Embedded Performance Engineering
Bus Contention 진단 — Arbitration·QoS·Starvation 측정
Round-robin·priority·QoS arbitration. Master 다수 시 starvation. AXI QoS·BUSY counter.
· 5분 읽기
bus contention
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Embedded Performance Engineering
임베디드 Bus Architecture — AHB·AXI·CHI 진화와 5-Channel
ARM AMBA — AHB·APB·AXI·ACE·CHI. AXI 5 channel, burst, outstanding transaction.
· 7분 읽기
bus ahb
Embedded Performance Engineering
PMU·HPM 하드웨어 카운터 분석 — 정밀 성능 진단
ARMv8 PMU 6+ counter, RISC-V HPM. CYCLE·INST_RETIRED·CACHE·BRANCH. perf 활용.
· 6분 읽기
pmu hardware-counter
Embedded Performance Engineering
SIMD·NEON 활용 — 128-bit Vector·Auto-Vectorization·SVE/SVE2
ARM NEON 128-bit, SVE 가변폭. Auto-vectorize (-O3). Intrinsics. Cortex-M Helium (MVE).
· 4분 읽기
simd neon
Embedded Performance Engineering
메모리 대역폭 분석 — STREAM·Roofline·Bus Saturation 측정
STREAM benchmark (Copy·Scale·Add·Triad). Roofline. PMU BUS_ACCESS · DDR bandwidth.
· 5분 읽기
memory bandwidth
Embedded Performance Engineering
Cache Line 최적화 — Alignment·Prefetch·False Sharing 처리
64-byte line alignment, software prefetch, false sharing 회피, SoA·AoS 선택.
· 4분 읽기
cache line
Embedded Performance Engineering
Cache Miss 3C Model 분석 — Compulsory·Capacity·Conflict
Cold/Compulsory, Capacity (working set > cache), Conflict (associativity 한계).
· 5분 읽기
cache miss
Embedded Performance Engineering
CPU Cache 기초 — L1·L2·L3·Set Associative·Replacement Policy
Cache hierarchy. Direct mapped vs N-way set associative. LRU·PLRU·Random.
· 6분 읽기
cache l1
Embedded Performance Engineering
Speculative Execution 분석 — OoO·Reorder Buffer·Register Renaming
Out-of-order execution. ROB·issue queue·rename. Spectre 측면. Cortex-A 사례.
· 5분 읽기
cpu speculative
Embedded Performance Engineering
Branch Prediction 분석 — Static·2-bit·BTB·BHT·Mispredict 비용
BTFNT, 2-bit saturating counter, BTB·BHT. Mispredict 10-20 cycle. PMU BR_MIS_PRED.
· 5분 읽기
cpu branch