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Tiberizzle
n00b
n00b


Joined: 20 Nov 2006
Posts: 8

PostPosted: Thu Dec 28, 2006 6:59 pm    Post subject: Dreadful E4500 U160 SCSI peformance on PCI I/O board Reply with quote

Linux supernova 2.6.17-gentoo-r8 #1 SMP Sat Dec 9 16:38:02 EST 2006 sparc64 sun4u TI UltraSparc II (BlackBird) GNU/Linux

Right now I'm using 4 disks on a single channel of an NetFinity EXP300 / Adaptec 39160 in Linux software RAID-5. I had planned to fill up the EXP300 and use both channels of the enclosure and RAID controller but I'm already running into bottlenecks with just the 4 drives I have caddies for now.

Single disk performs as expected:
Code:
supernova ~ # hdparm -t /dev/sdc

/dev/sdc:
 Timing O_DIRECT disk reads:  104 MB in  3.03 seconds =  34.36 MB/sec


MD array however performs very poorly:
Code:
supernova ~ # hdparm -t /dev/md0

/dev/md0:
 Timing O_DIRECT disk reads:  178 MB in  3.01 seconds =  59.11 MB/sec


Should be more like 120MB/sec, no?

The following seems to indicate that absolutely no IRQ load-balancing is occuring and the system does not seem to change behavior with
different values of /proc/irq/*/smp_affinity. "top" also reports only a single CPU logging time in system interrupt state and system state when
the RAID volume is being tested.

Code:
supernova ~ # cat /proc/interrupts
  0:    1868200          0          0          0          0          0          0          0          0          0          0          0  timer:dead
  5:      16950      21199      11227         15       3366          0          0          0          0          0          0          0  qla1280:e0, qla1280:84, eth0:a1, aic7xxx:c4, aic7xxx:c5
 12:       3881          0          0          0          0          0          0          0          0          0          0          0  SunZilog:b9
 15:          0          0          0          0          0          0          0          0          0          0          0          0  PSYCHO UE:ee, PSYCHO CE:ef, PSYCHO PCIERR:f0, PSYCHO PCIERR:f1, PSYCHO UE:ae, PSYCHO CE:af, PSYCHO PCIERR:b0, PSYCHO PCIERR:b1


Configuration details below:

Code:
supernova ~ # cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid5] [raid4] [raid6] [multipath]
md0 : active raid5 dm-3[3] dm-2[2] dm-1[1] dm-0[0]
      106642944 blocks level 5, 512k chunk, algorithm 0 [4/4] [UUUU]

unused devices: <none>


Code:
supernova ~ # lspci -v
80:00.0 Host bridge: Sun Microsystems Computer Corp. Psycho PCI Bus Module
        Flags: bus master, 66MHz, medium devsel, latency 64

80:02.0 PCI bridge: Digital Equipment Corporation DECchip 21152 (rev 03) (prog-if 00 [Normal decode])
        Flags: bus master, medium devsel, latency 0
        Bus: primary=80, secondary=81, subordinate=81, sec-latency=0
        I/O behind bridge: 00001000-00001fff
        Memory behind bridge: 00100000-028fffff
        Capabilities: [dc] Power Management version 1

81:00.0 Bridge: Sun Microsystems Computer Corp. EBUS (rev 01)
        Flags: bus master, medium devsel, latency 80
        Memory at 1c501000000 (32-bit, non-prefetchable) [size=16M]
        Memory at 1c502000000 (32-bit, non-prefetchable) [size=8M]
        Expansion ROM at 1c503000000 [disabled] [size=16M]

81:00.1 Ethernet controller: Sun Microsystems Computer Corp. Happy Meal (rev 01)
        Flags: bus master, medium devsel, latency 80, IRQ 0082be20
        Memory at 1c502800000 (32-bit, non-prefetchable) [size=32K]
        Expansion ROM at 1c504000000 [disabled] [size=16M]

