I have loaded PC with e100 network cards. Since load reached 50Mbit/s + compression software, PC was not able to handle the load (because of weak CPU i think). I start digging the problem, and after i turn ethtool -s eth1 msglvl 256 i so message in dmesg [4296026.422000] e100: eth1: e100_xmit_frame: No space for CB In the same time there is no errors, dropped packets or etc on eth1 But actually, packets forwarded from tun(tap) device dropped, and that drops is not shown in any statistic. I did "ip link set eth1 txqueuelen 10000" and problems is solved. I have looked in e100 driver: case -ENOSPC: /* We queued the skb, but now we're out of space. */ DPRINTK(TX_ERR, DEBUG, "No space for CB\n"); netif_stop_queue(netdev); break; Seems it is hitting this rule. My question, is any person can suggest in kernel maillist to show packets dropped by ENOSPC in ifconfig or netstat -s ?
I forgot to mention today i did emerge of latest kernel 2.6.16-gentoo-r9
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