[Bug 280386] if_bridge throws output errors under load

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280386

--- Comment #2 from pascal.guitierrez@gmail.com ---
(In reply to Zhenlei Huang from comment #1)

Thanks for your response.

Just ran the tests again.
There are no dropped packets detected even though the Oerr count is increasing,
see below for netstat -di output:

Name      Mtu Network         Address                Ipkts Ierrs Idrop     
Opkts Oerrs  Coll  Drop
igb0     1500 <Link#1>        5c:ed:8c:e9:c2:48   91053412     0     0  
78158209     0     0     0 
igb1*    1500 <Link#2>        5c:ed:8c:e9:c2:49          0     0     0         
0     0     0     0 
igb2*    1500 <Link#3>        5c:ed:8c:e9:c2:4a          0     0     0         
0     0     0     0 
igb3*    1500 <Link#4>        5c:ed:8c:e9:c2:4b          0     0     0         
0     0     0     0 
lo0     16384 <Link#5>        lo0                    62786     0     0     
62786     0     0     0 
lo0         - localhost       localhost                  0     -     -         
0     -     -     - 
lo0         - fe80::%lo0/64   fe80::1%lo0                0     -     -         
0     -     -     - 
lo0         - your-net        localhost              62786     -     -     
62786     -     -     - 
bridge0  1500 <Link#6>        58:9c:fc:00:07:00  168029633     0     0 
168394069 269681     0     0 
bridge0     - 192.168.0.0/24  192.168.0.150         719881     -     -   
1307016     -     -     - 
ue0      1500 <Link#7>        72:84:d1:bf:ad:2f       8907     0     0      
8908     0     0     0 
ue0         - 16.1.15.0/30    16.1.15.2               8208     -     -      
8208     -     -     -


Here is the relevant ifconfig:

igb0: flags=1008943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST,LOWER_UP>
metric 0 mtu 1500
       
options=4a520b9<RXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,WOL_MAGIC,VLAN_HWFILTER,VLAN_HWTSO,RXCSUM_IPV6,HWSTATS,MEXTPG>
        ether 5c:ed:8c:e9:c2:48
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>

bridge0: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric
0 mtu 1500
        options=0
        ether 58:9c:fc:00:07:00
        inet 192.168.0.150 netmask 0xffffff00 broadcast 192.168.0.255
        id 00:00:00:00:00:00 priority 32768 hellotime 2 fwddelay 15
        maxage 20 holdcnt 6 proto rstp maxaddr 2000 timeout 1200
        root id 00:00:00:00:00:00 priority 32768 ifcost 0 port 0
        member: igb0 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 1 priority 128 path cost 55
        groups: bridge vm-switch viid-4c918@
        nd6 options=9<PERFORMNUD,IFDISABLED>

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