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Reordering caused by Flow Director

Hi,

 

 

we are experiencing packet reordering and thus bandwidth drops due to retransmissions on our servers. We are using RedHat 7.2 on HP Servers connected to a HP Aruba 1920 10GB switch. I can easily reproduce the issues by running iperf3 between the two servers. I have found a description of problems caused by Flow Director and migrating processes from Fermilab (https://mail.logica.com/owa/redir.aspx?C=VmeSIGgGxU6ljzLEwM20iBNG41y90NMIwuS9-EdO6GyiwXDZdcHLDijsUbT... https://arxiv.org/pdf/1106.0443.pdf) together with a support case at RedHat (https://mail.logica.com/owa/redir.aspx?C=VmeSIGgGxU6ljzLEwM20iBNG41y90NMIwuS9-EdO6GyiwXDZdcHLDijsUbT... https://access.redhat.com/solutions/2403071). What is offical position concerning this issue? Is it considered as bug?

An iperf test shows the retransmissions every couple of seconds:

iperf3 -c 192.168.120.11 -p 12345 -b200m -P20 -t0

 

Connecting to host 192.168.120.11, port 12345

 

[ 4] local 192.168.120.10 port 59638 connected to 192.168.120.11 port 12345

 

[ 6] local 192.168.120.10 port 59640 connected to 192.168.120.11 port 12345

 

[ 8] local 192.168.120.10 port 59642 connected to 192.168.120.11 port 12345

 

[ 10] local 192.168.120.10 port 59644 connected to 192.168.120.11 port 12345

 

[ 12] local 192.168.120.10 port 59646 connected to 192.168.120.11 port 12345

 

[ 14] local 192.168.120.10 port 59648 connected to 192.168.120.11 port 12345

 

[ 16] local 192.168.120.10 port 59650 connected to 192.168.120.11 port 12345

 

[ 18] local 192.168.120.10 port 59652 connected to 192.168.120.11 port 12345

 

[ 20] local 192.168.120.10 port 59654 connected to 192.168.120.11 port 12345

 

[ 22] local 192.168.120.10 port 59656 connected to 192.168.120.11 port 12345

 

[ 24] local 192.168.120.10 port 59658 connected to 192.168.120.11 port 12345

 

[ 26] local 192.168.120.10 port 59660 connected to 192.168.120.11 port 12345

 

[ 28] local 192.168.120.10 port 59662 connected to 192.168.120.11 port 12345

 

[ 30] local 192.168.120.10 port 59664 connected to 192.168.120.11 port 12345

 

[ 32] local 192.168.120.10 port 59666 connected to 192.168.120.11 port 12345

 

[ 34] local 192.168.120.10 port 59668 connected to 192.168.120.11 port 12345

 

[ 36] local 192.168.120.10 port 59670 connected to 192.168.120.11 port 12345

 

[ 38] local 192.168.120.10 port 59672 connected to 192.168.120.11 port 12345

 

[ 40] local 192.168.120.10 port 59674 connected to 192.168.120.11 port 12345

 

[ 42] local 192.168.120.10 port 59676 connected to 192.168.120.11 port 12345

 

[ ID] Interval Transfer Bandwidth Retr Cwnd

 

[ 4] 0.00-1.00 sec 21.9 MBytes 183 Mbits/sec 2 225 KBytes

 

[ 6] 0.00-1.00 sec 21.9 MBytes 183 Mbits/sec 1 202 KBytes

 

[ 8] 0.00-1.00 sec 21.9 MBytes 183 Mbits/sec 8 225 KBytes

 

[ 10] 0.00-1.00 sec 21.9 MBytes 183 Mbits/sec 2 132 KBytes

 

[ 12] 0.00-1.00 sec 21.9 MBytes 183 Mbits/sec 2 133 KBytes

 

[ 14] 0.00-1.00 sec 21.9 MBytes 183 Mbits/sec 2 132 KBytes

 

[ 16] 0.00-1.00 sec 21.9 MBytes 183 Mbits/sec 12 165 KBytes

 

[ 18] 0.00-1.00 sec 21.9 MBytes 183 Mbits/sec 2 151 KBytes

 

[ 20] 0.00-1.00 sec 21.9 MBytes 183 Mbits/sec 1 150 KBytes

 

