brest.fr

NAND flash memory integration in the traditional I/O soft-ware stack of Unix-like operating systems (OS) was achieved without modifying most of the OS layers. In fact, one can dissociate two categories of flash memory devices: (1) those which intricacies are abstracted to the OS (e.g. SSDs, USB sticks), and (2) raw flash memory chips driven by a spe-cific Flash File System (FFS) such as JFFS2 and UBIFS. In the latter case, the operating system I/O software stack low level layers (i.e. file system and driver) were upgraded while the higher levels (virtual file system and related buffers) were not. In order to optimize the system behavior in such a case, one must understand the interactions between the different I/O software management layers, and the perfor-mance impact of each layer for a given I/O workload. For this sake, we developed a tracing toolset allowing to under-stand the impact of each layer on the I/O request flow, for instance: caching, overheads, and fragmentation. The de-veloped framework proved to be precious to apprehend the interactions between OS flash specific layers and traditional layers for a better system performance understanding