Hi I am fairly new to DTRACE and we want to check periodically the TCP queue length using the Dtrace. We have multiple modules(process) in our system and each communicate via TCP connections. We are suspecting TCP queue getting exhausted. We have set the TCP send/receive size using NDD to around 2MB. Now my purpose is to get the TCP queue length between any two given processes. I have tried using rwtop script from Dtrace_toolkit, however it only proivdes the total TCP R/W queue at any point and not at individual socket level. I request someone to share the script with which I can achieve above funcationality. Also I need to understand if DTRACE degrades system performance because of this probing and by what factor. We have live network and we do not want our load to be disturbed. My machine is Sun V445, 4CPU, 1.5Ghz. Regards Venkat "DISCLAIMER: This message is proprietary to Aricent and is intended solely for the use of the individual to whom it is addressed. It may contain privileged or confidential information and should not be circulated or used for any purpose other than for what it is intended. If you have received this message in error,please notify the originator immediately. If you are not the intended recipient, you are notified that you are strictly prohibited from using, copying, altering, or disclosing the contents of this message. Aricent accepts no responsibility for loss or damage arising from the use of the information transmitted by this email including damage from virus."