svn commit: r203889 - in stable/8/sys: cam cam/ata cam/scsi dev/ahci dev/asr dev/ata dev/ciss dev/hptiop dev/hptrr dev/mly dev/mpt dev/ppbus dev/siis dev/trm dev/twa dev/usb/storage

Lawrence Stewart lstewart at
Fri Feb 19 06:11:41 UTC 2010

Hi Matt,

On 02/19/10 02:53, Matthew Jacob wrote:
> Just a total swag here, but reduce the openings via camcontrol to < 32,
> or even < 16

Thanks for the suggestion. camcontrol doesn't seem able to futz with the 
mpt controller e.g.:

root at server# camcontrol identify da0 -v
(pass0:mpt0:0:2:0): ATAPI_IDENTIFY. ACB: a1 00 00 00 00 40 00 00 00 00 00 00
(pass0:mpt0:0:2:0): CAM status: CCB request was invalid

However, there does appear to be a relevant sysctl:

root at server# sysctl dev.mpt.0
dev.mpt.0.%desc: LSILogic SAS/SATA Adapter
dev.mpt.0.%driver: mpt
dev.mpt.0.%location: slot=3 function=0
dev.mpt.0.%pnpinfo: vendor=0x1000 device=0x0050 subvendor=0x1000 
subdevice=0x3060 class=0x010000
dev.mpt.0.%parent: pci2
dev.mpt.0.debug: 3
dev.mpt.0.role: 1
dev.mpt.0.vol_member_wce: NC
dev.mpt.0.vol_queue_depth: 128
dev.mpt.0.vol_resync_rate: 0
dev.mpt.0.nonoptimal_volumes: 0

Setting dev.mpt.0.vol_queue_depth=32, I can still trigger the
"mpt0: mpt_cam_event: 0x16" messages by doing an svn up on the src tree. 
Same if I set depth to 16, so unfortunately it doesn't seem to do help 
in this case.


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