I try to simulate random reads with "sysbench --test=fileio
--num-threads=16 --max-requests=9999999 --max-time=60 --init-rng=on
--file-num=16 --file-fsync-freq=0 --file-test-mode=rndrd
--file-total-size=30G run"
Two marvell controllers, 16 disks, software raid10, IO stucks on
different disks, kernel 2.6.26.5.
With default ubuntu's 8.04 2.6.24 kernel the problem can not be repeated
[ 289.851609] ata11.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action
0x6 frozen
[ 289.851695] ata11.00: cmd 61/08:00:60:1e:bf/00:00:01:00:00/40 tag 0
ncq 4096 out
[ 289.851697] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask
0x4 (timeout)
[ 289.851774] ata11.00: status: { DRDY }
[ 289.851834] ata11: hard resetting link
[ 290.649259] ata11: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 290.749239] ata11.00: max_sectors limited to 256 for NCQ
[ 290.809189] ata11.00: max_sectors limited to 256 for NCQ
[ 290.809194] ata11.00: configured for UDMA/133
[ 290.809200] ata11: EH complete
[ 290.809242] sd 10:0:0:0: [sdk] 1953525168 512-byte hardware sectors
(1000205 MB)
[ 290.809258] sd 10:0:0:0: [sdk] Write Protect is off
[ 290.809263] sd 10:0:0:0: [sdk] Mode Sense: 00 3a 00 00
[ 290.809286] sd 10:0:0:0: [sdk] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
lspci:
05:01.0 SCSI storage controller: Marvell Technology Group Ltd.
MV88SX6081 8-port SATA II PCI-X Controller (rev 09)
Subsystem: Marvell Technology Group Ltd. Unknown device 11ab
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop-
ParErr+ Stepping- SERR+ FastB2B+
Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 32, Cache Line Size: 32 bytes
Interrupt: pin A routed to IRQ 24
Region 0: Memory at d8200000 (64-bit, non-prefetchable) [size=1M]
Region 2: I/O ports at 3000 [size=256]
Capabilities: [40] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [50] Message Signalled Interrupts: Mask- 64bit+
Queue=0/0 Enable-
Address: 0000000000000000 Data: 0000
Capabilities: [60] PCI-X non-bridge device
Command: DPERE- ERO- RBC=512 OST=4
Status: Dev=05:01.0 64bit+ 133MHz+ SCD- USC- DC=simple
DMMRBC=512 DMOST=4 DMCRS=8 RSCEM- 266MHz- 533MHz-
05:02.0 SCSI storage controller: Marvell Technology Group Ltd.
MV88SX6081 8-port SATA II PCI-X Controller (rev 09)
Subsystem: Marvell Technology Group Ltd. Unknown device 11ab
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop-
ParErr+ Stepping- SERR+ FastB2B+
Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 32, Cache Line Size: 32 bytes
Interrupt: pin A routed to IRQ 28
Region 0: Memory at d8300000 (64-bit, non-prefetchable) [size=1M]
Region 2: I/O ports at 3400 [size=256]
Region 3: [virtual] Memory at d8800000 (32-bit,
non-prefetchable) [size=4M]
[virtual] Expansion ROM at d9000000 [disabled] [size=4M]
Capabilities: [40] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [50] Message Signalled Interrupts: Mask- 64bit+
Queue=0/0 Enable-
Address: 0000000000000000 Data: 0000
Capabilities: [60] PCI-X non-bridge device
Command: DPERE- ERO- RBC=512 OST=4
Status: Dev=05:02.0 64bit+ 133MHz+ SCD- USC- DC=simple
DMMRBC=512 DMOST=4 DMCRS=8 RSCEM- 266MHz- 533MHz-
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