why does net_dev.hard_start_xmit get called multiple times
with the same tcp packet?
TxMit: transmit function of the nic driver
TxIrq: packet transmission reported by nic
RxIrq: packet reception reported by nic
cpu clock-tick | event | Tcp SeqNo | Tcp AckNo
---------------|-------|-----------|----------
0x186dce194bc8 | TxMit | 909902971 | 0
0x186dce1beb05 | TxIrq | 909902971 | 0
0x186dce1ef8f8 | RxIrq | 897283491 | 909902972
0x186dce1f8b03 | TxMit | 909902972 | 897283492
0x186dce220317 | TxIrq | 909902972 | 897283492
0x186dce3002e8 | RxIrq | 897283492 | 909902972
0x186dce308560 | TxMit | 909902972 | 897283515 <- dublicate
0x186dce330bab | TxIrq | 909902972 | 897283515
0x186dce3c09bf | TxMit | 909902972 | 897283515 <- dublicate
0x186dce3e9b6f | TxIrq | 909902972 | 897283515
0x186dce424310 | RxIrq | 897283515 | 909902994
0x186dce47bc44 | RxIrq | 897283515 | 909902994
0x186dcf094683 | TxMit | 909902994 | 897283791
0x186dcf0bcafb | TxIrq | 909902994 | 897283791
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