cam SCSI negotiation issues (mpt in that case), only 3.300MB/s transfers

Harald Schmalzbauer h.schmalzbauer at omnilan.de
Wed Dec 5 21:23:05 UTC 2012 

 schrieb Harald Schmalzbauer am 05.12.2012 21:04 (localtime):
>  schrieb Harald Schmalzbauer am 23.11.2012 14:39 (localtime):
>> ...
>> found out that    hint.mpt.0.msi_enable="1"
>> solves the interrupt storm problem, although dmesg output still is
>> exactly the same:
>>     mpt0: <LSILogic 1030 Ultra4 Adapter> port 0x4000-0x40ff mem
>> 0xd6440000-0xd645ffff,0xd6420000-0xd643ffff irq 18 at device 0.0 on pci3
>>     mpt0: MPI Version=1.2.15.0
>> Btw, I'm still curious what the sysctl "hw.mpt.0.role" means? With my
>> LSI1030 it's "3", an onther 1068, it's "1"
> Any hint for me what "hw.mpt.0.role" means?
>
>
>> ...I had no luck using "camcontrol negotiate sa0 -R 40" to
>> alter the negotiation parameters.
>> It always shows 3,300MB/s and seems to reflect reality
> I'd still need help here if possible.
> Is there any point to start for non-developers? Any SCSI command
> "secrets" I can try?
> If anybody is interested in solving, but lacks hardware, I'd donate one
> LSI20320IE.
>

Found dev.mpt.0.debug, set to 8:

Dec  5 21:05:36 wega kernel: mpt0: exit mpt_intr
Dec  5 21:05:36 wega kernel: mpt0: enter mpt_intr
. (some hundred times repeated)

kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: TMF complete: req 0xffffff8030ace480:304 status 0x0
kernel: mpt0: exit mpt_intr
kernel: SCSI IO Request @ 0xffffff823ffa7b00
kernel: Chain Offset  0x00
kernel: MsgFlags      0x00
kernel: MsgContext    0x0001012a
kernel: Bus:                0
kernel: TargetID            0
kernel: SenseBufferLength   32
kernel: LUN:              0x0
kernel: Control           0x00000500  NODATATRANSFER  UNTAGGED
kernel: DataLength 0x00000000
kernel: SenseBufAddr       0x911255e0
kernel: CDB[0:6]   00 00 00 00 00 00
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: Address Reply:
kernel: SCSI IO Request Reply @ 0xffffff823fff9a00
kernel: IOC Status    Success
kernel: IOCLogInfo    0x00000000
kernel: MsgLength     0x08
kernel: MsgFlags      0x00
kernel: MsgContext    0x0001012a
kernel: Bus:          0
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: TMF complete: req 0xffffff8030ace480:304 status 0x0
kernel: mpt0: exit mpt_intr
kernel: SCSI IO Request @ 0xffffff823ffa7b00
kernel: Chain Offset  0x00
kernel: MsgFlags      0x00
kernel: MsgContext    0x0001012a
kernel: Bus:                0
kernel: TargetID            0
kernel: SenseBufferLength   32
kernel: LUN:              0x0
kernel: Control           0x00000500  NODATATRANSFER  UNTAGGED
kernel: DataLength 0x00000000
kernel: SenseBufAddr       0x911255e0
kernel: CDB[0:6]   00 00 00 00 00 00
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: SCSI IO Request Reply @ 0xffffff823fff9a00
kernel: IOC Status    Success
kernel: IOCLogInfo    0x00000000
kernel: MsgLength     0x08
kernel: MsgFlags      0x00
kernel: MsgContext    0x0001012a
kernel: Bus:          0
kernel: TargetID      0
kernel: CDBLength     6
kernel: SCSI Status:  Check Condition
kernel: SCSI State:   (0x00000001)AutoSense_Valid
kernel: TransferCnt   0x0000
kernel: SenseCnt      0x0012
kernel: ResponseInfo  0x00000000
kernel: mpt0: exit mpt_intr
kernel: SCSI IO Request @ 0xffffff80002ae3d0
kernel: Chain Offset  0x00
kernel: MsgFlags      0x00
kernel: MsgContext    0x0001012b
kernel: Bus:                0
kernel: TargetID            0
kernel: SenseBufferLength   18
kernel: LUN:              0x0
kernel: Control           0x02000500  READ  UNTAGGED
kernel: DataLength 0x00000024
kernel: SenseBufAddr       0x911257e0
kernel: CDB[0:6]   12 00 00 00 24 00
kernel: 64_BIT_ADDRESSING LAST_ELEMENT END_OF_BUFFER END_OF_LIST
kernel: mpt0: enter mpt_intr
kernel: mpt0: Context Reply: 0x0001012b
kernel: mpt0: exit mpt_intr
kernel: SCSI IO Request @ 0xffffff80002ae3d0
kernel: Chain Offset  0x00
kernel: MsgFlags      0x00
kernel: MsgContext    0x0001012c
kernel: Bus:                0
kernel: TargetID            0
kernel: SenseBufferLength   18
kernel: LUN:              0x0
kernel: Control           0x02000500  READ  UNTAGGED
kernel: DataLength 0x00000038
kernel: SenseBufAddr       0x911259e0
kernel: CDB[0:6]   12 00 00 00 38 00
kernel: SE64 0xffffff8240020830: Addr=0x0000000057ce18f8
FlagsLength=0xd3000038
kernel: 64_BIT_ADDRESSING LAST_ELEMENT END_OF_BUFFER END_OF_LIST
kernel: mpt0: enter mpt_intr
kernel: mpt0: Context Reply: 0x0001012c
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: mpt_get_spi_settings[0]: current NP 0 Info 9
kernel: mpt0: mpt_get_spi_settings[0]: ACTIVE flags 0x29 per 0x0 off=0
kernel: SCSI IO Request @ 0xffffff80002ae3d0
kernel: Chain Offset  0x00
kernel: MsgContext    0x0001012e
kernel: Bus:                0
kernel: TargetID            0
