FreeBSD 9.1 ix driver vlan problem

[Rumen Telbizov]

Hello Jack, list,

I've been dealing with a nagging problem for a day now and decided to ask a
quick question here.

Basically I am building a brand new FreeBSD 9.1-RELEASE router which has a
dual port fiber NIC (X520-SR2 10GbE Dual-Port Server Adapter (82599ES)
10GBASE-SR - LC). The network card is recognized fine by the ix driver and
overall works fine.

The issue is when I start adding vlans to this card. It seems like every
time I add a brand new vlan it "freezes" all the rest of the vlans already
configured on that one physical interface. I loose ping between my locally
connected peers.

Example:
ifconfig vlan200 create  # this is OK
ifconfig vlan200 inet 1.2.3.1/30  vlan 200 vlandev ix1 description DEBUG #
this second line makes the rest of the vlans freeze for 6-7 seconds

On the switch side (Juniper) the physical interface flaps. There's nothing
in logs/dmesg.

If I configure the above vlan on an em0 interface - things are just smooth.

I read some similar complaints that have surfaced in the past:
 * http://readlist.com/lists/freebsd.org/freebsd-net/5/26378.html
 * http://marc.info/?l=freebsd-net&m=130929760904438

Any idea what might be the problem? Any improvements in 9.2-RC4 in this
regards?

Thank you in advance,

-- 
Rumen Telbizov
Unix Systems Administrator <http://telbizov.com>