qt network performance

[criss]

hi to all,

i'm using qt 4.1.x with vs7.1 (2003 version) on winxp.

i've coded the following: a (qtcp)server and clients over qtcpsocket. both are gui applications (because of easier displaying any data . the server "accepts" clients, holts on-/offline status of all clients (ok, at the moment just 2), sends data from one client (lets say generator-client) to the other client (consumer-client). for each client/server connection i'm opening only one qtcpsocket with readwrite access. using a start-command the generator-client produces some double values, until the server send a stop-command. for sending/receiving data to/from a socket, i'm using a qdatastream. all send operations are finished with a flush().

now, the generator is sending every 5ms 3 double values to the server and the server forwards it to the consumer. when i run everything on one pc, everything works fine. all data are fast received.

but if i'm using for example 2 pc's (connected over a 100mbit hub/switch, nothing else), whereas the server/clients are started in different combinations on the pc's, then only 5-7 (approx all 20ms) messages are received form the server. the rest is getting lost.

what i'm or qt (also read posts about qt's performance problems) or windows is making wrong? i need all information, that is produced through my generator-client. will be the transfer using udp packages faster? should i use fewer socket-connections (one for read only, one for write only)? should i use another network package (winsock, raknet, ...) than qnetwork?

any hint would be appreciated?

regards

criss