81:04.0 SCSI storage controller: QLogic Corp. ISP1020 Fast-wide SCSI (rev 05)
        Flags: bus master, medium devsel, latency 32, IRQ 0082be00
        I/O ports at 1c402001000 [size=256]
        Memory at 1c502808000 (32-bit, non-prefetchable) [size=4K]
        Expansion ROM at 1c502810000 [disabled] [size=64K]

0001:00:00.0 Host bridge: Sun Microsystems Computer Corp. Psycho PCI Bus Module
        Flags: bus master, medium devsel, latency 64

0001:00:01.0 Bridge: Sun Microsystems Computer Corp. EBUS (rev 01)
        Flags: bus master, medium devsel, latency 80
        Memory at 1c581000000 (32-bit, non-prefetchable) [size=16M]
        Memory at 1c582000000 (32-bit, non-prefetchable) [size=8M]
        Expansion ROM at 1c583000000 [disabled] [size=16M]

0001:00:01.1 Ethernet controller: Sun Microsystems Computer Corp. Happy Meal (rev 01)
        Flags: bus master, medium devsel, latency 255, IRQ 0082c1a0
        Memory at 1c582800000 (32-bit, non-prefetchable) [size=32K]
        Expansion ROM at 1c584000000 [disabled] [size=16M]

0002:80:00.0 Host bridge: Sun Microsystems Computer Corp. Psycho PCI Bus Module
        Flags: bus master, 66MHz, medium devsel, latency 64

0002:80:02.0 SCSI storage controller: Adaptec AHA-3960D / AIC-7899A U160/m (rev 01)
        Subsystem: Adaptec AHA-3960D U160/m
        Flags: bus master, 66MHz, medium devsel, latency 160, IRQ 0082c600
        BIST result: 00
        I/O ports at 1c602000400 [disabled] [size=256]
        Memory at 1c700002000 (64-bit, non-prefetchable) [size=4K]
        Expansion ROM at 1c700020000 [disabled] [size=128K]
        Capabilities: [dc] Power Management version 2

0002:80:02.1 SCSI storage controller: Adaptec AHA-3960D / AIC-7899A U160/m (rev 01)
        Subsystem: Adaptec AHA-3960D U160/m
        Flags: bus master, 66MHz, medium devsel, latency 160, IRQ 0082c620
        BIST result: 00
        I/O ports at 1c602000800 [disabled] [size=256]
        Memory at 1c700004000 (64-bit, non-prefetchable) [size=4K]
        Expansion ROM at 1c700040000 [disabled] [size=128K]
        Capabilities: [dc] Power Management version 2

0003:00:00.0 Host bridge: Sun Microsystems Computer Corp. Psycho PCI Bus Module
        Flags: bus master, medium devsel, latency 64

0003:00:03.0 SCSI storage controller: QLogic Corp. ISP1020 Fast-wide SCSI (rev 05)
        Flags: bus master, medium devsel, latency 32, IRQ 0082c980
        I/O ports at 1c602010400 [size=256]
        Memory at 1c780002000 (32-bit, non-prefetchable) [size=4K]
        Expansion ROM at 1c780010000 [disabled] [size=64K]


