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I have a Windows 7 64-bit machine with two separate applications running on the same machine. One application writes data via 4 TCP connections (same IP, different ports). The other application reads that data. All of this is internal to the machine, although it is hooked up to a network.

The data, about 8MB aggregate, gets written every second. Individual message sizes are anywhere from 50KB to ~60KB. 10-15 of these messages are sent on each socket once a second. This means that one of the connections is dumping 5Mbytes all at once (loosely speaking), every second.

I have set the following options:

netsh int tcp set heuristics disabled

I used setsockopts to set the Receive buffer to 8Mbytes on the loaded connection and 2Mbytes on the connections with less of a data dump.

Finally, the questions:

  1. Is this the correct way to approach this? There are lots of docs out there for WinXP, but not so much for Win7.
  2. The 3 connections with less data are doing fine, but the 5Mbyte one occasionally either times out or errors out saying the system had to close the connection.
  3. I think from what I've read there is a 16MB limit on the receive window. Is this for all connections, or available for each connection?
  4. If per connection, can I set each connection to a different receive window size?
  5. And last but not least, I'm setting the transmit buffer the same as the receive buffer via setsockopts. Is this doing anything?
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closed as off-topic by Falcon Momot, mdpc, Jacob, Ward, Stephane Jun 26 '13 at 12:52

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Questions about software development are off-topic here, but can be asked on Stack Overflow." – Falcon Momot, mdpc, Jacob, Stephane
If this question can be reworded to fit the rules in the help center, please edit the question.

Is this question about an application that you are programming? I'm thinking this question might need to be migrated to stackoverflow. – cmorse Dec 29 '11 at 17:13

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