龙芯处理器上的TLB性能优化技术

TLB(translation look-aside buffer)是分页式虚拟存储系统用于加速虚实地址转换的必不可少的性能优化部件.TLB处于访存的关键路径上,对系统性能有着至关重要的影响.同时TLB失效开销大,是龙芯处理器的系统性能瓶颈.因此,优化系统TLB的性能对于龙芯处理器系统性能的提升意义重大.实现了龙芯处理器上通过减少TLB失效次数以及降低TLB失效开销的TLB性能优化方法而分别采用的超页技术和软TLB技术,以及结合龙芯3号处理器新增的锁L2cache功能,进一步优化了的软TLB技术.

Implementation of VxWorks in autopilot for micro aerial vehicle based on PXA255 and FPGA

The overall hardware construction of autopilot within micro aerial vehicle is presented. The boot process of VxWorks real time operating system as well as the conception and function of board support package （BSP） is described. And the transplantation process of the VxWroks operat ing system into the hardware platform mentioned above is highlighted. It is shown from the final re sults that VxWorks has high stability and real time performance, ensuring accurate flight control and a smooth flight of the micro aerial vehicle.