Code:
supernova ~ # dmesg
[    0.000000] PROMLIB: Sun IEEE Boot Prom 'OBP 3.2.28 2000/12/20 12:24'
[    0.000000] PROMLIB: Root node compatible:
[    0.000000] Linux version 2.6.17-gentoo-r8 (root@livecd) (gcc version 3.4.6 (Gentoo Linux 3.4.6)) #1 SMP Sat Dec 9 16:38:02 EST 2006
[    0.000000] ARCH: SUN4U
[    0.000000] Ethernet address: 08:00:20:ac:f9:c6
[    0.000000] On node 0 totalpages: 1571145
[    0.000000]   DMA zone: 1571145 pages, LIFO batch:15
[    0.000000] CENTRAL: Detected 8 slot Enterprise system. cfreg[68] cver[78]
[    0.000000] FHC(board 1): Version[1] PartID[fa0] Manuf[3e] (CENTRAL)
[    0.000000] FHC(board 0): Version[1] PartID[fa0] Manuf[3e] (JTAG Master)
[    0.000000] FHC(board 2): Version[1] PartID[fa0] Manuf[3e]
[    0.000000] FHC(board 3): Version[1] PartID[fa0] Manuf[3e]
[    0.000000] FHC(board 4): Version[1] PartID[fa0] Manuf[3e]
[    0.000000] FHC(board 6): Version[1] PartID[fa0] Manuf[3e]
[    0.000000] FHC(board 7): Version[1] PartID[fa0] Manuf[3e]
[    0.000000] FHC(board 1): Version[1] PartID[fa0] Manuf[3e]
[    0.000000] Built 1 zonelists
[    0.000000] Kernel command line: root=/dev/sda1
[    0.000000] PID hash table entries: 4096 (order: 12, 32768 bytes)
[    2.206438] Console: colour dummy device 80x25
[    2.269162] Dentry cache hash table entries: 2097152 (order: 11, 16777216 bytes)
[    2.379733] Inode-cache hash table entries: 1048576 (order: 10, 8388608 bytes)
[    2.961373] Memory: 12457168k available (2952k kernel code, 1064k data, 192k init) [fffff80000000000,00000002ffd04000]
[    3.040782] Calibrating delay using timer specific routine.. 800.44 BogoMIPS (lpj=1600882)
[    3.041212] Mount-cache hash table entries: 512
[    3.043512] CPU[0]: Caches D[sz(16384):line_sz(32)] I[sz(16384):line_sz(32)] E[sz(8388608):line_sz(64)]
[    3.067796] Using max_cache_size of 8MB
[    3.148784] Calibrating delay using timer specific routine.. 800.05 BogoMIPS (lpj=1600114)
[    3.150541] CPU[1]: Caches D[sz(16384):line_sz(32)] I[sz(16384):line_sz(32)] E[sz(8388608):line_sz(64)]
[    3.151251] CPU 1: synchronized TICK with master CPU (last diff -17 cycles,maxerr 701 cycles)
[    3.232783] Calibrating delay using timer specific routine.. 800.06 BogoMIPS (lpj=1600130)
[    3.234815] CPU[4]: Caches D[sz(16384):line_sz(32)] I[sz(16384):line_sz(32)] E[sz(8388608):line_sz(64)]
[    3.235496] CPU 4: synchronized TICK with master CPU (last diff -14 cycles,maxerr 709 cycles)
[    3.316784] Calibrating delay using timer specific routine.. 800.06 BogoMIPS (lpj=1600127)
[    3.319007] CPU[5]: Caches D[sz(16384):line_sz(32)] I[sz(16384):line_sz(32)] E[sz(8388608):line_sz(64)]
[    3.319686] CPU 5: synchronized TICK with master CPU (last diff -16 cycles,maxerr 702 cycles)
[    3.400783] Calibrating delay using timer specific routine.. 800.05 BogoMIPS (lpj=1600107)
[    3.403228] CPU[6]: Caches D[sz(16384):line_sz(32)] I[sz(16384):line_sz(32)] E[sz(8388608):line_sz(64)]
[    3.403941] CPU 6: synchronized TICK with master CPU (last diff -16 cycles,maxerr 710 cycles)
[    3.484784] Calibrating delay using timer specific routine.. 800.07 BogoMIPS (lpj=1600145)