kernel: SenseBufferLength   18
kernel: LUN:              0x0
kernel: Control           0x02000500  READ  UNTAGGED
kernel: DataLength 0x000000ff
kernel: SenseBufAddr       0x91125de0
kernel: CDB[0:6]   12 01 00 00 ff 00
kernel: SE64 0xffffff8240020c30: Addr=0x0000000007c80900
FlagsLength=0xd30000ff
kernel: 64_BIT_ADDRESSING LAST_ELEMENT END_OF_BUFFER END_OF_LIST
kernel: mpt0: enter mpt_intr
kernel: mpt0: Address Reply:
kernel: SCSI IO Request Reply @ 0xffffff823fff9c00
kernel: IOC Status    SCSI: Data Underrun
kernel: IOCLogInfo    0x00000000
kernel: MsgLength     0x08
kernel: MsgFlags      0x00
kernel: MsgContext    0x0001012e
kernel: Bus:          0
kernel: TargetID      0
kernel: CDBLength     6
kernel: SCSI Status:  OK
kernel: SCSI State:   (0x00000000)
kernel: TransferCnt   0x000a
kernel: SenseCnt      0x0000
kernel: ResponseInfo  0x00000000
kernel: SCSI IO Request @ 0xffffff80002ae3d0
kernel: Chain Offset  0x00
kernel: MsgFlags      0x00
kernel: MsgContext    0x0001012f
kernel: Bus:                0
kernel: TargetID            0
kernel: SenseBufferLength   18
kernel: LUN:              0x0
kernel: Control           0x02000500  READ  UNTAGGED
kernel: DataLength 0x000000ff
kernel: SenseBufAddr       0x91125fe0
kernel: CDB[0:6]   12 01 80 00 ff 00
kernel: SE64 0xffffff8240020e30: Addr=0x00000001c8008800
FlagsLength=0xd30000ff
kernel: 64_BIT_ADDRESSING LAST_ELEMENT END_OF_BUFFER END_OF_LIST
kernel: mpt0: enter mpt_intr
kernel: mpt0: Address Reply:
kernel: SCSI IO Request Reply @ 0xffffff823fff9d00
kernel: IOC Status    SCSI: Data Underrun
kernel: IOCLogInfo    0x00000000
kernel: MsgLength     0x08
kernel: MsgFlags      0x00
kernel: MsgContext    0x0001012f
kernel: Bus:          0
kernel: TargetID      0
kernel: CDBLength     6
kernel: SCSI Status:  OK
kernel: SCSI State:   (0x00000000)
kernel: SenseCnt      0x0000
kernel: ResponseInfo  0x00000000
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: mpt_get_spi_settings[0]: current NP 0 Info 9
kernel: mpt0: mpt_get_spi_settings[0]: ACTIVE flags 0x29 per 0x0 off=0
kernel: SCSI IO Request @ 0xffffff80002ae090
kernel: Chain Offset  0x00
kernel: MsgFlags      0x00
kernel: MsgContext    0x00010131
kernel: Bus:                0
kernel: TargetID            0
kernel: SenseBufferLength   18
kernel: LUN:              0x1
kernel: Control           0x02000500  READ  UNTAGGED
kernel: DataLength 0x00000024
kernel: SenseBufAddr       0x911263e0
kernel: CDB[0:6]   12 00 00 00 24 00
kernel: SE64 0xffffff8240021230: Addr=0x00000001f98678f8
FlagsLength=0xd3000024
kernel: 64_BIT_ADDRESSING LAST_ELEMENT END_OF_BUFFER END_OF_LIST
kernel: mpt0: enter mpt_intr
kernel: mpt0: Context Reply: 0x00010131
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: mpt_get_spi_settings[0]: current NP 0 Info 9
kernel: SCSI IO Request @ 0xffffff80002ae090
kernel: Chain Offset  0x00
kernel: MsgFlags      0x00
kernel: MsgContext    0x00010133
kernel: Bus:                0
kernel: TargetID            0
kernel: SenseBufferLength   18
kernel: LUN:              0x2
kernel: Control           0x02000500  READ  UNTAGGED
kernel: DataLength 0x00000024
kernel: SenseBufAddr       0x911267e0
kernel: CDB[0:6]   12 00 00 00 24 00
kernel: SE64 0xffffff8240021630: Addr=0x00000001f986a0f8
FlagsLength=0xd3000024
kernel: 64_BIT_ADDRESSING LAST_ELEMENT END_OF_BUFFER END_OF_LIST
kernel: mpt0: enter mpt_intr
kernel: mpt0: Context Reply: 0x00010133
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: mpt_get_spi_settings[0]: current NP 0 Info 9
