8139_tx_interrupt - Tx time

[Adam Flizikowski]

Hi,

I am trying to find out how long it takes to push packet off the NIC in
8139_tx_interrupt(){} (kernel 2.4.20)

but i don't know how to identify packet in this loop - i know that "entry"
stands for the packet but in the loop underneath:
/* code snippet for 8139_tx_interrupt(){}*/

1726         while (tx_left > 0) {
1727                 int entry = dirty_tx % NUM_TX_DESC;
1728                 int txstatus;

...

1762
1763                 dirty_tx++;
1764                 tx_left--;    // <- is single packet sent just
here??????
1765         }

what "tx_left" and "dirty_tx" variables stand for? Is single iteration
through the loop (lines 1726-1765) related to SINGLE packet transmission?

I wanted to put some probes inside tx_interrupt but not sure where it should
start/stop measuring to show single packet transmission time.


regards

adam

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