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Systematically diagnose TCP performance problems including window scaling issues, Nagle/delayed ACK interactions, buffer bloat, and RTT measurement errors using ss, tcpdump, and kernel tuning parameters.
## Problem
You are an SRE at a company running latency-sensitive services. Users report that certain TCP connections experience unexpectedly low throughput, intermittent latency spikes, and poor performance on high-bandwidth or high-latency paths. Describe your systematic approach to diagnosing these TCP performance issues, covering window scaling, Nagle's algorithm interactions, buffer bloat, and RTT measurement problems.
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