Now all is clear!! :-) Thanks, Emanuele Francois Piette ha scritto: >> The problem was on the receiver side. Inside DataAvailable there >> are onerous instructions for CPU. So winsock messages >> tend to accumulate in Message queue. >> When new packets arrive, the receiver progressively reduce >> TCP sliding window until 0. >> > > That is perfectly correct and expected behaviour. If receiver is not able to > process data quickly enough, sender has to pause sending. TCP window is > there to avoid congestion with not acknowledged data packets while avoiding > slow down because of round trip between sender and receiver. (Sending the > next packet only when previous one has been acknowledged would drastically > reduce thruput. The TCP window allow sender to send packet before having > received ACK, but at most to the size of the TCP window). > > Back to the receiver code: with such processing, no winsock message can > accumulate in the message queue. Only a single winsock message is posted in > the queue whatever data is received. And no more message will be posted by > winsock, even if more data comes in, until the application call Receive. > There is not one message per packet, there is one message per call to > receive (plus the initial message of course). > > At sender side, as TWSocket automatically buffer data, if you don't use > OnDataSent to know when to send more data and instead simply send everything > you have to send, you'll end up with all data in memory, in TWSocket send > buffer. This means that if you have lots of data to send, send chunk by > chunk (for example 4 or 8KB). Send next chunk when you receive OnDataSent > event. This will produce a continuous flow because you receive OnDataSent > when TWSocket has emptyed his buffer. At that time, winsock still has his > own buffer full and continue to send while you are fetching data from disk > or from elsewhere. > > Contribute to the SSL Effort. Visit http://www.overbyte.be/eng/ssl.html > -- > [EMAIL PROTECTED] > Author of ICS (Internet Component Suite, freeware) > Author of MidWare (Multi-tier framework, freeware) > http://www.overbyte.be > >
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