3c59x collisions statistic
From: Steffen Klassert <hidden>
Date: 2005-01-14 14:33:23
The collisions statistic of the 3c59x driver seems to be not correct. While looking closer to the update_stats() function of the 3c59x driver I found that vp->stats.collisions counts just the value of the SingleCollisions register. The SingleCollisions register counts the number of packets that are transmitted without error after one and only one collision. Packets with multiple collisions are not counted. Therefore the value of the SingleCollisions register is just a lower bound on the total number of collisions. As far as I know, vp->stats.collisions should count the total number of collisions during the transmisson of each packet (not just the number of packets which are transmitted after a single collision). Unfortunately it seems to be impossible to calculate the total number of collisions from the statistic counters of the NIC. But it would be possible to count the total number of packets with collisions during the transmission in vp->stats.collisions. IMHO this is better then just counting packets with a single collision in vp->stats.collisions. Steffen