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计算机系统整体性能的提高不仅仅依赖于处理器计算能力的提升也需要高性能芯片组的有力支持.芯片组承担着CPU和外围设备通信的重任,而且目前大多数系统中采用把内存控制器集成在北桥中的方法,这更加突出了北桥在访存性能以至于在整个系统中的关键作用.以高性能为目标,龙芯2C处理器配套北桥芯片NB2005的设计和优化采用了很多新的方法和技术,其中包括根据程序行为进行动态Page管理的内存控制电路,一种与内存控制电路状态相结合的预取策略和具备高吞吐量低延迟的PCI通道设计等.性能测试和分析表明,搭配NB2005的龙芯2C系统访存带宽要比搭配Marvell GT64240北桥的系统提高40%以上,运行SPECCPU2000浮点和定点程序的性能分别提高了12.2%和2.5%,磁盘I/O的性能也提高了30%.
The overall performance of computer systems to improve not only rely on the processor to improve computing power but also the strong support of high-performance chipsets.Chip set to undertake the task of CPU and peripheral communication, and most of the current system memory controller integration North Bridge in the method, which highlights the North Bridge in the memory performance of the system as a whole even in the key role to high performance as the goal, Loongson 2C processor Northbridge NB2005 supporting the design and optimization of a lot of new methods and Technology, including memory control circuits for dynamic Page management based on program behavior, a prefetch strategy combined with the state of memory control circuits, and PCI channel design with high throughput and low latency, etc. Performance tests and analysis show that with NB2005 The access speed of Godson 2C system was more than 40% higher than that of the system with Marvell GT64240 Northbridge. The performance of SPECCPU2000 floating-point and fixed-point programs increased by 12.2% and 2.5% respectively, and the performance of disk I / O was improved by 30%.