[Bug 280386] if_bridge throws output errors under load

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

erwin.freebsd-bugzilla@bk3.nl changed:

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                 CC|                            |erwin.freebsd-bugzilla@bk3.
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--- Comment #12 from erwin.freebsd-bugzilla@bk3.nl ---
Could you try adding the following flags : -rxcsum -rxcsum6 -txcsum -txcsum6
-lro -tso -vlanhwtso -vlanhwfilter

I use this :

ifconfig_lagg0="laggproto lacp laggport igb0 laggport igb1 -rxcsum -rxcsum6
-txcsum -txcsum6 -lro -tso -vlanhwtso -vlanhwfilter"

I have a supermicro with an intel card with a hardware bug. This causes
extremely erratic but consistent slow connections. Took me ages to
troubleshoot. Had the same behavior under openindiana. Using the flags from
above I would get consistent linespeed.

igb0@pci0:0:20:0:       class=0x020000 rev=0x03 hdr=0x00 vendor=0x8086
device=0x1f41 subvendor=0x15d9 subdevice=0x1f41
    vendor     = 'Intel Corporation'
    device     = 'Ethernet Connection I354'
    class      = network
    subclass   = ethernet

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