Replying to my own post ...

I have done a test on the same machine comparing 6.3-p1 to 7.1-PRE. The performance is the expected ~6MB/s (because of the lack of cache) on 6.3-p1, so the BIOS change doesn't seem to be at fault.

This seems to be a regression somewhere between 6.3 to 7.1. The Areca driver is the same in 6.3 and 7.1, so the problem seems to be elsewhere.

I think this is more than just a "performance" problem. The observations with gstat showing extremely high ms/w values (I have seen them as high as 22000) makes it look like IO completion interrupts are being lost.

Any suggestions on where to look next?  Are there obvious candidates?


Jan Mikkelsen wrote:
Hi,

I am seeing extremely poor performance (~100kB/s) when untaring large tar files into fresh ufs filesystems. I see the problem with softupdates and without softupdates but with an async mount. This is a Supermicro X7DB8 board, 4GB, 2 x Xeon 5140.

Sample gstat output:

dT: 1.033s  w: 1.000s
L(q)  ops/s    r/s   kBps   ms/r    w/s   kBps   ms/w   %busy Name
 585     61      0      0    0.0     61    170 13812.0  100.1| da2

I see ms/w start at about 200ms with a ~3MB/s throughput, and then I see ms/w rise and kBps drop. ms/w goes as high as 16-20s, and then suddenly drops back down to about 200ms. Using iostat, while the performance is high(er), kb/t is 64kB, as the problem starts it drops towards 2kB.

Copying a single large file doesn't exhibit this problem, although throughput isn't great (~3-5MB/s). However, that's better that 100kB/s.

arcmsr0: <Areca SATA Host Adapter RAID Controller (RAID6 capable)
mem 0xd8900000-0xd8900fff,0xd8000000-0xd83fffff irq 16 at device 14.0 on pci10
ARECA RAID ADAPTER0: Driver Version 1.20.00.15 2007-10-07
ARECA RAID ADAPTER0: FIRMWARE VERSION V1.46 2008-08-06
arcmsr0: [ITHREAD]

There are eight disks connected in a RAID-6 configuration. The controller's cache is write-through and the disks' write caches are disabled. NCQ is enabled on the drives.

The same hardware when it ran 6.3-p1 didn't have this problem. However, the system BIOS was updated at the same time as the operating system (in an attempt to solve a recent em problem), so it is possible that it is a BIOS related problem. The same build on an entirely different machine with an aac controller and SAS disks also doesn't show this problem.

Running 'devinfo -r' doesn't list arcmsr as having an interrupt at all. (see below). That strikes me as odd; checking another machine that is still running 6.2 with an arcmsr controller, I can see the interrupt just fine.

So:

- Does anyone have any suggestions?

- Is it normal for arcmsr to not show an interrupt in the output from devinfo in 7.1?

Full dmesg, devinfo below.

