[Bug 280074] em(4) temporarily hangs and re-enables TX CSUM if a bridge it's a member of is modified

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280074

--- Comment #28 from Joshua Kinard <[email protected]> ---
(In reply to Zhenlei Huang from comment #23)
> From my test with igc(4) from ssh session, after `ifconfig igc0 -txcsum` type ENTER every seconds,
> 
> [snip]
> 
> The ssh session stalls for about 6 seconds.

So this is actually expected behavior for 14.x and up, when em(4) and other
Intel chipsets were migrated to using iflib, or is this just a thing that got
missed initially and hasn't really had attention?


(In reply to Zhenlei Huang from comment #27)
> Can you also share the ifconfig before and after shutdown jail, and the dmesg ?
> I want to check whether the link of em0 is still flipping.

That is already posted in comment#22, per Kevin's request earlier.

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