syncache errors

[Mike Tancsa]

After upgrading to a recent STABLE, I have been seeing the following 
sporadic errors

Aug 28 04:15:15 smarthost2 kernel: TCP: [xx.yy.165.120]:53617 to 
[xx.yy.164.50]:25; syncache_socket: Socket create failed due to 
limits or memory shortage

this is with
FreeBSD 8.1-STABLE #7: Wed Aug 25 15:32:05 EDT 2010
and the previous kernel was from July 20th.

The odd thing is that the error is triggered from a RELENG_6 host 
only it would seem.  I noticed there are a number of syncache and tcp 
updates to RELENG_8, is it possible this is related ? I dont have any 
specific tweaks in /etc/sysctl.conf

other than
net.inet.tcp.log_in_vain: 1
net.inet.udp.log_in_vain: 1


net.inet.tcp.syncache.rst_on_sock_fail: 1
net.inet.tcp.syncache.rexmtlimit: 3
net.inet.tcp.syncache.hashsize: 512
net.inet.tcp.syncache.count: 0
net.inet.tcp.syncache.cachelimit: 15360
net.inet.tcp.syncache.bucketlimit: 30


         ---Mike


--------------------------------------------------------------------
Mike Tancsa,                                      tel +1 519 651 3400
Sentex Communications,                            mike at sentex.net
Providing Internet since 1994                    www.sentex.net
Cambridge, Ontario Canada                         www.sentex.net/mike