Thanks,

Jan Mikkelsen


Copyright (c) 1992-2008 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 7.1-PRERELEASE #0: Mon Dec  1 14:53:12 EST 2008
[EMAIL PROTECTED]:/home/janm/p4/freebsd-image-std-2008.2/work/base-freebsd/home/janm/p4/freebsd-image-std-2008.2/FreeBSD/src/sys/TW-SMP
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Xeon(R) CPU 5140 @ 2.33GHz (2333.35-MHz K8-class CPU)
 Origin = "GenuineIntel"  Id = 0x6f6  Stepping = 6
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE> Features2=0x4e3bd<SSE3,RSVD2,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,DCA>
 AMD Features=0x20100800<SYSCALL,NX,LM>
 AMD Features2=0x1<LAHF>
 Cores per package: 2
usable memory = 4280651776 (4082 MB)
avail memory  = 4117843968 (3927 MB)
ACPI APIC Table: <PTLTD    APIC  >
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
cpu0 (BSP): APIC ID:  0
cpu1 (AP): APIC ID:  1
cpu2 (AP): APIC ID:  6
cpu3 (AP): APIC ID:  7
ioapic0 <Version 2.0> irqs 0-23 on motherboard
ioapic1 <Version 2.0> irqs 24-47 on motherboard
kbd1 at kbdmux0
ath_hal: 0.9.20.3 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413, RF5413)
acpi0: <SMCI SMCISLP2> on motherboard
acpi0: [ITHREAD]
acpi0: Power Button (fixed)
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x1008-0x100b on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pcib1: <ACPI PCI-PCI bridge> at device 2.0 on pci0
pci1: <ACPI PCI bus> on pcib1
pcib2: <ACPI PCI-PCI bridge> irq 16 at device 0.0 on pci1
pci2: <ACPI PCI bus> on pcib2
pcib3: <ACPI PCI-PCI bridge> irq 16 at device 0.0 on pci2
pci3: <ACPI PCI bus> on pcib3
pcib4: <ACPI PCI-PCI bridge> at device 0.0 on pci3
pci4: <ACPI PCI bus> on pcib4
ahd0: <Adaptec AIC7902 Ultra320 SCSI adapter> port 0x2400-0x24ff,0x2000-0x20ff mem 0xd8500000-0xd8501fff irq 16 at device 2.0 on pci4
ahd0: [ITHREAD]
aic7902: Ultra320 Wide Channel A, SCSI Id=7, PCI-X 67-100Mhz, 512 SCBs
ahd1: <Adaptec AIC7902 Ultra320 SCSI adapter> port 0x2c00-0x2cff,0x2800-0x28ff mem 0xd8502000-0xd8503fff irq 17 at device 2.1 on pci4
ahd1: [ITHREAD]
aic7902: Ultra320 Wide Channel B, SCSI Id=7, PCI-X 67-100Mhz, 512 SCBs
pcib5: <ACPI PCI-PCI bridge> at device 0.2 on pci3
pci5: <ACPI PCI bus> on pcib5
bge0: <Altima Gigabit Ethernet Controller, ASIC rev. 0x105> mem 0xd8600000-0xd860ffff irq 16 at device 1.0 on pci5
miibus0: <MII bus> on bge0
brgphy0: <BCM5701 10/100/1000baseTX PHY> PHY 1 on miibus0
brgphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-FDX, auto
bge0: Ethernet address: 00:40:f4:66:b1:56
bge0: [ITHREAD]
pcib6: <ACPI PCI-PCI bridge> irq 18 at device 2.0 on pci2
pci6: <ACPI PCI bus> on pcib6
em0: <Intel(R) PRO/1000 Network Connection 6.9.6> port 0x3000-0x301f mem 0xd8400000-0xd841ffff irq 18 at device 0.0 on pci6
em0: Using MSI interrupt
em0: [FILTER]
em0: Ethernet address: 00:30:48:31:67:86
em1: <Intel(R) PRO/1000 Network Connection 6.9.6> port 0x3020-0x303f mem 0xd8420000-0xd843ffff irq 19 at device 0.1 on pci6
em1: Using MSI interrupt
em1: [FILTER]
em1: Ethernet address: 00:30:48:31:67:87
pcib7: <ACPI PCI-PCI bridge> at device 0.3 on pci1
