K 10
svn:author
V 6
tuexen
K 8
svn:date
V 27
2017-08-09T13:26:12.309646Z
K 7
svn:log
V 504
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

END