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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