pci7: <ACPI PCI bus> on pcib7
pcib8: <ACPI PCI-PCI bridge> at device 4.0 on pci0
pci8: <ACPI PCI bus> on pcib8
pcib9: <ACPI PCI-PCI bridge> at device 6.0 on pci0
pci9: <ACPI PCI bus> on pcib9
pcib10: <PCI-PCI bridge> at device 0.0 on pci9
pci10: <PCI bus> on pcib10
arcmsr0: <Areca SATA Host Adapter RAID Controller (RAID6 capable)
mem 0xd8900000-0xd8900fff,0xd8000000-0xd83fffff irq 16 at device 14.0 on pci10
ARECA RAID ADAPTER0: Driver Version 1.20.00.15 2007-10-07
ARECA RAID ADAPTER0: FIRMWARE VERSION V1.46 2008-08-06
arcmsr0: [ITHREAD]
pcib11: <PCI-PCI bridge> at device 0.2 on pci9
pci11: <PCI bus> on pcib11
pci0: <base peripheral> at device 8.0 (no driver attached)
pcib12: <ACPI PCI-PCI bridge> irq 17 at device 28.0 on pci0
pci12: <ACPI PCI bus> on pcib12
uhci0: <Intel 631XESB/632XESB/3100 USB controller USB-1> port 0x1800-0x181f irq 17 at device 29.0 on pci0
uhci0: [GIANT-LOCKED]
uhci0: [ITHREAD]
usb0: <Intel 631XESB/632XESB/3100 USB controller USB-1> on uhci0
usb0: USB revision 1.0
uhub0: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb0
uhub0: 2 ports with 2 removable, self powered
uhci1: <Intel 631XESB/632XESB/3100 USB controller USB-2> port 0x1820-0x183f irq 19 at device 29.1 on pci0
uhci1: [GIANT-LOCKED]
uhci1: [ITHREAD]
usb1: <Intel 631XESB/632XESB/3100 USB controller USB-2> on uhci1
usb1: USB revision 1.0
uhub1: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb1
uhub1: 2 ports with 2 removable, self powered
uhci2: <Intel 631XESB/632XESB/3100 USB controller USB-3> port 0x1840-0x185f irq 18 at device 29.2 on pci0
uhci2: [GIANT-LOCKED]
uhci2: [ITHREAD]
usb2: <Intel 631XESB/632XESB/3100 USB controller USB-3> on uhci2
usb2: USB revision 1.0
uhub2: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb2
uhub2: 2 ports with 2 removable, self powered
ehci0: <Intel 63XXESB USB 2.0 controller> mem 0xd8c00400-0xd8c007ff irq 17 at device 29.7 on pci0
ehci0: [GIANT-LOCKED]
ehci0: [ITHREAD]
usb3: EHCI version 1.0
usb3: companion controllers, 2 ports each: usb0 usb1 usb2
usb3: <Intel 63XXESB USB 2.0 controller> on ehci0
usb3: USB revision 2.0
uhub3: <Intel EHCI root hub, class 9/0, rev 2.00/1.00, addr 1> on usb3
uhub3: 6 ports with 6 removable, self powered
pcib13: <ACPI PCI-PCI bridge> at device 30.0 on pci0
pci13: <ACPI PCI bus> on pcib13
vgapci0: <VGA-compatible display> port 0x4000-0x40ff mem 0xd0000000-0xd7ffffff,0xd8800000-0xd880ffff irq 18 at device 1.0 on pci13
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel 63XXESB2 UDMA100 controller> port 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0x1860-0x186f at device 31.1 on pci0
ata0: <ATA channel 0> on atapci0
ata0: [ITHREAD]
pci0: <serial bus, SMBus> at device 31.3 (no driver attached)
acpi_button0: <Power Button> on acpi0
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
atkbd0: [ITHREAD]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: [GIANT-LOCKED]
psm0: [ITHREAD]
psm0: model Generic PS/2 mouse, device ID 0
sio0: configured irq 4 not in bitmap of probed irqs 0
sio0: port may not be enabled
sio0: configured irq 4 not in bitmap of probed irqs 0