[    3.487413] CPU[7]: Caches D[sz(16384):line_sz(32)] I[sz(16384):line_sz(32)] E[sz(8388608):line_sz(64)]
[    3.488074] CPU 7: synchronized TICK with master CPU (last diff -17 cycles,maxerr 708 cycles)
[    3.568783] Calibrating delay using timer specific routine.. 800.05 BogoMIPS (lpj=1600117)
[    3.571652] CPU[8]: Caches D[sz(16384):line_sz(32)] I[sz(16384):line_sz(32)] E[sz(8388608):line_sz(64)]
[    3.572350] CPU 8: synchronized TICK with master CPU (last diff -13 cycles,maxerr 701 cycles)
[    3.652784] Calibrating delay using timer specific routine.. 800.05 BogoMIPS (lpj=1600119)
[    3.655824] CPU[9]: Caches D[sz(16384):line_sz(32)] I[sz(16384):line_sz(32)] E[sz(8388608):line_sz(64)]
[    3.656483] CPU 9: synchronized TICK with master CPU (last diff -17 cycles,maxerr 709 cycles)
[    3.740784] Calibrating delay using timer specific routine.. 800.06 BogoMIPS (lpj=1600121)
[    3.744162] CPU[12]: Caches D[sz(16384):line_sz(32)] I[sz(16384):line_sz(32)] E[sz(8388608):line_sz(64)]
[    3.744819] CPU 12: synchronized TICK with master CPU (last diff -13 cycles,maxerr 707 cycles)
[    3.828784] Calibrating delay using timer specific routine.. 800.06 BogoMIPS (lpj=1600124)
[    3.832231] CPU[13]: Caches D[sz(16384):line_sz(32)] I[sz(16384):line_sz(32)] E[sz(8388608):line_sz(64)]
[    3.832881] CPU 13: synchronized TICK with master CPU (last diff -17 cycles,maxerr 704 cycles)
[    3.916783] Calibrating delay using timer specific routine.. 800.06 BogoMIPS (lpj=1600121)
[    3.920459] CPU[14]: Caches D[sz(16384):line_sz(32)] I[sz(16384):line_sz(32)] E[sz(8388608):line_sz(64)]
[    3.921191] CPU 14: synchronized TICK with master CPU (last diff -17 cycles,maxerr 710 cycles)
[    4.004784] Calibrating delay using timer specific routine.. 800.06 BogoMIPS (lpj=1600124)
[    4.008608] CPU[15]: Caches D[sz(16384):line_sz(32)] I[sz(16384):line_sz(32)] E[sz(8388608):line_sz(64)]
[    4.009344] CPU 15: synchronized TICK with master CPU (last diff -22 cycles,maxerr 714 cycles)
[    4.009366] Brought up 12 CPUs
[    4.009390] Total of 12 processors activated (9601.11 BogoMIPS).
[    9.755363] migration_cost=157965
[    9.758156] NET: Registered protocol family 16
[    9.783866] PCI: Probing for controllers.
[    9.787063] PCI: Found PSYCHO, control regs at 000001c400000000
[    9.787081] PSYCHO: Shared PCI config space at 000001c401000000
[    9.796764] PCI: Found PSYCHO, control regs at 000001c600000000
[    9.796795] PSYCHO: Shared PCI config space at 000001c601000000
[    9.807953] PCI1(PBMB): Bus running at 33MHz
[    9.810378] PCI1(PBMA): Bus running at 66MHz
[    9.812603] PCI0(PBMB): Bus running at 33MHz
[    9.816099] PSYCHO0 PBMA: 0000:81:00.1 IRQ Swivel 0000:81:00.1 [2:0] -> [2]
[    9.816276] PSYCHO0 PBMA: 0000:81:04.0 IRQ Swivel 0000:81:04.0 [1:4] -> [1]
[    9.816368] PCI0(PBMA): Bus running at 33MHz
[    9.816561] ebus: No EBus's found.
[    9.819770] SCSI subsystem initialized
[    9.828969] NET: Registered protocol family 2
[    9.865066] IP route cache hash table entries: 524288 (order: 9, 4194304 bytes)