[ 22] 0.00-1.00 sec 21.9 MBytes 183 Mbits/sec 4 225 KBytes

 

[ 24] 0.00-1.00 sec 21.9 MBytes 183 Mbits/sec 5 143 KBytes

 

[ 26] 0.00-1.00 sec 21.9 MBytes 183 Mbits/sec 3 132 KBytes

 

[ 28] 0.00-1.00 sec 21.9 MBytes 183 Mbits/sec 3 126 KBytes

 

[ 30] 0.00-1.00 sec 21.9 MBytes 183 Mbits/sec 1 127 KBytes

 

[ 32] 0.00-1.00 sec 21.9 MBytes 183 Mbits/sec 6 136 KBytes

 

[ 34] 0.00-1.00 sec 21.9 MBytes 183 Mbits/sec 2 139 KBytes

 

[ 36] 0.00-1.00 sec 21.9 MBytes 183 Mbits/sec 1 154 KBytes

 

[ 38] 0.00-1.00 sec 21.9 MBytes 183 Mbits/sec 1 136 KBytes

 

[ 40] 0.00-1.00 sec 21.9 MBytes 183 Mbits/sec 2 122 KBytes

 

[ 42] 0.00-1.00 sec 21.9 MBytes 183 Mbits/sec 4 139 KBytes

 

[SUM] 0.00-1.00 sec 438 MBytes 3.67 Gbits/sec 64

 

- - - - - - - - - - - - - - - - - - - - - - - - -

 

[ 4] 1.00-2.00 sec 24.0 MBytes 201 Mbits/sec 0 255 KBytes

 

[ 6] 1.00-2.00 sec 24.0 MBytes 201 Mbits/sec 0 243 KBytes

 

[ 8] 1.00-2.00 sec 24.0 MBytes 201 Mbits/sec 0 256 KBytes

 

[ 10] 1.00-2.00 sec 24.0 MBytes 201 Mbits/sec 0 191 KBytes

 

[ 12] 1.00-2.00 sec 24.0 MBytes 201 Mbits/sec 0 192 KBytes

 

[ 14] 1.00-2.00 sec 24.0 MBytes 201 Mbits/sec 0 192 KBytes

 

[ 16] 1.00-2.00 sec 24.0 MBytes 201 Mbits/sec 0 216 KBytes

 

[ 18] 1.00-2.00 sec 24.0 MBytes 201 Mbits/sec 0 208 KBytes

 

[ 20] 1.00-2.00 sec 24.0 MBytes 201 Mbits/sec 0 205 KBytes

 

[ 22] 1.00-2.00 sec 24.0 MBytes 201 Mbits/sec 0 259 KBytes

 

[ 24] 1.00-2.00 sec 24.0 MBytes 201 Mbits/sec 0 202 KBytes

 

[ 26] 1.00-2.00 sec 24.0 MBytes 201 Mbits/sec 0 198 KBytes

 

[ 28] 1.00-2.00 sec 24.0 MBytes 201 Mbits/sec 0 191 KBytes

 

[ 30] 1.00-2.00 sec 24.0 MBytes 201 Mbits/sec 0 192 KBytes

 

[ 32] 1.00-2.00 sec 24.0 MBytes 201 Mbits/sec 0 201 KBytes

 

[ 34] 1.00-2.00 sec 24.0 MBytes 201 Mbits/sec 0 198 KBytes

 

[ 36] 1.00-2.00 sec 24.0 MBytes 201 Mbits/sec 0 211 KBytes

 

[ 38] 1.00-2.00 sec 24.0 MBytes 201 Mbits/sec 0 198 KBytes

 

[ 40] 1.00-2.00 sec 24.0 MBytes 201 Mbits/sec 0 194 KBytes

 

[ 42] 1.00-2.00 sec 24.0 MBytes 201 Mbits/sec 0 198 KBytes

 

[SUM] 1.00-2.00 sec 480 MBytes 4.03 Gbits/sec 0

 

- - - - - - - - - - - - - - - - - - - - - - - - -

 

[ 4] 2.00-3.00 sec 23.8 MBytes 199 Mbits/sec 0 267 KBytes

 

[ 6] 2.00-3.00 sec 23.8 MBytes 199 Mbits/sec 0 250 KBytes

 

[ 8] 2....
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