Hi,
two problems with ICH10R in AHCI.
First the minor(?) issue, the ICH10(R) datasheet
http://www.intel.com/Assets/PDF/datasheet/319973.pdf
says on page 527, PMS flag: port multipliers are not supported. The PMFSE
flag page 542 says neither port multipliers nor FIS pmp are supported.
On our ASUS P5Q Pro motherboard with ICH10R, ahci detects 'pmp':
ahci 0000:00:1f.2: AHCI 0001.0200 32 slots 6 ports 3 Gbps 0x3f impl SATA mode
ahci 0000:00:1f.2: flags: 64bit ncq sntf stag pm led clo pmp pio slum part ems
In light of the datasheet, perhaps in ahci.c the CAP register (read-only
from host) 'pmp' flag should be actively reset to 0 for ich10r?
Ayway the bigger issue with ICH10R is that the SATA disks detach randomly
during "heavy" i/o load. This happens withing just a few seconds. If I
disable NCQ (echo 1 > nr_requests), it takes "longer" to happen, some ten
seconds. I already ruled out the SATA cables, disks themselves, and disk
cages as a cause.
The detaching happens at least in these (Ubuntu-patched) kernels:
$ uname -rm
2.6.27-2-generic i686
$ uname -rm
2.6.24-19-generic i686
It happens with disks behind a port multiplier. The ich10r 'pmp'
"support" seems to work as CB- but not FIS-based, so it is slow, or just
broken.
But the detaches also happen with disks connected to the native ich10r
ports.
All in all ich10r seems to work very unreliably. So I was wondering if
support for ICH10R in ahci.c is not complete yet?
Or can someone here shout "ich10r ahci works for me"?
The following happened with two disks behind a port multiplier and
writing to one disk:
[10648.936095] sd 0:0:0:0: [sdb] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
[10648.936104] sd 0:0:0:0: [sdb] Sense Key : Aborted Command [current] [descriptor]
[10648.936112] Descriptor sense data with sense descriptors (in hex):
[10648.936117] 72 0b 00 00 00 00 00 0c 00 0a 80 00 00 00 00 00
[10648.936127] 00 00 00 00
[10648.936131] sd 0:0:0:0: [sdb] Add. Sense: No additional sense information
[10648.936152] ata1: EH complete
[10648.936200] sd 0:1:0:0: [sdc] 1953525168 512-byte hardware sectors (1000205 MB)
[10648.936221] sd 0:1:0:0: [sdc] Write Protect is off
[10648.936270] sd 0:1:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[10648.936278] ata1.00: detaching (SCSI 0:0:0:0)
[10648.936289] Dev sdb: unable to read RDB block 0
[10648.936322] unable to read partition table
[10648.938056] sd 0:0:0:0: [sdb] Synchronizing SCSI cache
[10648.938099] sd 0:0:0:0: [sdb] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK
[10648.938103] sd 0:0:0:0: [sdb] Stopping disk
[10648.938114] sd 0:0:0:0: [sdb] START_STOP FAILED
And this happened with the port multiplier removed and different disks
connected to only the native ich10r ports with no multiplier:
[470.408042] sd 1:0:0:0: [sdb] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
[470.408047] sd 1:0:0:0: [sdb] Sense Key : Aborted Command [current] [descriptor]
[470.408055] Descriptor sense data with sense descriptors (in hex):
[470.408057] 72 0b 00 00 00 00 00 0c 00 0a 80 00 00 00 00 00
[470.408068] 00 01 34 00
[470.408072] sd 1:0:0:0: [sdb] Add. Sense: No additional sense information
[470.408208] lost page write due to I/O error on md0
[470.408268] lost page write due to I/O error on md0
[470.408326] lost page write due to I/O error on md0
...
[470.408836] sd 1:0:0:0: [sdb] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
[470.408839] sd 1:0:0:0: [sdb] Sense Key : Aborted Command [current] [descriptor]
[470.408845] Descriptor sense data with sense descriptors (in hex):
[470.408847] 72 0b 00 00 00 00 00 0c 00 0a 80 00 00 00 00 00
[470.408858] 00 01 34 00
[470.408861] sd 1:0:0:0: [sdb] Add. Sense: No additional sense information
[470.409021] sd 1:0:0:0: [sdb] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
[470.409025] sd 1:0:0:0: [sdb] Sense Key : Aborted Command [current] [descriptor]
[470.409030] Descriptor sense data with sense descriptors (in hex):
[470.409032] 72 0b 00 00 00 00 00 0c 00 0a 80 00 00 00 00 00
[470.409042] 00 01 34 00
[470.409046] sd 1:0:0:0: [sdb] Add. Sense: No additional sense information
For me kind of hard to debug. If you need more info please just say!
Many thanks,
- Jan
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