Performance Tuning

Measure, analyze, and engineer — not guess. Our Arm and RISC-V experts uncover the bottlenecks hiding deep across your stack and eliminate them with precision, delivering meaningful, measurable performance gains.
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Unlock the True Performance of Your Platform

Performance problems rarely originate where they appear. Root causes hide across cache behavior, compiler decisions, kernel scheduling, and NUMA imbalance. Development teams face challenges such as:
  • Bottlenecks buried across multiple layers of the stack
  • Hardware-specific behaviors not visible through normal profiling
  • Vector units (NEON, SVE, RVV) left underutilized
  • Kernel parameters and I/O paths configured for the wrong workload
  • NUMA systems creating cross-domain memory penalties
  • Complex CPU pipelines and memory subsystems that require microarchitectural expertise
  • Naive or over-zealous power management strategies

Diagnosing and resolving these issues requires deep knowledge of the hardware architecture, compilers, OS internals, and low-level performance measurement. RISCstar provides this expertise, delivering optimizations that are correct, stable, and measurable.

RISCstar's Approach to Performance Optimization

RISCstar follows a disciplined, cross-layer methodology that starts from system symptoms and drills progressively into root causes:
top-down

Top-Down Performance Analysis

We start at the macro level — system KPIs and workload behavior — tracing symptoms down through threads and hardware pipelines to target the highest-ROI optimizations.
static-analysis

Static Analysis & Code Path Examination

We profile and analyze source code patterns, compiler output, and memory access structures before touching runtime tools — uncovering inefficiencies early.

runtime

Runtime Dynamic Tracing

We capture detailed runtime events on live systems to diagnose complex or intermittent performance issues.
low-level

Low-Level Hardware & Microarchitectural Optimization

We tune at the lowest level: SVE, SVE2, and RVV vectorization; cache locality; NUMA-aware scheduling; and kernel stack tuning.

compile-time

Compile-Time Instrumentation

We instrument binaries at build time to gather execution counts and hot loops for targeted optimization.
benchmarking

Benchmarking & Validation

We validate improvements across real workloads and stress scenarios, ensuring results are correct, stable, and tied to your KPIs.

Optimization Success Stories

Our engineers have delivered significant performance wins across widely-used open source projects and production platforms. Examples include:

multimedia-codes

Multimedia Codecs (x264/x265)

Optimized critical kernels in open-source video codecs, accelerating H.264 and H.265 workloads used in streaming, media, and embedded systems
blas

BLAS Math Library (Fujitsu A64FX)

Implemented SVE-optimized BLAS routines delivering ~3.5× speedup in matrix multiplication using 512-bit SVE
xxhash

xxHash

Rewrote XXH3, XXH64, and XXH32 using Arm SVE and multi-buffer technology, achieving ~3–4× improvement in hashing throughput
cryptography

Cryptography (Arm)

Optimized SM3, SM4, RSA, and AES using Arm cryptographic extensions and SVE-based vectorization
intel

Intel IPsec-MB

Accelerated ZUC and SNOW algorithms using SIMD and multi-buffer techniques, substantially increasing cryptographic throughput for network workloads

Why RISCstar? 

When performance is on the line, you need experts who specialize in Arm and RISC-V — not generalists learning on the job.
  • Experience: All of our engineers bring over a decade of hands-on optimization experience, delivering measurable performance gains across Arm and RISC-V workloads.
  • Expertise: Cross-layer knowledge spanning hardware architecture, compilers, and OS internals, finding root causes, not symptoms, with optimizations tied to your KPIs.
  • Technical Depth: We tune at the lowest levels — SVE, SVE2, and RVV vectorization; cache locality; NUMA-aware scheduling — going deeper than compilers alone.
  • Methodology: We don't guess. We measure, analyze, and engineer using static analysis, dynamic tracing, and rigorous benchmarking to validate every improvement.

RISCstar, Your Partner for Success

RISCstar will help you get the most out of your Arm and RISC-V hardware, with measurable, validated results across the full stack. If you have:
  • an Arm or RISC-V platform that isn't delivering the performance your hardware is capable of
  • bottlenecks you've been unable to diagnose or resolve with your existing team, or
  • a product where power, throughput, or latency targets are at risk
We have extensive experience in these situations and are here to help.
Contact us to discuss your performance optimization needs.

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