> It would save me some research if you summarized what TCP_NODELAY
> actually does, or referenced a man page.
TCP_NODELAY
Turn the Nagle algorithm off. This means that pack-
ets are always sent as soon as possible and no
unnecessary delays are introduced, at the cost of
more packets in the network. Expects an integer
boolean flag.
The cost of more packets arises in two situations: A program does not
buffer and uses more write()s than needed and a program does not know
in advance if more data needs to be sent, like telnet now knowing if
the user continues to type fast.
Exim does its own buffering, so using the above option should only reduce
latency without generating more packets. The option is used like this:
#include <netinet/tcp.h>
int one=1;
setsockopt(sock,SOL_TCP,TCP_NODELAY,&one,sizeof(one));
Michael
