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OTSnd buffer size

What will be a "default" or close to "default" buffer size when I use the OTSnd call?

For example, if I have a large file (over 5 MB) and use connection-oriented base endingpoints, I tried 16K, 32K and 64K buffer size. It seems that I got more -3161 (kOTFlowErr) often on 16K other than 64K buffer size on a 10 Mbps network and almost no error on 100 Mbps network. Sometime, the -3161 took a while (more than few seconds) to clear when I have the T_GODATA callback event.

This is running a classic app on OS 10.2, OS 10.1. and OS 9.2.2.

I am using:

result = OTSnd(gConnectEndPoint, bufHandle+offset, bufferSize, T_MORE );

Thanks for any suggestion and help...

Michael Wu
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