kernel: mpt0: mpt_get_spi_settings[0]: ACTIVE flags 0x29 per 0x0 off=0
kernel: SCSI IO Request @ 0xffffff80002ae090
kernel: Chain Offset  0x00
kernel: MsgFlags      0x00
kernel: MsgContext    0x00010135
kernel: Bus:                0
kernel: TargetID            0
kernel: LUN:              0x3
kernel: Control           0x02000500  READ  UNTAGGED
kernel: DataLength 0x00000024
kernel: SenseBufAddr       0x91126be0
kernel: CDB[0:6]   12 00 00 00 24 00
kernel: SE64 0xffffff8240021a30: Addr=0x0000000057cb58f8
FlagsLength=0xd3000024
kernel: 64_BIT_ADDRESSING LAST_ELEMENT END_OF_BUFFER END_OF_LIST
kernel: mpt0: enter mpt_intr
kernel: mpt0: Context Reply: 0x00010135
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: mpt_get_spi_settings[0]: current NP 0 Info 9
kernel: mpt0: mpt_get_spi_settings[0]: ACTIVE flags 0x29 per 0x0 off=0
kernel: SCSI IO Request @ 0xffffff80002ae090
kernel: Chain Offset  0x00
kernel: MsgFlags      0x00
kernel: MsgContext    0x00010137
kernel: Bus:                0
kernel: TargetID            0
kernel: SenseBufferLength   18
kernel: LUN:              0x4
kernel: Control           0x02000500  READ  UNTAGGED
kernel: DataLength 0x00000024
kernel: SenseBufAddr       0x91126fe0
kernel: CDB[0:6]   12 00 00 00 24 00
kernel: SE64 0xffffff8240021e30: Addr=0x00000000071438f8
FlagsLength=0xd3000024
kernel: mpt0: enter mpt_intr
kernel: mpt0: Context Reply: 0x00010137
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: mpt_get_spi_settings[0]: current NP 0 Info 9
kernel: mpt0: mpt_get_spi_settings[0]: ACTIVE flags 0x29 per 0x0 off=0
kernel: SCSI IO Request @ 0xffffff80002ae090
kernel: Chain Offset  0x00
kernel: MsgFlags      0x00
kernel: MsgContext    0x00010139
kernel: Bus:                0
kernel: TargetID            0
kernel: SenseBufferLength   18
kernel: LUN:              0x5
kernel: Control           0x02000500  READ  UNTAGGED
kernel: DataLength 0x00000024
kernel: SenseBufAddr       0x911273e0
kernel: CDB[0:6]   12 00 00 00 24 00
kernel: SE64 0xffffff8240022230: Addr=0x00000001f98180f8
FlagsLength=0xd3000024
kernel: 64_BIT_ADDRESSING LAST_ELEMENT END_OF_BUFFER END_OF_LIST
kernel: mpt0: enter mpt_intr
kernel: mpt0: Context Reply: 0x00010139
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: mpt_get_spi_settings[0]: current NP 0 Info 9
kernel: mpt0: mpt_get_spi_settings[0]: ACTIVE flags 0x29 per 0x0 off=0
kernel: SCSI IO Request @ 0xffffff80002ae090
kernel: Chain Offset  0x00
kernel: MsgFlags      0x00
kernel: MsgContext    0x0001013b
kernel: Bus:                0
kernel: TargetID            0
kernel: SenseBufferLength   18
kernel: LUN:              0x6
kernel: Control           0x02000500  READ  UNTAGGED
kernel: DataLength 0x00000024
kernel: SenseBufAddr       0x911277e0
kernel: CDB[0:6]   12 00 00 00 24 00
kernel: SE64 0xffffff8240022630: Addr=0x00000001f980e0f8
FlagsLength=0xd3000024
kernel: 64_BIT_ADDRESSING LAST_ELEMENT END_OF_BUFFER END_OF_LIST
kernel: mpt0: enter mpt_intr
kernel: mpt0: Context Reply: 0x0001013b
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: mpt_get_spi_settings[0]: current NP 0 Info 9
kernel: mpt0: mpt_get_spi_settings[0]: ACTIVE flags 0x29 per 0x0 off=0
kernel: SCSI IO Request @ 0xffffff80002ae090
kernel: Chain Offset  0x00
kernel: MsgFlags      0x00
kernel: MsgContext    0x0001013d
kernel: Bus:                0
kernel: TargetID            0
kernel: SenseBufferLength   18
kernel: LUN:              0x7
