Embedded Performance Engineering
Peripheral Clock 분석 — PLL·Divider·Gating·DVFS
PLL/divider/gating으로 peripheral clock. STM32 RCC, Linux CCF. Power vs Performance.
· 4분 읽기
clock peripheral
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Embedded Performance Engineering
MMIO 접근 성능 — Cache Policy·Write-Combining·Volatile·Barrier
MMIO uncached strongly-ordered. Write-combining for PCIe BAR. Volatile, DMB·DSB·ISB.
· 4분 읽기
mmio register
Embedded Performance Engineering
Interrupt Storm 처리 — NAPI·Rate-Limit·Polling 전환
IRQ flooding으로 main loop 봉쇄. NAPI 패턴, rate limit, interrupt coalescing.
· 4분 읽기
interrupt storm
Embedded Performance Engineering
Interrupt Latency 분석 — 진입·종료·Tail-Chaining·Late Arrival
Cortex-M 12-cycle latency. Tail-chaining 6-cycle. Late arrival, lazy stacking, FreeRTOS hooks.
· 4분 읽기
interrupt latency
Embedded Performance Engineering
DMA vs CPU Copy 성능 비교 — Break-even·Setup Overhead 실측
DMA setup overhead. CPU memcpy 최적화. Break-even size. 실측 데이터.
· 6분 읽기
dma memcpy
Embedded Performance Engineering
DMA 성능 최적화 — Burst·Scatter-Gather·Chain·Cache 일관성
Burst size 최적화. Scatter-gather, chain. Cache clean/invalidate, double buffer.
· 5분 읽기
dma burst
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
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