may some issue related to lo0 or socket

[k simon]

Hi,lists,
  I ran a forward squid instance and a haproxy instanse on one FreeBSD
9.1 box, it's works fine. When I upgraded it to 10-stable, I found I
can't buffer videos normally unless I set "tcp_recv_bufsize" to a higher
value, eg. 32768.
  The squid instance forward http request to the haproxy and accept the
response from the haproxy via lo0. I think maybe there is some issue, I
have tried upgraded the os to r264098 and disable lo0's csum, but it's
not helped. How can I investigate the issue deeply ?


Regards
Simon