Re: Linux 2.6.16 - SATA read performance drop ~50% on Intel 82801GB/GR/GH

Andreas Schnaiter wrote:

Hi,
after upgrading from linux 2.6.15.7 to 2.6.16.2 I noticed an extreme slowdownof the SATA disks on my system. Writing/reading a 8GB file showed thatreading performes with less than half the speed on 2.6.16 (strangely hdparmshows almost no difference).The two affected disks are connected to the Intel 82801GB/GR/GH (ICH7 Family)Serial ATA Controller.
Disks on the Silicon Image/Intel IDE Controllers are not affected.
I didn't have the chance yet to test if this problem also exists on theSilicon Image SATA Controller.
Please tell me if there is any other useful information I can provide =)

Assuming that you reproduce this switching back to the old kernel, thatkind of lets the hardware out as the cause. I have to do measurements onan SATA system to comment further.



Linux 2.6.15.7
---
# time dd if=/dev/zero of=/benchfile bs=1M count=8192
8192+0 records in
8192+0 records out
8589934592 bytes (8.6 GB) copied, 132.224 seconds, 65.0 MB/s

real	2m12.347s
user	0m0.018s
sys	0m18.398s

# time dd if=/benchfile of=/dev/null bs=1M
8192+0 records in
8192+0 records out
8589934592 bytes (8.6 GB) copied, 130.547 seconds, 65.8 MB/s

real	2m10.670s
user	0m0.023s
sys	0m14.238s

# hdparm -tT /dev/sdb

/dev/sdb:
 Timing cached reads:   4488 MB in  2.00 seconds = 2244.34 MB/sec
 Timing buffered disk reads:  212 MB in  3.02 seconds =  70.30 MB/sec


Linux 2.6.16.2
---
# time dd if=/dev/zero of=/benchfile bs=1M count=8192
8192+0 records in
8192+0 records out
8589934592 bytes (8.6 GB) copied, 122.256 seconds, 70.3 MB/s

real	2m2.460s
user	0m0.013s
sys	0m17.971s

# time dd if=/benchfile of=/dev/null bs=1M
8192+0 records in
8192+0 records out
8589934592 bytes (8.6 GB) copied, 302.452 seconds, 28.4 MB/s

real	5m3.100s
user	0m0.021s
sys	0m40.521s

# hdparm -tT /dev/sdb

/dev/sdb:
 Timing cached reads:   4520 MB in  2.00 seconds = 2264.99 MB/sec
 Timing buffered disk reads:  212 MB in  3.03 seconds =  70.03 MB/sec


# lspci -v
00:00.0 Host bridge: Intel Corporation 955X Memory Controller Hub
        Subsystem: Intel Corporation: Unknown device 4b42
        Flags: bus master, fast devsel, latency 0
        Capabilities: [e0] #09 [2109]

00:01.0 PCI bridge: Intel Corporation 955X PCI Express Graphics Port (prog-if00 [Normal decode])

        Flags: bus master, fast devsel, latency 0
        Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
        Memory behind bridge: 90000000-91ffffff
        Prefetchable memory behind bridge: 0000000080000000-000000008ff00000
        Capabilities: [88] #0d [0000]
        Capabilities: [80] Power Management version 2

Capabilities: [90] Message Signalled Interrupts: 64bit- Queue=0/0Enable-

        Capabilities: [a0] #10 [0141]

00:1b.0 Class 0403: Intel Corporation 82801G (ICH7 Family) High DefinitionAudio Controller (rev 01)

        Subsystem: Intel Corporation: Unknown device 0013
        Flags: bus master, fast devsel, latency 0, IRQ 19
        Memory at 92200000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: [50] Power Management version 2

Capabilities: [60] Message Signalled Interrupts: 64bit+ Queue=0/0Enable-

        Capabilities: [70] #10 [0091]

00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1(rev 01) (prog-if 00 [Normal decode])

        Flags: bus master, fast devsel, latency 0
        Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
        Memory behind bridge: 92300000-923fffff
        Capabilities: [40] #10 [0141]

Capabilities: [80] Message Signalled Interrupts: 64bit- Queue=0/0Enable-

        Capabilities: [90] #0d [0000]
        Capabilities: [a0] Power Management version 2

00:1c.4 PCI bridge: Intel Corporation 82801GR/GH/GHM (ICH7 Family) PCI ExpressPort 5 (rev 01) (prog-if 00 [Normal decode])

        Flags: bus master, fast devsel, latency 0
        Bus: primary=00, secondary=03, subordinate=03, sec-latency=0
        Memory behind bridge: 92400000-924fffff
        Capabilities: [40] #10 [0141]