[    9.884155] TCP established hash table entries: 524288 (order: 10, 8388608 bytes)
[    9.923758] TCP bind hash table entries: 65536 (order: 7, 1048576 bytes)
[    9.928736] TCP: Hash tables configured (established 524288 bind 65536)
[    9.928759] TCP reno registered
[    9.934179] Total HugeTLB memory allocated, 0
[    9.937331] Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
[    9.995740] Initializing Cryptographic API
[    9.995774] io scheduler noop registered
[    9.995841] io scheduler anticipatory registered (default)
[    9.995921] io scheduler deadline registered
[    9.996089] io scheduler cfq registered
[   10.009562] rtc_init: no PC rtc found
[   10.019644] SunZilog: 2 chips.
[   10.235878] zs2 at 0x000001fff8904004 (irq = 12,b9) is a SunZilog
[   10.338955] zs3 at 0x000001fff8904000 (irq = 12,b9) is a SunZilog
[   10.442076] ttyS0 at MMIO 0x0 (irq = 8570016) is a SunZilog
[   10.442324] Console: ttyS0 (SunZilog zs0)
[    0.659570] ttyS1 at MMIO 0x0 (irq = 8570016) is a SunZilog
[    0.724916] mice: PS/2 mouse device common for all mice
[    0.788266] RAMDISK driver initialized: 4 RAM disks of 4096K size 1024 blocksize
[    0.876928] loop: loaded (max 8 devices)
[    0.922807] nbd: registered device at major 43
[    0.979410] qla1280: QLA1040 found on PCI bus 0, dev 3
[    1.626685] scsi(0:0): Resetting SCSI BUS
[    1.787439] input: Sun Mouse as /class/input/input0
[    4.676951] scsi0 : QLogic QLA1040 PCI to SCSI Host Adapter
[    4.676962]        Firmware version:  7.65.06, Driver version 3.26
[    5.819752]   Vendor: TOSHIBA   Model: DVD-ROM SD-M1401  Rev: 1007
[    5.891612]   Type:   CD-ROM                             ANSI SCSI revision: 02
[    5.979822] scsi(0:0:6:0): Sync: period 10, offset 12
[    7.377912] qla1280: QLA1040 found on PCI bus 129, dev 4
[    8.112904] scsi(1:0): Resetting SCSI BUS
[   11.166902] scsi1 : QLogic QLA1040 PCI to SCSI Host Adapter
[   11.166912]        Firmware version:  7.65.06, Driver version 3.26
[   13.145838]   Vendor: IBM       Model: DDYST1835SUN18G   Rev: S96H
[   13.217672]   Type:   Direct-Access                      ANSI SCSI revision: 03
[   13.305875] scsi(1:0:12:0): Sync: period 10, offset 12, Wide
[   13.375822]   Vendor: IBM       Model: DDYST1835SUN18G   Rev: S96H
[   13.447721]   Type:   Direct-Access                      ANSI SCSI revision: 03
[   13.535907] scsi(1:0:13:0): Sync: period 10, offset 12, Wide
[   13.941490] SCSI device sda: 35378533 512-byte hdwr sectors (18114 MB)
[   14.018856] sda: Write Protect is off
[   14.061334] sda: Mode Sense: fb 00 00 08
[   14.062932] SCSI device sda: drive cache: write through
[   14.125195] SCSI device sda: 35378533 512-byte hdwr sectors (18114 MB)
[   14.203205] sda: Write Protect is off
[   14.245738] sda: Mode Sense: fb 00 00 08
[   14.247361] SCSI device sda: drive cache: write through
[   14.308279]  sda: sda1 sda2 sda3
[   14.360838] sd 1:0:12:0: Attached scsi disk sda
[   14.417066] SCSI device sdb: 35378533 512-byte hdwr sectors (18114 MB)
[   14.494462] sdb: Write Protect is off
[   14.536963] sdb: Mode Sense: fb 00 00 08
[   14.538546] SCSI device sdb: drive cache: write through
