,TS val 497417 ecr 497994], 
length 65160
11:26:28.943019 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
7729360:7794520, ack 1, win 115, options [nop,nop,TS val 497417 ecr 497994], 
length 65160
11:26:28.943041 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6882280, 
win 24268, options [nop,nop,TS val 497994 ecr 497412], length 0
11:26:28.943187 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
7794520:7859680, ack 1, win 115, options [nop,nop,TS val 497417 ecr 497994], 
length 65160
11:26:28.943404 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6928616, 
win 24576, options [nop,nop,TS val 497994 ecr 497412], length 0
11:26:28.943415 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6935856, 
win 24576, options [nop,nop,TS val 497994 ecr 497412], length 0
11:26:28.943420 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6938752, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943427 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6941648, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943433 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6944544, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943438 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6947440, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943444 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6950336, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943452 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6953232, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943458 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6956128, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943463 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6959024, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943468 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6961920, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943473 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6964816, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943479 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6969160, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943487 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6972056, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943493 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6974952, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943500 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6977848, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943505 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6980744, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943511 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6983640, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943519 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6986536, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943525 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6989432, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943533 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6992328, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943542 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6995224, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943546 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 6998120, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943550 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 7001016, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943554 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 7003912, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943558 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 7006808, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943562 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 7011152, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943566 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 7014048, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943570 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
7859680:7924840, ack 1, win 115, options [nop,nop,TS val 497417 ecr 497994], 
length 65160
11:26:28.943607 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 7077760, 
win 24079, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943673 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
7924840:7990000, ack 1, win 115, options [nop,nop,TS val 497417 ecr 497994], 
length 65160
11:26:28.943711 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 7096584, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943731 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 7099480, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943750 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 7102376, 
win 24576, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943777 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
7990000:8055160, ack 1, win 115, options [nop,nop,TS val 497417 ecr 497994], 
length 65160
11:26:28.943822 IP 196.5.5.81.40337 > 196.5.5.82.50445: Flags [.], ack 7177672, 
win 23988, options [nop,nop,TS val 497994 ecr 497413], length 0
11:26:28.943833 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
8055160:8115976, ack 1, win 115, options [nop,nop,TS val 497417 ecr 497994], 
length 60816
11:26:28.943954 IP 196.5.5.82.50445 > 196.5.5.81.40337: Flags [.], seq 
8115976:8120320, ack 1, win 115, options [nop,nop,TS val 497417 ecr 497994], 
length 4344

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