Decided to apply the patch proposed in -current by Mikolaj Golub:
http://people.freebsd.org/~trociny/uipc_socket.c.patch
This apparently fixed my issue as well. Running without checksums for a
full bonnie++ run (~100GB write/rewrite) produced no disconnects, no
stalls and generated up to 280MB/sec (4 drives in stripped zpool).
Interestingly, the hast devices write latency as observed by gstat was
under 30ms.
I believe this fix should be committed.
Here are the accumulated netstat -s from both hosts, for comparison with
previous runs. Retransmits etc are much less.
http://news.digsys.bg/~admin/hast/test3jun-fix/b1a-netstat-s
http://news.digsys.bg/~admin/hast/test3jun-fix/b1b-netstat-s
http://news.digsys.bg/~admin/hast/test3jun-fix/b1b-systat-if-fix
Before applying the patch I verified there are no network problems.
Created 1TB file from /dev/random on the first host. Copied over to the
second host with ftp. Transfer speed was low, at 80MB/sec -- ftp would
utilize one CPU core 100% at the receiving node. Then calculated md5
checksums on both sides, matched.
Daniel
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