Capabilities: [80] Message Signalled Interrupts: 64bit- Queue=0/0Enable-

        Capabilities: [90] #0d [0000]
        Capabilities: [a0] Power Management version 2

00:1c.5 PCI bridge: Intel Corporation 82801GR/GH/GHM (ICH7 Family) PCI ExpressPort 6 (rev 01) (prog-if 00 [Normal decode])

        Flags: bus master, fast devsel, latency 0
        Bus: primary=00, secondary=04, subordinate=04, sec-latency=0
        I/O behind bridge: 00002000-00002fff
        Memory behind bridge: 92100000-921fffff
        Capabilities: [40] #10 [0141]

Capabilities: [80] Message Signalled Interrupts: 64bit- Queue=0/0Enable-

        Capabilities: [90] #0d [0000]
        Capabilities: [a0] Power Management version 2

00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #1(rev 01) (prog-if 00 [UHCI])

        Subsystem: Intel Corporation: Unknown device 4b42
        Flags: bus master, medium devsel, latency 0, IRQ 21
        I/O ports at 3080 [size=32]

00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #2(rev 01) (prog-if 00 [UHCI])

        Subsystem: Intel Corporation: Unknown device 4b42
        Flags: bus master, medium devsel, latency 0, IRQ 20
        I/O ports at 3060 [size=32]

00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #3(rev 01) (prog-if 00 [UHCI])

        Subsystem: Intel Corporation: Unknown device 4b42
        Flags: bus master, medium devsel, latency 0, IRQ 18
        I/O ports at 3040 [size=32]

00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #4(rev 01) (prog-if 00 [UHCI])

        Subsystem: Intel Corporation: Unknown device 4b42
        Flags: bus master, medium devsel, latency 0, IRQ 16
        I/O ports at 3020 [size=32]

00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCIController (rev 01) (prog-if 20 [EHCI])

        Subsystem: Intel Corporation: Unknown device 4b42
        Flags: bus master, medium devsel, latency 0, IRQ 21
        Memory at 92204400 (32-bit, non-prefetchable) [size=1K]
        Capabilities: [50] Power Management version 2
        Capabilities: [58] #0a [20a0]

00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1) (prog-if 01[Subtractive decode])

        Flags: bus master, fast devsel, latency 0
        Bus: primary=00, secondary=05, subordinate=05, sec-latency=32
        I/O behind bridge: 00001000-00001fff
        Memory behind bridge: 92000000-920fffff
        Prefetchable memory behind bridge: 0000000092500000-0000000092500000
        Capabilities: [50] #0d [0000]

00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC InterfaceBridge (rev 01)

        Subsystem: Intel Corporation: Unknown device 4b42
        Flags: bus master, medium devsel, latency 0
        Capabilities: [e0] #09 [100c]

00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller(rev 01) (prog-if 8a [Master SecP PriP])

        Subsystem: Intel Corporation: Unknown device 4b42
        Flags: bus master, medium devsel, latency 0, IRQ 18
        I/O ports at <unassigned>
        I/O ports at <unassigned>
        I/O ports at <unassigned>
        I/O ports at <unassigned>
        I/O ports at 30b0 [size=16]

00:1f.2 IDE interface: Intel Corporation 82801GB/GR/GH (ICH7 Family) SerialATA Storage Controllers cc=IDE (rev 01) (prog-if 8f [Master SecP SecO PriPPriO])

        Subsystem: Intel Corporation: Unknown device 4b42
        Flags: bus master, 66Mhz, medium devsel, latency 0, IRQ 20
        I/O ports at 30c8 [size=8]
        I/O ports at 30e4 [size=4]
        I/O ports at 30c0 [size=8]
        I/O ports at 30e0 [size=4]
        I/O ports at 30a0 [size=16]
        Memory at 92204000 (32-bit, non-prefetchable) [size=1K]
        Capabilities: [70] Power Management version 2

00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev01)

        Subsystem: Intel Corporation: Unknown device 4b42
        Flags: medium devsel, IRQ 9
        I/O ports at 3000 [size=32]

01:00.0 VGA compatible controller: nVidia Corporation GeForce 6200TurboCache(TM) (rev a1) (prog-if 00 [VGA])

        Subsystem: nVidia Corporation: Unknown device 025d
        Flags: bus master, fast devsel, latency 0, IRQ 16
        Memory at 91000000 (32-bit, non-prefetchable) [size=16M]
        Memory at 80000000 (64-bit, prefetchable) [size=256M]
        Memory at 90000000 (64-bit, non-prefetchable) [size=16M]
        Capabilities: [60] Power Management version 2