kernel: Control           0x02000500  READ  UNTAGGED
kernel: DataLength 0x00000024
kernel: SenseBufAddr       0x91127be0
kernel: CDB[0:6]   12 00 00 00 24 00
kernel: SE64 0xffffff8240022a30: Addr=0x00000000070fd0f8
FlagsLength=0xd3000024
kernel: 64_BIT_ADDRESSING LAST_ELEMENT END_OF_BUFFER END_OF_LIST
kernel: mpt0: enter mpt_intr
kernel: mpt0: Context Reply: 0x0001013d
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: mpt_get_spi_settings[1]: current NP 0 Info 0
kernel: mpt0: mpt_get_spi_settings[1]: ACTIVE flags 0x29 per 0x0 off=0
kernel: SCSI IO Request @ 0xffffff80002ae090
kernel: Chain Offset  0x00
kernel: MsgFlags      0x00
kernel: MsgContext    0x0001013f
kernel: Bus:                0
kernel: TargetID            1
kernel: SenseBufferLength   18
kernel: LUN:              0x0
kernel: Control           0x02000500  READ  UNTAGGED
kernel: DataLength 0x00000024
kernel: SenseBufAddr       0x91127fe0
kernel: CDB[0:6]   12 00 00 00 24 00
kernel: SE64 0xffffff8240022e30: Addr=0x00000001f980e0f8
FlagsLength=0xd3000024
kernel: 64_BIT_ADDRESSING LAST_ELEMENT END_OF_BUFFER END_OF_LIST
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: Address Reply:
kernel: SCSI IO Request Reply @ 0xffffff823fff9700
kernel: IOC Status    SCSI: Device Not There
kernel: IOCLogInfo    0x00000000
kernel: MsgLength     0x08
kernel: MsgFlags      0x00
kernel: MsgContext    0x0001013f
kernel: Bus:          0
kernel: TargetID      1
kernel: CDBLength     6
kernel: SCSI IO Request @ 0xffffff80002ae090
kernel: Chain Offset  0x00
kernel: MsgFlags      0x00
kernel: MsgContext    0x00010141
kernel: Bus:                0
kernel: TargetID            2
kernel: SenseBufferLength   18
kernel: LUN:              0x0
kernel: Control           0x02000500  READ  UNTAGGED
kernel: DataLength 0x00000024
kernel: SenseBufAddr       0x911283e0
kernel: CDB[0:6]   12 00 00 00 24 00
kernel: SE64 0xffffff8240023230: Addr=0x0000000057c1b0f8
FlagsLength=0xd3000024
kernel: 64_BIT_ADDRESSING LAST_ELEMENT END_OF_BUFFER END_OF_LIST
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: Address Reply:
kernel: SCSI IO Request Reply @ 0xffffff823fff9900
kernel: IOC Status    SCSI: Device Not There
kernel: IOCLogInfo    0x00000000
kernel: MsgLength     0x08
kernel: MsgFlags      0x00
kernel: MsgContext    0x00010141
kernel: Bus:          0
kernel: TargetID      2
kernel: CDBLength     6
kernel: SCSI Status:  OK
kernel: SCSI State:   (0x00000000)
kernel: TransferCnt   0x0000
kernel: SenseCnt      0x0000
kernel: ResponseInfo  0x00000000
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: SenseBufAddr       0x911277e0
kernel: CDB[0:6]   12 00 00 00 24 00
kernel: SE64 0xffffff8240022630: Addr=0x00000001f980e0f8
FlagsLength=0xd3000024
kernel: 64_BIT_ADDRESSING LAST_ELEMENT END_OF_BUFFER END_OF_LIST
kernel: mpt0: enter mpt_intr
kernel: mpt0: Context Reply: 0x0001013b
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: mpt_get_spi_settings[0]: current NP 0 Info 9
kernel: mpt0: mpt_get_spi_settings[0]: ACTIVE flags 0x29 per 0x0 off=0
kernel: SCSI IO Request @ 0xffffff80002ae090
kernel: Chain Offset  0x00
kernel: MsgContext    0x0001013d
kernel: Bus:                0
kernel: TargetID            0
kernel: SenseBufferLength   18
kernel: LUN:              0x7
kernel: Control           0x02000500  READ  UNTAGGED
kernel: DataLength 0x00000024
kernel: SenseBufAddr       0x91127be0
kernel: CDB[0:6]   12 00 00 00 24 00
kernel: SE64 0xffffff8240022a30: Addr=0x00000000070fd0f8
