[Bug 280386] if_bridge throws output errors under load

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

--- Comment #16 from pascal.guitierrez@gmail.com ---
(In reply to Kevin Bowling from comment #15)

Thanks Kevin

no bridge filtering is enabled (sysctl net.link.bridge):

net.link.bridge.ipfw: 0
net.link.bridge.log_mac_flap: 1
net.link.bridge.allow_llz_overlap: 0
net.link.bridge.inherit_mac: 0
net.link.bridge.log_stp: 0
net.link.bridge.pfil_local_phys: 0
net.link.bridge.pfil_member: 0
net.link.bridge.ipfw_arp: 0
net.link.bridge.pfil_bridge: 0
net.link.bridge.pfil_onlyip: 1

and system does not appear to be CPU constrained, here's top -PSH below during
test run using iperf -P4:

last pid: 25350;  load averages:  0.19,  0.25,  0.28                           
                                                       up 4+19:09:14  11:32:05
321 threads:   5 running, 301 sleeping, 15 waiting
CPU 0:  0.0% user,  0.0% nice,  5.9% system,  0.0% interrupt, 94.1% idle
CPU 1:  0.0% user,  0.0% nice,  4.3% system,  0.0% interrupt, 95.7% idle
CPU 2:  0.4% user,  0.0% nice,  7.5% system,  0.0% interrupt, 92.1% idle
CPU 3:  0.0% user,  0.0% nice,  6.7% system,  0.0% interrupt, 93.3% idle
Mem: 16M Active, 24M Inact, 1744K Laundry, 6786M Wired, 8656M Free
ARC: 5248M Total, 854M MFU, 3834M MRU, 537M Header, 22M Other
     4644M Compressed, 6394M Uncompressed, 1.38:1 Ratio

  PID USERNAME    PRI NICE   SIZE    RES STATE    C   TIME    WCPU COMMAND
   11 root        187 ki31     0B    64K CPU0     0 108.9H  93.56% idle{idle:
cpu0}
   11 root        187 ki31     0B    64K CPU1     1 107.8H  93.47% idle{idle:
cpu1}
   11 root        187 ki31     0B    64K CPU3     3 108.0H  91.74% idle{idle:
cpu3}
   11 root        187 ki31     0B    64K RUN      2 107.7H  91.54% idle{idle:
cpu2}
25350 root         24    0    20M  7800K sbwait   3   0:00   7.80%
iperf3{iperf3}
25350 root         23    0    20M  7800K sbwait   0   0:00   7.31%
iperf3{iperf3}
    0 root        -60    -     0B  2096K -        1   1:20   5.95%
kernel{if_io_tqg_1}
    0 root        -60    -     0B  2096K -        0   3:59   5.83%
kernel{if_io_tqg_0}
25350 root         21    0    20M  7800K sbwait   3   0:00   1.29%
iperf3{iperf3}
25350 root         21    0    20M  7800K sbwait   3   0:00   1.18%
iperf3{iperf3}

drops are only seen when using if_bridge:

dev.igb.0.iflib.txq3.r_drops: 4594 <-- this value is increasing during the
above test run
dev.igb.0.iflib.txq2.r_drops: 563
dev.igb.0.iflib.txq1.r_drops: 2551
dev.igb.0.iflib.txq0.r_drops: 2625

The value for "Oerrs" on the bridge0 device appears to increase in tandem with
the r_drop value:

Name      Mtu Network         Address                Ipkts Ierrs Idrop     
Opkts Oerrs  Coll  Drop
igb0     1500 <Link#1>        5c:ed:8c:e9:c2:48   81252823     0     0 
131980027     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                    62021     0     0     
62021     0     0     0 
lo0         - localhost       localhost                  0     -     -         
0     -     -     - 
lo0         - fe80::%lo0/64   fe80::1%lo0                0     -     -         
0     -     -     - 
lo0         - your-net        localhost              62021     -     -     
62021     -     -     - 
bridge0  1500 <Link#6>        58:9c:fc:00:07:00  122336886     0     0 
199687836 287872     0     0 
bridge0     - 192.168.0.0/24  192.168.0.150       13289878     -     -  
90898935     -     -     -

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