netdev - VLAN I/F's and TX queue.

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Date:	Mon, 3 May 2010 13:34:28 +0200
From:	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>
To:	netdev@...r.kernel.org
Subject: VLAN I/F's and TX queue.

We noted dropped pkgs on our VLAN interfaces and i stated to look
for a cause. Here is a ifconfig example:

eth0      Link encap:Ethernet  HWaddr 00:AA:BB:CC:DD:EE
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:8886910 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8880219 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:1626842951 (1.5 GiB)  TX bytes:1555540810 (1.4 GiB)

eth0.1    Link encap:Ethernet  HWaddr 00:AA:BB:CC:DD:EE
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2163164 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2161943 errors:0 dropped:98 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2467090557 (2.2 GiB)  TX bytes:2480246455 (2.3 GiB)

eth0.1.1  Link encap:Ethernet  HWaddr 00:AA:BB:CC:DD:EE
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2163164 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2161943 errors:0 dropped:98 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2458437901 (2.2 GiB)  TX bytes:2471598683 (2.3 GiB)

Here I note that txqueuelen is 0 for eth0.1/eth0.1.1 and 100 for eth0 and
that it is only eth0.1 and eth0.1.1 that drops pkgs. It feels as if eth0.1
bypasses eth0's tx queue and passes pkgs directly to the HW driver. Is that so?
If so, that feels a bit strange and I am not sure how to best
fix this. Any ides?

Using kernel 2.6.33

     Jocke

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