> > My company (Cybernetics) sells several products that run embedded Linux > > which use the userspace scatter-gather capability of the SG driver. > > They are still running the 2.4 kernel series, but we will probably > > switch to 2.6 at some point. > > What do they actually use it for? As in why is the data scattered even > in the virtual address space? One of our products is a RAID-like controller for SCSI tape drives. Parallel SCSI or iSCSI in via a target-mode SCSI driver and parallel SCSI, iSCSI, or FC out via the SG driver, with various functions in between for data buffering, emulation, striping, mirroring, etc. The program that controls everything has a complex internal buffering scheme that uses userspace scatter-gather for the main read/write I/O path to the tape drives. Anthony J. Battersby Cybernetics - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
