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Difficulty: Hard
Category: networking
Practice quant interview questions from top firms including Jane Street, Citadel, Two Sigma, DE Shaw, and other leading quantitative finance companies.
Topics: af-xdp, umem, ring-buffer, networking, zero-copy, bit-manipulation, dpdk
AF_XDP (eXpress Data Path) provides high-performance packet processing by bypassing the kernel network stack. It uses a shared memory region (UMEM) with lock-free ring buffers, whose state is managed by monotonically increasing producer/consumer indices. In quantitative finance, HFT systems leverage this mechanism for sub-microsecond latency when processing millions of market data messages per second. Task Implement the function compute_umem_ring_stats(int ring_size, int producer, int consumer)
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