sio0: port may not be enabled
sio0: <16550A-compatible COM port> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
sio0: type 16550A
sio0: [FILTER]
sio1: configured irq 3 not in bitmap of probed irqs 0
sio1: port may not be enabled
sio1: configured irq 3 not in bitmap of probed irqs 0
sio1: port may not be enabled
sio1: <16550A-compatible COM port> port 0x2f8-0x2ff irq 3 on acpi0
sio1: type 16550A
sio1: [FILTER]
fdc0: <floppy drive controller> port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on acpi0
fdc0: [FILTER]
ppc0: <Parallel port> port 0x378-0x37f,0x778-0x77f irq 7 drq 3 on acpi0
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/9 bytes threshold
ppbus0: <Parallel port bus> on ppc0
ppbus0: [ITHREAD]
plip0: <PLIP network interface> on ppbus0
plip0: WARNING: using obsoleted IFF_NEEDSGIANT flag
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
ppc0: [GIANT-LOCKED]
ppc0: [ITHREAD]
cpu0: <ACPI CPU> on acpi0
est0: <Enhanced SpeedStep Frequency Control> on cpu0
p4tcc0: <CPU Frequency Thermal Control> on cpu0
cpu1: <ACPI CPU> on acpi0
est1: <Enhanced SpeedStep Frequency Control> on cpu1
p4tcc1: <CPU Frequency Thermal Control> on cpu1
cpu2: <ACPI CPU> on acpi0
est2: <Enhanced SpeedStep Frequency Control> on cpu2
p4tcc2: <CPU Frequency Thermal Control> on cpu2
cpu3: <ACPI CPU> on acpi0
est3: <Enhanced SpeedStep Frequency Control> on cpu3
p4tcc3: <CPU Frequency Thermal Control> on cpu3
orm0: <ISA Option ROM> at iomem 0xc0000-0xcafff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
Timecounters tick every 1.000 msec
acd0: DVDR <PIONEER DVD-RW DVR-111D/1.23> at ata0-master UDMA66
Waiting 5 seconds for SCSI devices to settle
(probe46:arcmsr0:0:16:0): inquiry data fails comparison at DV1 step
da0 at arcmsr0 bus 0 target 0 lun 0
da0: <Areca ARC-1220-VOL#00 R001> Fixed Direct Access SCSI-5 device
da0: 166.666MB/s transfers (83.333MHz DT, offset 32, 16bit)
da0: 77247MB (158201856 512 byte sectors: 255H 63S/T 9847C)
da1 at arcmsr0 bus 0 target 1 lun 0
da1: <Areca ARC-1220-VOL#01 R001> Fixed Direct Access SCSI-5 device
da1: 166.666MB/s transfers (83.333MHz DT, offset 32, 16bit)
da1: 953673MB (1953122304 512 byte sectors: 255H 63S/T 121576C)
da2 at arcmsr0 bus 0 target 2 lun 0
da2: <Areca ARC-1220-VOL#02 R001> Fixed Direct Access SCSI-5 device
da2: 166.666MB/s transfers (83.333MHz DT, offset 32, 16bit)
da2: 800131MB (1638669312 512 byte sectors: 255H 63S/T 102002C)
sa0 at ahd1 bus 0 target 6 lun 0
sa0: <SEAGATE DAT 04106-XXX 7600> Removable Sequential Access SCSI-2 device
sa0: 10.000MB/s transfers (10.000MHz, offset 15)
SMP: AP CPU #1 Launched!
SMP: AP CPU #3 Launched!
SMP: AP CPU #2 Launched!
Trying to mount root from ufs:/dev/da0s2a
This module (opensolaris) contains code covered by the
Common Development and Distribution License (CDDL)
see http://opensolaris.org/os/licensing/opensolaris_license/
WARNING: ZFS is considered to be an experimental feature in FreeBSD.
ZFS filesystem version 6
ZFS storage pool version 6
bge0: link state changed to UP
em0: link state changed to UP
em1: link state changed to UP