[   14.600772] SCSI device sdb: 35378533 512-byte hdwr sectors (18114 MB)
[   14.678887] sdb: Write Protect is off
[   14.721356] sdb: Mode Sense: fb 00 00 08
[   14.722980] SCSI device sdb: drive cache: write through
[   14.783885]  sdb: sdb1 sdb2 sdb3
[   14.834750] sd 1:0:13:0: Attached scsi disk sdb
[   14.889763] sr0: scsi3-mmc drive: 40x/40x cd/rw xa/form2 cdda tray
[   14.962315] Uniform CD-ROM driver Revision: 3.20
[   15.018026] sr 0:0:6:0: Attached scsi CD-ROM sr0
[   15.018339] sr 0:0:6:0: Attached scsi generic sg0 type 5
[   15.081286] sd 1:0:12:0: Attached scsi generic sg1 type 0
[   15.145937] sd 1:0:13:0: Attached scsi generic sg2 type 0
[   15.211126] rtc_sun_init: Registered Mostek RTC driver.
[   15.272791] md: linear personality registered for level -1
[   15.338419] md: raid0 personality registered for level 0
[   15.401976] md: raid1 personality registered for level 1
[   15.465522] md: raid10 personality registered for level 10
[   15.531159] md: raid5 personality registered for level 5
[   15.594711] md: raid4 personality registered for level 4
[   15.658312] raid5: automatically using best checksumming function: VIS
[   15.752952]    VIS       :   154.000 MB/sec
[   15.800983] raid5: using function: VIS (154.000 MB/sec)
[   15.929198] raid6: int64x1    206 MB/s
[   16.036988] raid6: int64x2    333 MB/s
[   16.144979] raid6: int64x4    411 MB/s
[   16.253209] raid6: int64x8    195 MB/s
[   16.295966] raid6: using algorithm int64x4 (411 MB/s)
[   16.356417] md: raid6 personality registered for level 6
[   16.419977] md: multipath personality registered for level -4
[   16.488738] md: md driver 0.90.3 MAX_MD_DEVS=256, MD_SB_DISKS=27
[   16.560630] md: bitmap version 4.39
[   16.602736] device-mapper: 4.6.0-ioctl (2006-02-17) initialised: dm-devel@redhat.com
[   16.697771] TCP bic registered
[   16.732243] NET: Registered protocol family 1
[   16.784331] NET: Registered protocol family 17
[   16.838764] md: Autodetecting RAID arrays.
[   16.886415] md: autorun ...
[   16.919731] md: ... autorun DONE.
[   16.971908] kjournald starting.  Commit interval 5 seconds
[   17.035758] EXT3-fs: mounted filesystem with ordered data mode.
[   17.106607] VFS: Mounted root (ext3 filesystem) readonly.
[    3.806482] EXT3 FS on sda1, internal journal
[    4.336859] sunhme.c:v2.02 8/24/03 David S. Miller (davem@redhat.com)
[    4.337951] eth0: HAPPY MEAL (PCI/CheerIO) 10/100BaseT Ethernet 08:00:20:ac:f9:c6
[    4.339177] eth1: HAPPY MEAL (PCI/CheerIO) 10/100BaseT Ethernet 08:00:20:ac:f9:c6
[    4.842275] Adding 999984k swap on /dev/sda2.  Priority:-1 extents:1 across:999984k
[    1.849114] eth0: Link is up using internal transceiver at 100Mb/s, Full Duplex.
[   13.627225] scsi2 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 7.0
[   13.627240]         <Adaptec 3960D Ultra160 SCSI adapter>
[   13.627250]         aic7899: Ultra160 Wide Channel A, SCSI Id=7, 32/253 SCBs
[   13.627262]
[    5.511845] scsi3 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 7.0
[    5.511861]         <Adaptec 3960D Ultra160 SCSI adapter>
