Linux – REDS blog

Share a block device between two nodes with OCFS2

November 11, 2024

Sometimes it can be useful to share a single block device (e.g., HDD or SSD) between multiple nodes (e.g., Linux OSes) with a coherent file system. So that modifications to files on the shared block device by one node are visible to another node. Such file system is called a clustered file system. The difference with a distributed file system is that all the data lies into the single block device, whereas in a distributed file system data is distributed…

Benchmark of DMA between an FPGA and a Linux userspace on a Zynq

Context As part of a research project, the REDS was mandated to design a system retrieving a data stream from a camera and transferring it to a CPU with the lowest delay. We used a SoC-FPGA board from Xilinx’s Zynq family. This type of device has a CPU core (PS) and a programmable FPGA part (PL). The solution chosen, to meet the need for high throughput, was to use a DMA. This was implemented in the FPGA part (PL) and…