: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.
:
:FreeBSD performance numbers for the single disk test on the SATA controller
:are abysmal, but this is expected: the FreeBSD 8.2 kernel doesn't include
:an AHCI driver and uses the SATA disks in IDE compatibility mode.
:
:--
:Francois Tigeot
That could be a CAM configuration issue. Is this the arcmsr controller?
Try this: Change arcmsr.c's cam_sim_alloc() call from this:
acb->psim=cam_sim_alloc(arcmsr_action, arcmsr_poll, "arcmsr", acb, unit,
&acb->qbuffer_lock,
1,
ARCMSR_MAX_OUTSTANDING_CMD, devq);
To this:
acb->psim=cam_sim_alloc(arcmsr_action, arcmsr_poll, "arcmsr", acb, unit,
&acb->qbuffer_lock,
ARCMSR_MAX_OUTSTANDING_CMD,
ARCMSR_MAX_OUTSTANDING_CMD, devq);
-Matt