> ## Documentation Index > Fetch the complete documentation index at: https://dragonwingdocs.qualcomm.com/llms.txt > Use this file to discover all available pages before exploring further. # Performance overview Optimize the performance of Qualcomm® Linux® with the following key areas: * Performance-impacting features such as the CPU scheduler, CPU frequency governor, dynamic voltage and frequency scaling (DVFS) governors, Userspace Resource Manager (URM), and memory. * Tools for performance analysis to identify and diagnose issues. * Configuration and customization options for Linux settings to achieve enhanced performance. * Troubleshooting methods to resolve performance-related problems. * Measurement procedures to evaluate system performance. * Performance dashboards for QCS6490, QCS5430, and Qualcomm Dragonwing™ IQ-615 for real-time insights. Qualcomm Linux is a single Linux distribution that works with many system-on-chips (SoCs) for development and evaluation kits. See [Hardware SoCs](https://dragonwingdocs.qualcomm.com/Hardware-SoCs) that are supported on Qualcomm Linux. The following guides contain supplementary information, such as device specifications, supported resource opcodes, chipset-specific configuration and customization settings, performance dashboards, and measurement procedures: * [Qualcomm Linux Performance Guide - Addendum for Qualcomm Dragonwing IQ-9075](https://docs.qualcomm.com/bundle/resource/topics/80-80023-10A/overview.html) * [Qualcomm Linux Performance Guide - Addendum for Qualcomm Dragonwing IQ-8275](https://docs.qualcomm.com/bundle/resource/topics/80-80023-10B/overview.html) ## **Subsystem dependencies** The performance of the software depends on the CPU, GPU, and DDR subsystems. Qualcomm Linux uses the Qualcomm® Kryo™ CPU, which has the following clusters: * Prime cluster for high-performance CPU cores. * Gold cluster for balanced power and performance. * Silver cluster for low-power CPU cores, ideal for light-weight applications. Cache memory is categorized into the following three levels: * L1 is the smallest and fastest cache level, storing both instructions (L1 I) and data (L1 D). * L2 and L3 are larger but slower cache levels, mainly for data storage. The following tables list the specifications for the subsystems on QCS6490, QCS5430, and Dragonwing IQ-615: **Table : Specifications for QCS6490 CPU, GPU, and DDR subsystems** | **Specifications** | **QCS6490** | | | | :-------------------: | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------: | ------------- | --------------- | | **Core type** | **Kryo Prime** | **Kryo Gold** | **Kryo Silver** | | Number of CPUs | 1 | 3 | 4 | | CPU maximum frequency | 2.7 GHz | 2.4 GHz | 1.9 GHz | | L1 I cache | 32 kB | 32 kB/core | 32 kB/core | | L1 D cache | 32 kB | 32 kB/core | 32 kB/core | | L2 cache | 256 kB | 256 kB/core | 128 kB/core | | L3 cache | 2 MB | | | | GPU | Qualcomm® Adreno™ 643 GPU | | | | GPU maximum frequency | 812 MHz | | | | DDRSS | - Supports dual-channel non-package-on-package high-speed LPDDR5/LPDDR4 SDRAM.
- LPDDR5 SDRAM is designed for a 3200 MHz clock (2 × 16‑bit).
- LPDDR4 SDRAM is designed for a 2133 MHz clock (2 × 16‑bit). | | | **Table : Specifications for QCS5430 (FP 1 and FP 2) CPU, GPU, and DDR subsystems** | **Specifications** | **QCS5430 FP 1 (feature pack 1)** | **QCS5430 FP 2** | | | | | :-------------------: | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------: | :--------------: | -------------- | ------------- | --------------- | | **Core type** | **Kryo Gold** | **Kryo Silver** | **Kryo Prime** | **Kryo Gold** | **Kryo Silver** | | Number of CPUs | 2 | 4 | 1 | 3 | 4 | | CPU maximum frequency | 2.1 GHz | 1.8 GHz | 2.2 GHz | 2.1 GHz | 1.8 GHz | | L1 I cache | 32 kB/core | 32 kB/core | 32 kB | 32 kB/core | 32 kB/core | | L2 cache | 256 kB/core | 128 kB/core | 256 kB | 256 kB/core | 128 kB/core | | L3 cache | 2 MB | | | | | | GPU | Qualcomm® Adreno™ 642L GPU | | | | | | GPU maximum frequency | 315 MHz | | | | | | DDRSS | - Supports dual-channel non-package-on-package high-speed LPDDR5/LPDDR4 SDRAM.
- LPDDR5 SDRAM is designed for a 3200 MHz clock (2 × 16‑bit).
- LPDDR4 SDRAM is designed for a 2133 MHz clock (2 × 16‑bit). | | | | | **Table : Specifications for QCS5430 (FP 2.5 and FP 3) CPU, GPU, and DDR subsystems** | **Specifications** | **QCS5430 FP 2.5** | **QCS5430 FP 3** | | | | | | :-------------------: | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------: | :--------------: | --------------- | -------------- | ------------- | --------------- | | **Core type** | **Kryo Prime** | **Kryo Gold** | **Kryo Silver** | **Kryo Prime** | **Kryo Gold** | **Kryo Silver** | | Number of CPUs | 1 | 3 | 4 | 1 | 3 | 4 | | CPU maximum frequency | 2.38 GHz | 2.4 GHz | 1.8 GHz | 2.38 GHz | 2.4 GHz | 1.8 GHz | | L1 I cache | 32 kB | 32 kB/core | 32 kB/core | 32 kB | 32 kB/core | 32 kB/core | | L2 cache | 256 kB | 256 kB/core | 128 kB/core | 256 kB | 256 kB/core | 128 kB/core | | L3 cache | 2 MB | | | | | | | GPU | Qualcomm Adreno 642L GPU | | | | | | | GPU maximum frequency | 550 MHz | | | | | | | DDRSS | - Supports dual-channel non-package-on-package high-speed LPDDR5/LPDDR4 SDRAM.
- LPDDR5 SDRAM is designed for a 3200 MHz clock (2 × 16‑bit).
- LPDDR4 SDRAM is designed for a 2133 MHz clock (2 × 16‑bit). | | | | | | **Table : Specifications for Dragonwing IQ-615 CPU, GPU, and DDR subsystems** | **Specifications** | **Dragonwing IQ-615** | | | :-------------------: | :------------------------------------------------------------: | --------------- | | **Core type** | **Kryo Gold** | **Kryo Silver** | | Number of CPUs | 2 | 6 | | CPU maximum frequency | 1.9 GHz | 1.6 GHz | | L1 I cache | 64 kB/core | 32 kB/core | | L1 D cache | 64 kB/core | 32 kB/core | | L2 cache | 256 kB/core | 64 kB/core | | L3 cache | 1 MB | | | GPU | Qualcomm® Adreno™ 612 GPU | | | GPU maximum frequency | 845 MHz | | | DDRSS | Two-channel high-speed memory – LPDDR4X (2 × 16‑bit) 1555 MHz. | | ## **Next steps** * [Get started with performance tuning and optimization](./get-started-with-performance-tuning-and-optimization) * [Prepare performance build](./get-started-with-performance-tuning-and-optimization#prepare-performance-build)