On Mon, Jul 11, 2011 at 10:19:37AM -0700, Matthew Dillon wrote: > :Disk performance should normally go up as the number of disk used increases > :(particularly for RAID0 setups), and this is the case on FreeBSD. > :Howewer, DragonFly seems to reach a plateau. The performance curve for writes > :is especially flat. > > That could be a CAM configuration issue. Is this the arcmsr controller?
It is: arcmsr0: <Areca SAS 6G Host Adapter RAID Controller (RAID6 capable)> port 0xe800-0xe8ff mem 0xfeb40000-0xfeb7ffff,0xfeb30000-0xfeb3ffff irq 28 at device 0.0 on pci3 > Try this: Change arcmsr.c's cam_sim_alloc() call from this: [...] > 1, [...] > To this: [...] > ARCMSR_MAX_OUTSTANDING_CMD, [...] Done, I'll start a new set of benchmarks with RAID0 configurations. -- Francois Tigeot
