If TCP children are busy, Please correct me if I am wrong if the remote IP is not responding via TCP protocol, this leads to a timeout and this child is busy. If many remote endpoints are not reachable via TCP this can lead to the case when half or more children are by timeout operations.
I think required to monitor how many children are busy. Is it possible to get such info using kamcmd utility, statistics module, or xprom module.
Sergey