Thanks Quinn - that is a relief! (also Thanks for that link!). So if I want to simply send this app for internal testing (without the Developer ID signature) to other Macs - is it still possible (without having to add each Mac to the provisioning profile first)? I think I don't quite understand the role of having a provisioning profile with Developer ID apps. If you can point to some reference that explain this - it would be useful. Thanks. Devendra.

Hi Quinn, Thanks - yes I'm using the System Trace Instrument. Since this happens on a remote Mac (which doesn't have/want to install Xcode), I'm using ktrace (artrace) to capture a trace which includes the system trace and am using Instruments to analyze this. It would be nice to have taskinfo provide more details about the thread states, but I may be able to get by without it. Thanks for your help and suggestions. Will open the DTS incident if we need to go there. Devendra.

I'm trying to investigate problems related to performance with our Kernel Extension. This is an audio over ethernet solution, so it involves threads with time-constrained (realtime) priority and the network interface drivers. Thanks. Devendra. ps: I realize we need to move out of the kernel using NWEthernetChannel for our protocol, but we're waiting for Apple to provide a way to receive (and send) packets in realtime priority in user mode (FB7733818).

Thanks Quinn - I'm back to working on this - will give it a try now. Will it make a difference if I'm using dispatchgetglobalqueue(QOSCLASSUSERINITIATED, 0) instead of the main queue? Devendra.