Capabilities: [68] Message Signalled Interrupts: 64bit+ Queue=0/0Enable-

        Capabilities: [78] #10 [0001]

04:00.0 Ethernet controller: Intel Corporation 82573V Gigabit EthernetController (Copper) (rev 03)

        Subsystem: Intel Corporation: Unknown device 3083
        Flags: bus master, fast devsel, latency 0, IRQ 17
        Memory at 92100000 (32-bit, non-prefetchable) [size=128K]
        I/O ports at 2000 [size=32]
        Capabilities: [c8] Power Management version 2

Capabilities: [d0] Message Signalled Interrupts: 64bit+ Queue=0/0Enable-

        Capabilities: [e0] #10 [0001]

05:00.0 Multimedia audio controller: Creative Labs SB Audigy (rev 04)
        Subsystem: Creative Labs SB Audigy 2 ZS (SB0350)
        Flags: bus master, medium devsel, latency 32, IRQ 22
        I/O ports at 1100 [size=64]
        Capabilities: [dc] Power Management version 2

05:00.1 Input device controller: Creative Labs SB Audigy MIDI/Game port (rev04)

        Subsystem: Creative Labs SB Audigy MIDI/Game Port
        Flags: bus master, medium devsel, latency 32
        I/O ports at 1180 [size=8]
        Capabilities: [dc] Power Management version 2

05:00.2 FireWire (IEEE 1394): Creative Labs SB Audigy FireWire Port (rev 04)(prog-if 10 [OHCI])

        Subsystem: Creative Labs SB Audigy FireWire Port
        Flags: bus master, medium devsel, latency 32, IRQ 19
        Memory at 92008800 (32-bit, non-prefetchable) [size=2K]
        Memory at 92004000 (32-bit, non-prefetchable) [size=16K]
        Capabilities: [44] Power Management version 2

05:01.0 RAID bus controller: Silicon Image, Inc. PCI0680 Ultra ATA-133 HostController (rev 02)

        Subsystem: Silicon Image, Inc. Winic W-680 (Silicon Image 680 based)
        Flags: bus master, medium devsel, latency 32, IRQ 19
        I/O ports at 1178 [size=8]
        I/O ports at 1194 [size=4]
        I/O ports at 1170 [size=8]
        I/O ports at 1190 [size=4]
        I/O ports at 1150 [size=16]
        Memory at 92009500 (32-bit, non-prefetchable) [size=256]
        Expansion ROM at fff80000 [disabled] [size=512K]
        Capabilities: [60] Power Management version 2

05:02.0 Ethernet controller: Realtek Semiconductor Co., Ltd.RTL-8139/8139C/8139C+ (rev 10)

        Subsystem: Realtek Semiconductor Co., Ltd. RT8139
        Flags: bus master, medium devsel, latency 32, IRQ 18
        I/O ports at 1000 [size=256]
        Memory at 92009400 (32-bit, non-prefetchable) [size=256]
        Expansion ROM at 92580000 [disabled] [size=64K]
        Capabilities: [50] Power Management version 2

05:04.0 FireWire (IEEE 1394): Texas Instruments TSB82AA2 IEEE-1394b Link LayerController (rev 01) (prog-if 10 [OHCI])

        Subsystem: Intel Corporation: Unknown device 4b42
        Flags: bus master, medium devsel, latency 32, IRQ 18
        Memory at 92008000 (32-bit, non-prefetchable) [size=2K]
        Memory at 92000000 (32-bit, non-prefetchable) [size=16K]
        Capabilities: [44] Power Management version 2

05:05.0 RAID bus controller: Silicon Image, Inc. SiI 3114 [SATALink/SATARaid]Serial ATA Controller (rev 02)

        Subsystem: Intel Corporation: Unknown device 7114
        Flags: bus master, 66Mhz, medium devsel, latency 32, IRQ 17
        I/O ports at 1168 [size=8]
        I/O ports at 118c [size=4]
        I/O ports at 1160 [size=8]
        I/O ports at 1188 [size=4]
        I/O ports at 1140 [size=16]
        Memory at 92009000 (32-bit, non-prefetchable) [size=1K]
        Expansion ROM at 92500000 [disabled] [size=512K]
        Capabilities: [60] Power Management version 2


---
regards,
Andreas



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References:
- Linux 2.6.16 - SATA read performance drop ~50% on Intel 82801GB/GR/GH
  - From: Andreas Schnaiter <[email protected]>

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