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SubjectRe: [IDE SiI680] throughput drop to 1/4


There should be a mode or a flag option in the siimage.h to disable MMIO
by default. I am courious if this is a BARRIER on the read/write screwing
the pooch!


On Mon, 24 Mar 2003, Vitezslav Samel wrote:

> Hi!
>
> Recently I tried to figure out in 2.5.65, why throughput on my disk which
> hangs on Silicon Image 680 dropped to 1/4 compared to 2.4.21-pre5, but didn't
> found anything useful. Are there any known issues with this driver?
> Comparing those two drivers - they are exactly the same. Cabling is OK
> (with 80w cable), the driver correctly detects this (checked with this simple
> patch:
>
> diff -urN -X dontdiff linux-2.5.65/drivers/ide/pci/siimage.c linux-2.5.65-sii/drivers/ide/pci/siimage.c
> --- linux-2.5.65/drivers/ide/pci/siimage.c 2003-02-25 21:30:39.000000000 +0100
> +++ linux-2.5.65-sii/drivers/ide/pci/siimage.c 2003-03-23 21:36:37.000000000 +0100
> @@ -90,8 +90,11 @@
> break;
> default: return 0;
> }
> - if (!eighty_ninty_three(drive))
> + if (!eighty_ninty_three(drive)) {
> mode = min(mode, (u8)1);
> + printk(KERN_DEBUG "SiI680: using 40w cable\n");
> + } else
> + printk(KERN_DEBUG "SiI680: using 80w cable\n");
> return mode;
> }
>
> Throughput measured with hdparm-5.3:
>
> 2.4.21-pre5 2.5.65
> ----------- ------
> Timing buffer-cache reads: 88.0 MB/sec 88.0 MB/sec
> Timing buffered disk reads: 40.0 MB/sec 11.6 MB/sec
>
> Machine: Intel Celeron-333
> 320 MiB RAM
> 1st disk: WDC AC24300L (on integrated piix IDE)
> 2nd disk: ST380021A (on SiI680: the only thing on this interface)
>
>
>
> Thanks,
> Vita
>
>
> ---- lspci: -------------------
> 00:10.0 RAID bus controller: CMD Technology Inc PCI0680 (rev 02)
> Subsystem: CMD Technology Inc: Unknown device 3680
> Flags: bus master, medium devsel, latency 64, IRQ 10
> I/O ports at d400 [size=8]
> I/O ports at d800 [size=4]
> I/O ports at dc00 [size=8]
> I/O ports at e000 [size=4]
> I/O ports at e400 [size=16]
> Memory at e8000000 (32-bit, non-prefetchable) [size=256]
> Expansion ROM at e7000000 [disabled] [size=512K]
> Capabilities: [60] Power Management version 2
> ---- dmesg: 2.4.21-pre5 -------
> [snipped]
> ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
> PIIX4: IDE controller at PCI slot 00:07.1
> PIIX4: chipset revision 1
> PIIX4: not 100% native mode: will probe irqs later
> ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:pio, hdb:pio
> ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:pio, hdd:pio
> SiI680: IDE controller at PCI slot 00:10.0
> PCI: Found IRQ 10 for device 00:10.0
> SiI680: chipset revision 2
> SiI680: not 100% native mode: will probe irqs later
> SiI680: BASE CLOCK == 133
> ide2: MMIO-DMA at 0xd4800000-0xd4800007, BIOS settings: hde:pio, hdf:pio
> ide3: MMIO-DMA at 0xd4800008-0xd480000f, BIOS settings: hdg:pio, hdh:pio
> hda: WDC AC24300L, ATA DISK drive
> hdc: TOSHIBA CD-ROM XM-6702B, ATAPI CD/DVD-ROM drive
> hdd: IOMEGA ZIP 100 ATAPI Floppy, ATAPI FLOPPY drive
> hde: ST380021A, ATA DISK drive
> ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> ide1 at 0x170-0x177,0x376 on irq 15
> ide2 at 0xd4800080-0xd4800087,0xd480008a on irq 10
> hda: task_no_data_intr: status=0x51 { DriveReady SeekComplete Error }
> hda: task_no_data_intr: error=0x04 { DriveStatusError }
> hda: host protected area => 1