nexus0
 acpi0
     Interrupt request lines:
         9
     I/O ports:
         0x10-0x1f
         0x24-0x25
         0x28-0x29
         0x2c-0x2d
         0x2e-0x2f
         0x30-0x31
         0x34-0x35
         0x38-0x39
         0x3c-0x3d
         0x4e-0x4f
         0x50-0x53
         0x63
         0x65
         0x67
         0x72-0x77
         0x80
         0x90-0x9f
         0xa4-0xa5
         0xa8-0xa9
         0xac-0xad
         0xb0-0xb5
         0xb8-0xb9
         0xbc-0xbd
         0x295-0x296
         0x4d0-0x4d1
         0x800-0x80f
         0xca2-0xca3
         0xca8-0xcaf
         0x1000-0x107f
         0x1180-0x11bf
         0xfe00
     I/O memory addresses:
         0xe0000000-0xefffffff
         0xfe000000-0xfe01ffff
         0xfe600000-0xfe6fffff
         0xfec80000-0xfec80fff
         0xfed1c000-0xfed1ffff
         0xfee00000-0xfee0ffff
   cpu0
     acpi_perf0
     est0
     p4tcc0
     cpufreq0
   cpu1
     acpi_perf1
     est1
     p4tcc1
     cpufreq1
   cpu2
     acpi_perf2
     est2
     p4tcc2
     cpufreq2
   cpu3
     acpi_perf3
     est3
     p4tcc3
     cpufreq3
   pcib0
     pci0
       hostb0
       pcib1
         pci1
           pcib2
             pci2
               pcib3
                 pci3
                   pcib4
                     pci4
                       ahd0
                           Interrupt request lines:
                               16
                           I/O ports:
                               0x2000-0x20ff
                               0x2400-0x24ff
                           I/O memory addresses:
                               0xd8500000-0xd8501fff
                       ahd1
                           Interrupt request lines:
                               17
                           I/O ports:
                               0x2800-0x28ff
                               0x2c00-0x2cff
                           I/O memory addresses:
                               0xd8502000-0xd8503fff
                   pcib5
                     pci5
                       bge0
                           I/O memory addresses:
                               0xd8600000-0xd860ffff
                         miibus0
                           brgphy0
               pcib6
                 pci6
                   em0
                       Interrupt request lines:
                           256
                       I/O ports:
                           0x3000-0x301f
                       I/O memory addresses:
                           0xd8400000-0xd841ffff
                   em1
                       Interrupt request lines:
                           257
                       I/O ports:
                           0x3020-0x303f
                       I/O memory addresses:
                           0xd8420000-0xd843ffff
           pcib7
             pci7
       pcib8
         pci8
       pcib9
         pci9
           pcib10
             pci10
               arcmsr0
                   I/O memory addresses:
                       0xd8000000-0xd83fffff
                       0xd8900000-0xd8900fff
           pcib11
             pci11
       hostb1
       hostb2
       hostb3
       hostb4
       hostb5
       hostb6
       hostb7
       pcib12
         pci12
       uhci0
           I/O ports:
               0x1800-0x181f
         usb0
           uhub0
       uhci1
           Interrupt request lines:
               19
           I/O ports:
               0x1820-0x183f
         usb1
           uhub1
       uhci2
           Interrupt request lines:
               18
           I/O ports:
               0x1840-0x185f
         usb2
           uhub2
       ehci0
           I/O memory addresses:
               0xd8c00400-0xd8c007ff
         usb3
           uhub3
       pcib13
         pci13
           vgapci0
               I/O ports:
                   0x4000-0x40ff
               I/O memory addresses:
                   0xd0000000-0xd7ffffff
                   0xd8800000-0xd880ffff
       isab0
         isa0
           sc0
           vga0
               I/O ports:
                   0x3c0-0x3df
               I/O memory addresses:
                   0xa0000-0xbffff
           orm0
               I/O memory addresses:
                   0xc0000-0xcafff
       atapci0
           I/O ports:
               0x170-0x177
               0x1f0-0x1f7
               0x376
               0x3f6
               0x1860-0x186f
         ata0
             Interrupt request lines:
                 14
           acd0
   acpi_sysresource0
   atdma0
   fpupnp0
   attimer0
   attimer1
   pci_link0
   pci_link1
   pci_link2
   pci_link3
   pci_link4
   pci_link5
   pci_link6
   pci_link7
   atkbdc0
       I/O ports:
           0x60
           0x64
     atkbd0
         Interrupt request lines:
             1
     psm0
         Interrupt request lines:
             12
   psmcpnp0
   sio0
       Interrupt request lines:
           4
       I/O ports:
           0x3f8-0x3ff
   sio1
       Interrupt request lines:
           3
       I/O ports:
           0x2f8-0x2ff
   fdc0
       Interrupt request lines:
           6
       DMA request lines:
           2
       I/O ports:
           0x3f0-0x3f5
           0x3f7
   ppc0
       Interrupt request lines:
           7
       DMA request lines:
           3
       I/O ports:
           0x378-0x37f
     ppbus0
       plip0
       lpt0
       ppi0
   acpi_button0
   acpi_timer0
       ACPI I/O ports:
           0x1008-0x100b
 apic0
     I/O memory addresses:
         0xfec00000-0xfec0001f
 ram0
     I/O memory addresses:
         0x0-0x9dfff
         0x100000-0xcff4ffff
         0x100000000-0x12fffffff

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