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Message: [QUOTE="Kevin McMurtrie, post: 4084932"] It happened today again during testing of a different server class on the same OS and hardware. This time it was under a microscope. There were 10 gigabytes of idle RAM, no DB contention, no tenured GC, no disk contention, and the total CPU was around 25%. There was no gridlock effect - it always involved one synchronized method that did not depend on other resources to complete. Throughput dropped to ~250 calls per second at a specific method for several seconds then it recovered. Then it happened again elsewhere, then recovered. After several minutes the server was at top speed again. We then pushed traffic until its 1Gbps Ethernet link saturated and there wasn't a trace of thread contention ever returning. [/QUOTE]