[    5.511871]         aic7899: Ultra160 Wide Channel B, SCSI Id=7, 32/253 SCBs
[    5.511883]
[    8.083665]   Vendor: IBM-PSG   Model: ST336704LC    !#  Rev: B232
[    8.083816]   Type:   Direct-Access                      ANSI SCSI revision: 03
[    8.083881] scsi3:A:11:0: Tagged Queuing enabled.  Depth 32
[    8.083948]  target3:0:11: Beginning Domain Validation
[    8.089745]  target3:0:11: wide asynchronous
[    8.094316]  target3:0:11: FAST-80 WIDE SCSI 160.0 MB/s DT (12.5 ns, offset 63)
[    8.102910]  target3:0:11: Ending Domain Validation
[    8.105140] SCSI device sdc: 71096640 512-byte hdwr sectors (36401 MB)
[    8.106551] sdc: Write Protect is off
[    8.106577] sdc: Mode Sense: ab 00 10 08
[    8.107968] SCSI device sdc: drive cache: write through w/ FUA
[    8.109002] SCSI device sdc: 71096640 512-byte hdwr sectors (36401 MB)
[    8.110384] sdc: Write Protect is off
[    8.110409] sdc: Mode Sense: ab 00 10 08
[    8.111800] SCSI device sdc: drive cache: write through w/ FUA
[    8.111827]  sdc: sdc1
[    8.122277] sd 3:0:11:0: Attached scsi disk sdc
[    8.122495] sd 3:0:11:0: Attached scsi generic sg3 type 0
[    8.127801]   Vendor: IBM-PSG   Model: ST336704LC    !#  Rev: B230
[    8.127919]   Type:   Direct-Access                      ANSI SCSI revision: 03
[    8.127988] scsi3:A:12:0: Tagged Queuing enabled.  Depth 32
[    8.128016]  target3:0:12: Beginning Domain Validation
[    8.133776]  target3:0:12: wide asynchronous
[    8.138376]  target3:0:12: FAST-80 WIDE SCSI 160.0 MB/s DT (12.5 ns, offset 63)
[    8.149040]  target3:0:12: Ending Domain Validation
[    8.150031] SCSI device sdd: 71096640 512-byte hdwr sectors (36401 MB)
[    8.151402] sdd: Write Protect is off
[    8.151429] sdd: Mode Sense: ab 00 10 08
[    8.152796] SCSI device sdd: drive cache: write through w/ FUA
[    8.153789] SCSI device sdd: 71096640 512-byte hdwr sectors (36401 MB)
[    8.155123] sdd: Write Protect is off
[    8.155151] sdd: Mode Sense: ab 00 10 08
[    8.156503] SCSI device sdd: drive cache: write through w/ FUA
[    8.156531]  sdd: sdd1
[    8.166958] sd 3:0:12:0: Attached scsi disk sdd
[    8.167136] sd 3:0:12:0: Attached scsi generic sg4 type 0
[    8.171386]   Vendor: IBM-PSG   Model: ST336704LC    !#  Rev: B232
[    8.171513]   Type:   Direct-Access                      ANSI SCSI revision: 03
[    8.171574] scsi3:A:13:0: Tagged Queuing enabled.  Depth 32
[    8.171603]  target3:0:13: Beginning Domain Validation
[    8.177424]  target3:0:13: wide asynchronous
[    8.181813]  target3:0:13: FAST-80 WIDE SCSI 160.0 MB/s DT (12.5 ns, offset 63)
[    8.190484]  target3:0:13: Ending Domain Validation
[    8.191541] SCSI device sde: 71096640 512-byte hdwr sectors (36401 MB)
[    8.192937] sde: Write Protect is off
[    8.192964] sde: Mode Sense: ab 00 10 08
[    8.194396] SCSI device sde: drive cache: write through w/ FUA
[    8.195507] SCSI device sde: 71096640 512-byte hdwr sectors (36401 MB)
[    8.196933] sde: Write Protect is off
[    8.196960] sde: Mode Sense: ab 00 10 08
[    8.198452] SCSI device sde: drive cache: write through w/ FUA
[    8.198481]  sde: sde1
