对于连续的MMIO 空间访问,可以通过支持write combine的方式( mmap_wc() )来提升性能。 Ø为什么需要使用PCIe DMA,在设备与主机间搬运数据? PCIe DMA 能够实现高性能的数据搬运。 1.CPU 仅需要配置DMA Engine, 大块的数据搬运过程无需CPU参与,CPU占用率低; 2.DMA Engine 是全硬件化的通信方式,TLP payload 大o...
对此的封装函数是io_remap_pfn_range或者remap_pfn_range(两者在 x86 和 ARM 上都是等效的),具体的实现同 ioremap 类似,也是建立各级页表。 由于MMIO 的属性多样,也是需要通过设置来明确,与「内核态映射」稍有不同的是,其 type 设置使用了单独的 wrapper,而不是作为映射函数的 suffix。以write combine属性为例,...
对于连续的MMIO 空间访问,可以通过支持write combine的方式( mmap_wc() )来提升性能。 Ø为什么需要使用PCIe DMA,在设备与主机间搬运数据? PCIe DMA 能够实现高性能的数据搬运。 1.CPU 仅需要配置DMA Engine, 大块的数据搬运过程无需CPU参与,CPU占用率低; 2.DMA Engine 是全硬件化的通信方式,TLP payload 大o...
62 UINT64 AllocationAttributes; ///< Allocation attributes. 63 ///< Refer to EFI_PCI_HOST_BRIDGE_COMBINE_MEM_PMEM and 64 ///< EFI_PCI_HOST_BRIDGE_MEM64_DECODE used by GetAllocAttributes() 65 ///< in EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL. 66 PCI_ROOT_BRIDGE_APERTURE Bus; ...
CPU: Testing write buffer coherency: ok devtmpfs: initialized omap_voltage_early_init: voltage driver support not added regulator: core version 0.5 regulator: dummy: NET: Registered protocol family 16 omap_voltage_domain_lookup: Voltage driver init not yet happened.Faulting!
CPU: Testing write buffer coherency: ok devtmpfs: initialized omap_voltage_early_init: voltage driver support not added regulator: core version 0.5 regulator: dummy: NET: Registered protocol family 16 omap_voltage_domain_lookup: Voltage driver init not yet happened.Faulting!
Combine that with an industry standard five-year warranty / 600TBW rating (terabytes that can be written) per TB, and you’re looking at probably the best PCIe 4.0 SSD for average users as well as gamers. WD SN5000 NVMe SSD – Best budget PCIe 4.0 SSD ...
Combine performance and durability with the advanced features of our P5 Plus, including industry-leading NAND, innovative controller technology, adaptive thermal protection, dynamic write acceleration, error correction, and encryption capability. All Crucial SSDs also come with our Storage Executive and fr...
· Switches must track the state of the four INTx signals independently for each Downstream Port and combine the states for the Upstream Port. · The Root Complex must track the state of the four INTx lines independently and convert them into system interrupts in an implementation‐specific way...
Cat 6a cabling, to meet your network needs without an overhaul of your infrastructure wiring, or a costly upgrade to fiber. The 10 Gbps network card also offers compatibility with VMWare® ESXi and Microsoft Hyper-V® virtualization software and iSCSI support to combine LAN and SAN functions...