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MFC r317208:

Description

MFC r317208:

Syncoockies can be used in combination with the syncache. If the cache
overflows, syncookies are used.
This patch restricts the usage of syncookies in this case: accept
syncookies only if there was an overflow of the syncache recently.
This mitigates a problem reported in PR217637, where is syncookie was
accepted without any recent drops.
Thanks to glebius@ for suggesting an improvement.

PR: 217637
Reviewed by: gnn, glebius
Differential Revision: https://reviews.freebsd.org/D10272

Details

Provenance
tuexenAuthored on
Reviewer
gnn
Differential Revision
D10272: Improve handling of syncookies
Parents
rS319399: MFC r316743:
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