Messages in this thread | | | From | "Adam Flizikowski" <> | Subject | 8139_tx_interrupt - Tx time | Date | Fri, 10 Oct 2003 14:52:13 +0200 |
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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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