Feb 4, 2013 · It uses a full PCIe 5.0 x16 link, allowing for a theoretical bidirectional 32 GT/s, but with multiple TB of memory behind a buffer controller. In much the same way that companies …

Dec 10, 2020 · It is not "PCIE memory", but it is a memory device in the system that is accessible by other devices and therefore needs to be seen across the bus. It is entirely possible that the …

Dec 9, 2019 · Consider the alternative of having lots of DRAM for volatile memory like usual. The OS can use it for caching. You still could have a LVM cache disk, but maybe just a high …

Oct 22, 2012 · Your interpretation of the BAR setup is correct. Then how does it differ. The device's on board memory/registers usually is a special RAM, it may be bi-port RAM (when …

That if a PCI device wishes to transfer data to a memory address, that address must exist in actual system RAM (and is allocated during PCI configuration) and not virtual memory. So if a …

Oct 18, 2015 · The PCI/PCIe adapter can gain control of the bus, and compete for memory cycles. The CPU, the DMA controller and bus masters could all be competeing for memory …

Memory-mapped I/O uses the same address bus to address both memory and I/O devices – the memory and registers of the I/O devices are mapped to (associated with) address values. So …

Aug 9, 2017 · On x86 PCs, the memory space is shared in the system. System memory maps from the bottom up (0 -> xGB) & PCI memory space is in the upper part of system memory …

I understood that a PCI Express endpoint device may have some memory BAR mapped in the system memory (is it always RAM the system memory we are talking about?). I need to …

Jun 10, 2016 · Additionally, this will generally be a physical memory address, not a virtual memory address. The Linux kernel will arbitrate access to these devices with functions such as mmap() …