Intel® I/O Acceleration Technology
Improve network application responsiveness with more efficient data movement and reduced system overhead. Today's multi-port GbE and 10GbE network adapters deliver enormous data flows that require advanced server I/O subsystems to avoid performance bottlenecks.
Intel® I/O Acceleration Technology (Intel® I/OAT), a component of Intel® Virtualization Technology for Connectivity, improves data flow across the platform to enhance system performance.
I/O acceleration for consolidated workloads
Server consolidation requires large numbers of virtual machines (VMs) per physical server. Intel I/OAT helps ensure that the resulting data traffic doesn't overwhelm server I/O:
- Throughput: Improves CPU-network interface integration for better memory-copy performance
- Scalability: Increases control over interrupt processing, including prioritization and resource allocation
- Efficiency: Provides an alternative to interrupt and system-to-user memory copy operations for each packet
Together, these capabilities work in concert to address data-flow bottlenecks across the platform.
An integrated suite of performance features
Intel I/OAT is actually a set of technologies that each contributes to increased performance.
The features of Intel I/OAT enhance data acceleration across the computing platform:
- Intel® QuickData Technology enables data copy by the chipset instead of the CPU, to move data more efficiently through the server and provide fast, scalable, and reliable throughput.
- Direct Cache Access (DCA) allows a capable I/O device, such as a network controller, to place data directly into CPU cache, reducing cache misses and improving application response times.
- Extended Message Signaled Interrupts (MSI-X) distributes I/O interrupts to multiple CPUs and cores, for higher efficiency, better CPU utilization, and higher application performance.
- Receive Side Coalescing (RSC) aggregates packets from the same TCP/IP flow into one larger packet, reducing per-packet processing costs for faster TCP/IP processing.
- Low Latency Interrupts tune interrupt interval times depending on the latency sensitivity of the data, using criteria such as port number or packet size, for higher processing efficiency.
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