[Bug 218894] Network dropouts on em(4) due to jumbo cluster failures

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Tue Nov 6 03:18:09 UTC 2018


https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218894

--- Comment #3 from Kaho Toshikazu <kaho at elam.kais.kyoto-u.ac.jp> ---
(In reply to Mike Andrews from comment #2)

I don't know the patch resolves the problems originally reported in this PR.
82574L is very slow, but "netstat -m" shows "0/0/0 requests for jumbo clusters
denied" with/without the patch. 

At least, PBA and high/low-water setting for I21[789] is broken because of 
receive buffer size is too small to save JUMBO frames. PBA should be calculated
from MTU, and high/low-water should be calculated from PBA instead of loading
immediate values, I think.

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