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Top Forums Programming TCP trashing data on application close Post 302455868 by metrix on Wednesday 22nd of September 2010 05:15:34 PM
Old 09-22-2010
I modified my code to use poll to wait for data from sockets and commented out the ioctl() call and added poll() calls so that I wouldn't have to worry about waiting indefinitely on readable data to show up on the port which appears to have fixed my problem!

Thank you,
Brandon

---------- Post updated at 04:15 PM ---------- Previous update was at 02:12 PM ----------

Removing ioctl didn't fix the problem, the data just makes it to the port randomly now..
I see something on Wikipedia under TCP about close() on a port with data still in the queue, but it doesn't have a reference to how to fix the issue (I would post a link, but I haven't posted 5 articles yet!)
 

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IBV_UD_PINGPONG(1)						   USER COMMANDS						IBV_UD_PINGPONG(1)

NAME
ibv_ud_pingpong - simple InfiniBand UD transport test SYNOPSIS
ibv_ud_pingpong [-p port] [-d device] [-i ib port] [-s size] [-r rx depth] [-n iters] [-l sl] [-e] HOSTNAME ibv_ud_pingpong [-p port] [-d device] [-i ib port] [-s size] [-r rx depth] [-n iters] [-l sl] [-e] DESCRIPTION
Run a simple ping-pong test over InfiniBand via the unreliable datagram (UD) transport. OPTIONS
-p, --port=PORT use TCP port PORT for initial synchronization (default 18515) -d, --ib-dev=DEVICE use IB device DEVICE (default first device found) -i, --ib-port=PORT use IB port PORT (default port 1) -s, --size=SIZE ping-pong messages of size SIZE (default 2048) -r, --rx-depth=DEPTH post DEPTH receives at a time (default 500) -n, --iters=ITERS perform ITERS message exchanges (default 1000) -l, --sl=SL send messages with service level SL (default 0) -e, --events sleep while waiting for work completion events (default is to poll for completions) SEE ALSO
ibv_rc_pingpong(1), ibv_uc_pingpong(1), ibv_srq_pingpong(1) AUTHORS
Roland Dreier <rolandd@cisco.com> BUGS
The network synchronization between client and server instances is weak, and does not prevent incompatible options from being used on the two instances. The method used for retrieving work completions is not strictly correct, and race conditions may cause failures on some systems. libibverbs August 30, 2005 IBV_UD_PINGPONG(1)
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