issue with the Nagle algorithm (TCP_NODELAY)

[Kantor Zsolt]

Hi,I'm working on some server/client application,and I have encountered some problems with
TCP_NODELAY (disabling the Nagle algorithm).if I disable the Nagle algorithm (TCP_NODELAY) and I
try to send 4 byte in TCP packets (in a loop) for instance, some packets still wait until reached
the MSS (my case 1440 bytes) and only after that are sent to the destination, why is this ? If the
Nagle algorithm is enabled (by default) all works fine, packets are sent after the MSS is reached,
but when Nagle algorithm is disabled the first 2 packets are sent with 4 bytes of data (in this
case) after that about 6 packets with maximum capacity (MMS) after that another 3 packets with 4
bytes . . .  and so  on the  process repeats.Why is  this  ? Because If I disable the Neagle
algorithm (with TCP_NODELAY) in a normal situation all sent packets should go out with the
specified data size (I'm using a 2.6.22 kernel)

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