FlagsLength=0xd3000024
kernel: 64_BIT_ADDRESSING LAST_ELEMENT END_OF_BUFFER END_OF_LIST
kernel: mpt0: enter mpt_intr
kernel: Control           0x02000500  READ  UNTAGGED
kernel: DataLength 0x00000024
kernel: SenseBufAddr       0x911273e0
kernel: CDB[0:6]   12 00 00 00 24 00
kernel: SE64 0xffffff8240022230: Addr=0x00000001f98180f8
FlagsLength=0xd3000024
kernel: 64_BIT_ADDRESSING LAST_ELEMENT END_OF_BUFFER END_OF_LIST
kernel: mpt0: enter mpt_intr
kernel: mpt0: Context Reply: 0x00010139
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: mpt_get_spi_settings[0]: current NP 0 Info 9
kernel: mpt0: mpt_get_spi_settings[0]: ACTIVE flags 0x29 per 0x0 off=0
kernel: SCSI IO Request @ 0xffffff80002ae090
kernel: Chain Offset  0x00
kernel: MsgFlags      0x00
kernel: MsgContext    0x0001013b
kernel: TargetID            0
kernel: SenseBufferLength   18
kernel: LUN:              0x6
kernel: Control           0x02000500  READ  UNTAGGED
kernel: DataLength 0x00000024
kernel: SenseBufAddr       0x911277e0
kernel: CDB[0:6]   12 00 00 00 24 00
kernel: SE64 0xffffff8240022630: Addr=0x00000001f980e0f8
FlagsLength=0xd3000024
kernel: 64_BIT_ADDRESSING LAST_ELEMENT END_OF_BUFFER END_OF_LIST
kernel: mpt0: enter mpt_intr
kernel: mpt0: Context Reply: 0x0001013b
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: mpt_get_spi_settings[0]: current NP 0 Info 9
kernel: mpt0: mpt_get_spi_settings[0]: ACTIVE flags 0x29 per 0x0 off=0
kernel: SCSI IO Request @ 0xffffff80002ae090
kernel: Chain Offset  0x00
kernel: MsgFlags      0x00
kernel: MsgContext    0x0001013d
kernel: Bus:                0
kernel: TargetID            0
kernel: SenseBufferLength   18
kernel: LUN:              0x7
kernel: Control           0x02000500  READ  UNTAGGED
kernel: DataLength 0x00000024
kernel: SenseBufAddr       0x91127be0
kernel: SE64 0xffffff8240022a30: Addr=0x00000000070fd0f8
FlagsLength=0xd3000024
kernel: 64_BIT_ADDRESSING LAST_ELEMENT END_OF_BUFFER END_OF_LIST
kernel: mpt0: enter mpt_intr
kernel: mpt0: Context Reply: 0x0001013d
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: mpt_get_spi_settings[1]: current NP 0 Info 0
kernel: mpt0: mpt_get_spi_settings[1]: ACTIVE flags 0x29 per 0x0 off=0
kernel: SCSI IO Request @ 0xffffff80002ae090
kernel: Chain Offset  0x00
kernel: MsgFlags      0x00
kernel: MsgContext    0x0001013f
kernel: Bus:                0
kernel: TargetID            1
kernel: SenseBufferLength   18
kernel: LUN:              0x0
kernel: Control           0x02000500  READ  UNTAGGED
kernel: DataLength 0x00000024
kernel: SenseBufAddr       0x91127fe0
kernel: CDB[0:6]   12 00 00 00 24 00
kernel: SE64 0xffffff8240022e30: Addr=0x00000001f980e0f8
FlagsLength=0xd3000024
kernel: 64_BIT_ADDRESSING LAST_ELEMENT END_OF_BUFFER END_OF_LIST
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: exit mpt_intr
kernel: mpt0: enter mpt_intr
kernel: mpt0: Address Reply:
kernel: SCSI IO Request Reply @ 0xffffff823fff9700
kernel: IOC Status    SCSI: Device Not There

I can't read anything useful in there, but maybe someone else can?

This PR is about the same symptom, stating that the regression has been
between 6.2 and 6.3:
http://www.freebsd.org/cgi/query-pr.cgi?pr=120247

Back in 2006-May, Scott Long and Matthew Jacob responded to a similar
mpt issue:
http://lists.freebsd.org/pipermail/freebsd-current/2006-May/063619.html

Does anybody know if that hs ever been fixed?

Thanks,

-Harry

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