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[rare-dev] Counter packets and bytes


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  • From: Carmen Misa Moreira <>
  • To: <>
  • Subject: [rare-dev] Counter packets and bytes
  • Date: Tue, 28 Jun 2022 11:55:46 +0200
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Hi,

I'm using iperf3 with the -k flag to send 1000 packets:

root@itcs-p4srv-02:/home/mmisamor# iperf3 -c 2001:1458:301:cd::100:3d8 -L 32772 -p 5204 -i 10 -k 1000 &
[1] 74718
root@itcs-p4srv-02:/home/mmisamor# Connecting to host 2001:1458:301:cd::100:3d8, port 5204
[  5] local 2001:67c:2c4:1::2 port 45904 connected to 2001:1458:301:cd::100:3d8 port 5204
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-0.11   sec   124 MBytes  9.09 Gbits/sec  202    683 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-0.11   sec   124 MBytes  9.09 Gbits/sec  202             sender
[  5]   0.00-0.12   sec   121 MBytes  8.81 Gbits/sec                  receiver

iperf Done.

But on the switch I received more than 1k packets -> 1713 packets:

E513-E-YECWH-1#show access-list acl_all_ipv6_flowlabels
     tx          rx                  timers
seq  byte  pack  byte        pack    last      timout    cfg
10   0+0   0+0   0+0         0+0     never     00:00:00  all any all any all flow 131076&261884
11   0+0   0+0   0+0         0+0     never     00:00:00  all any all any all flow 65540&261884
12   0+0   0+0   0+0         0+0     never     00:00:00  all any all any all flow 196612&261884
13   0+0   0+0   0+165006    0+1713  00:00:01  00:00:00  all any all any all flow 32772&261884
20   0+0   0+0   0+0         0+0     never     00:00:00  all any all any all flow 131072&261632
21   0+0   0+0   0+0         0+0     never     00:00:00  all any all any all flow 65536&261632
22   0+0   0+0   0+0         0+0     never     00:00:00  all any all any all flow 196608&261632
23   0+0   0+0   0+0         0+0     never     00:00:00  all any all any all flow 32768&261632
29   0+0   0+0   0+0         0+0     never     00:00:00  all any all any all flow 5201
30   0+0   0+0   360+256420  5+2268  00:00:01  00:00:00  all any all any all

So I was wondering if there is something regarding fragmentation or something that causes this mismatching in the values, I would expect to have 1k packets on the P4 switch in this case. I saw the same behaviour if I use the flag -n to send 1000 bytes:

root@itcs-p4srv-02:/home/mmisamor# iperf3 -c 2001:1458:301:cd::100:3d8 -L 32772 -p 5204 -i 10 -n 1000 &
[1] 74722

root@itcs-p4srv-02:/home/mmisamor# Connecting to host 2001:1458:301:cd::100:3d8, port 5204
[  5] local 2001:67c:2c4:1::2 port 45908 connected to 2001:1458:301:cd::100:3d8 port 5204
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-0.00   sec   106 KBytes  7.06 Gbits/sec    0   13.9 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-0.00   sec   106 KBytes  7.06 Gbits/sec    0             sender
[  5]   0.00-0.00   sec  13.9 KBytes   105 Mbits/sec                  receiver

iperf Done.

I received 900 bytes:

E513-E-YECWH-1#show access-list acl_all_ipv6_flowlabels
     tx          rx            timers
seq  byte  pack  byte    pack  last      timout    cfg
10   0+0   0+0   0+0     0+0   never     00:00:00  all any all any all flow 131076&261884
11   0+0   0+0   0+0     0+0   never     00:00:00  all any all any all flow 65540&261884
12   0+0   0+0   0+0     0+0   never     00:00:00  all any all any all flow 196612&261884
13   0+0   0+0   0+900   0+10  00:00:12  00:00:00  all any all any all flow 32772&261884
20   0+0   0+0   0+0     0+0   never     00:00:00  all any all any all flow 131072&261632
21   0+0   0+0   0+0     0+0   never     00:00:00  all any all any all flow 65536&261632
22   0+0   0+0   0+0     0+0   never     00:00:00  all any all any all flow 196608&261632
23   0+0   0+0   0+0     0+0   never     00:00:00  all any all any all flow 32768&261632
29   0+0   0+0   0+0     0+0   never     00:00:00  all any all any all flow 5201
30   0+0   0+0   0+4037  0+38  00:00:12  00:00:00  all any all any all

Best regards,

Carmen Misa






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