> hda: 8421840 sectors (4312 MB) w/256KiB Cache, CHS=524/255/63
> hde: host protected area => 1
> hde: 156301488 sectors (80026 MB) w/2048KiB Cache, CHS=155061/16/63
> hdc: ATAPI 48X CD-ROM drive, 128kB Cache
> Uniform CD-ROM driver Revision: 3.12
> ide-floppy driver 0.99.newide
> hdd: No disk in drive
> hdd: 98304kB, 96/64/32 CHS, 4096 kBps, 512 sector size, 2941 rpm
> Partition check:
> hda: hda1 hda2 hda3 hda4
> hde: hde1 hde2 hde3 hde4 < hde5 hde6 hde7 hde8 hde9 hde10 >
> ide-floppy driver 0.99.newide
> [snipped]
> ---- dmesg: 2.5.65 ------------
> [snipped]
> ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
> PIIX4: IDE controller at PCI slot 00:07.1
> PIIX4: chipset revision 1
> PIIX4: not 100% native mode: will probe irqs later
> ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:pio, hdb:pio
> ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:pio, hdd:pio
> hda: WDC AC24300L, ATA DISK drive
> ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> hdc: TOSHIBA CD-ROM XM-6702B, ATAPI CD/DVD-ROM drive
> hdd: IOMEGA ZIP 100 ATAPI Floppy, ATAPI FLOPPY drive
> ide1 at 0x170-0x177,0x376 on irq 15
> SiI680: IDE controller at PCI slot 00:10.0
> PCI: Found IRQ 10 for device 00:10.0
> SiI680: chipset revision 2
> SiI680: not 100% native mode: will probe irqs later
> SiI680: BASE CLOCK == 133
> ide2: MMIO-DMA at 0xd4800000-0xd4800007, BIOS settings: hde:pio, hdf:pio
> ide3: MMIO-DMA at 0xd4800008-0xd480000f, BIOS settings: hdg:pio, hdh:pio
> hde: ST380021A, ATA DISK drive
> ide2 at 0xd4800080-0xd4800087,0xd480008a on irq 10
> hda: task_no_data_intr: status=0x51 { DriveReady SeekComplete Error }
> hda: task_no_data_intr: error=0x04 { DriveStatusError }
> hda: host protected area => 1
> hda: 8421840 sectors (4312 MB) w/256KiB Cache, CHS=8912/15/63, UDMA(33)
> hda: hda1 hda2 hda3 hda4
> hde: host protected area => 1
> hde: 156301488 sectors (80026 MB) w/2048KiB Cache, CHS=155061/16/63, UDMA(100)
> hde: hde1 hde2 hde3 hde4 < hde5 hde6 hde7 hde8 hde9 hde10 >
> end_request: I/O error, dev hdc, sector 0
> hdc: ATAPI 48X CD-ROM drive, 128kB Cache, UDMA(33)
> Uniform CD-ROM driver Revision: 3.12
> end_request: I/O error, dev hdc, sector 0
> ide-floppy driver 0.99.newide
> hdd: No disk in drive
> hdd: 98304kB, 96/64/32 CHS, 4096 kBps, 512 sector size, 2941 rpm
> [snipped]
> ---- hdparm /dev/hde: ---------------------
> /dev/hde:
> multcount = 16 (on)
> IO_support = 1 (32-bit)
> unmaskirq = 1 (on)
> using_dma = 1 (on)
> keepsettings = 0 (off)
> readonly = 0 (off)
> readahead = 16 (on)
> geometry = 23989/16/63, sectors = 156301488, start = 0
> ---- hdparm -I /dev/hde: -------------------
> ATA device, with non-removable media
> Model Number: ST380021A
> Serial Number: 3HV1CHVZ
> Firmware Revision: 3.75
> [snipped]
> Capabilities:
> LBA, IORDY(can be disabled)
> bytes avail on r/w long: 4 Queue depth: 1
> Standby timer values: spec'd by Standard
> R/W multiple sector transfer: Max = 16 Current = 16
> Recommended acoustic management value: 128, current value: 128
> DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 *udma4 udma5
> Cycle time: min=120ns recommended=120ns
> PIO: pio0 pio1 pio2 pio3 pio4
> Cycle time: no flow control=240ns IORDY flow control=120ns
> [snipped]
>

Andre Hedrick
LAD Storage Consulting Group

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