[    8.203856] sd 3:0:13:0: Attached scsi disk sde
[    8.204040] sd 3:0:13:0: Attached scsi generic sg5 type 0
[    8.208418]   Vendor: IBM-PSG   Model: ST336704LC    !#  Rev: B230
[    8.208602]   Type:   Direct-Access                      ANSI SCSI revision: 03
[    8.208698] scsi3:A:14:0: Tagged Queuing enabled.  Depth 32
[    8.208729]  target3:0:14: Beginning Domain Validation
[    8.214550]  target3:0:14: wide asynchronous
[    8.218915]  target3:0:14: FAST-80 WIDE SCSI 160.0 MB/s DT (12.5 ns, offset 63)
[    8.227440]  target3:0:14: Ending Domain Validation
[    8.228434] SCSI device sdf: 71096640 512-byte hdwr sectors (36401 MB)
[    8.229773] sdf: Write Protect is off
[    8.229800] sdf: Mode Sense: ab 00 10 08
[    8.231145] SCSI device sdf: drive cache: write through w/ FUA
[    8.232125] SCSI device sdf: 71096640 512-byte hdwr sectors (36401 MB)
[    8.233465] sdf: Write Protect is off
[    8.233491] sdf: Mode Sense: ab 00 10 08
[    8.234839] SCSI device sdf: drive cache: write through w/ FUA
[    8.234865]  sdf: sdf1
[    8.240714] sd 3:0:14:0: Attached scsi disk sdf
[    8.240910] sd 3:0:14:0: Attached scsi generic sg6 type 0
[    8.249500]   Vendor: IBM       Model: EXP300   S160     Rev: D014
[    8.249635]   Type:   Processor                          ANSI SCSI revision: 03
[    8.249702]  target3:0:15: Beginning Domain Validation
[    8.320284] (scsi3:A:15:0): refuses synchronous negotiation. Using asynchronous transfers
[    8.358185]  target3:0:15: Domain Validation skipping write tests
[    8.358206]  target3:0:15: Ending Domain Validation
[    8.358533]  3:0:15:0: Attached scsi generic sg7 type 3
[   17.071434] md: bind<dm-0>
[   17.087398] md: bind<dm-1>
[   17.100365] md: bind<dm-2>
[   17.113626] md: bind<dm-3>
[   17.125961] raid5: device dm-3 operational as raid disk 3
[   17.125982] raid5: device dm-2 operational as raid disk 2
[   17.125998] raid5: device dm-1 operational as raid disk 1
[   17.126014] raid5: device dm-0 operational as raid disk 0
[   17.129179] raid5: allocated 8358kB for md0
[   17.129205] raid5: raid level 5 set md0 active with 4 out of 4 devices, algorithm 0
[   17.129224] RAID5 conf printout:
[   17.129236]  --- rd:4 wd:4 fd:0
[   17.129250]  disk 0, o:1, dev:dm-0
[   17.129263]  disk 1, o:1, dev:dm-1
[   17.129277]  disk 2, o:1, dev:dm-2
[   17.129291]  disk 3, o:1, dev:dm-3
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Tiberizzle
n00b
n00b


Joined: 20 Nov 2006
Posts: 8

PostPosted: Thu Dec 28, 2006 7:17 pm    Post subject: Reply with quote

Also seems to be running into the same bottleneck sans the software RAID layer:

Code:
supernova ~ # hdparm -t /dev/sdc & hdparm -t /dev/sdd & hdparm -t /dev/sde & hdparm -t /dev/sdf
[1] 7502
[2] 7503
[3] 7504

/dev/sdc:

/dev/sdd:

/dev/sde:

/dev/sdf:
 Timing O_DIRECT disk reads:   Timing O_DIRECT disk reads:   Timing O_DIRECT disk reads:   Timing O_DIRECT disk reads:   
 40 MB in  3.01 seconds =  13.31 MB/sec
 52 MB in  3.03 seconds =  17.17 MB/sec
 52 MB in  3.04 seconds =  17.13 MB/sec
 46 MB in  3.08 seconds =  14.94 MB/sec
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