Re: Abysmal PATA IDE performance

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Arjan van de Ven wrote:



Thanks all.

Arjan, using combined_mode=libata and making a new ramdisk increased my xfer rate from 1.xx mb/sec to 28.xx mb/sec.


ok that's getting somewhere

I am curious as to why my friends dell inspiron 8200 with a 1.8ghz p4 and the same drive using the same drive with FC6 and the standard ide module gets 44 to 45 mb/sec.

now it is going to come down to how you measure this....

don't use hdparm, use something like tiobench (tiobench.sf.net);
another setting that might be different is that scsi normally turns the
write back cache off (safer for your data but slower) while IDE normally
leaves at at factory default (on for cheating on benchmarks).
For writes, this can easily explain the difference...


Looking at the dmesg output I am a little confused, see comments below:
partial dmesg output follows:

SCSI subsystem initialized
libata version 2.00 loaded.
ata_piix 0000:00:1f.2: version 2.00
ata_piix 0000:00:1f.2: MAP [ P0 P2 IDE IDE ]
ACPI: PCI Interrupt 0000:00:1f.2[B] -> GSI 19 (level, low) -> IRQ 233
PCI: Setting latency timer of device 0000:00:1f.2 to 64
ata1: SATA max UDMA/133 cmd 0x1F0 ctl 0x3F6 bmdma 0xFFA0 irq 14
scsi0 : ata_piix
Synaptics Touchpad, model: 1, fw: 6.1, id: 0xa3a0b3, caps: 0xa04713/0x10008
input: SynPS/2 Synaptics TouchPad as /class/input/input1
ATA: abnormal status 0x7F on port 0x1F7
ata2: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0xFFA8 irq 15
scsi1 : ata_piix
ata2.00: ATA-6, max UDMA/100, 117210240 sectors: LBA48
ata2.00: ata2: dev 0 multi count 16
usb 2-2: new low speed USB device using uhci_hcd and address 3
ata2.01: ATAPI, max UDMA/33
ata2.00: configured for UDMA/33 <==== why isn't this 66 or 100 ? ===============****
usb 2-2: configuration #1 chosen from 1 choice
input: Logitech USB-PS/2 Trackball as /class/input/input2
input: USB HID v1.00 Mouse [Logitech USB-PS/2 Trackball] on usb-0000:00:1d.1-2 ata2.01: configured for UDMA/33 <=========== is this related to the following 2 lines? ====
 Vendor: ATA       Model: HTS721060G9AT00   Rev: MC3O
 Type:   Direct-Access                      ANSI SCSI revision: 05
SCSI device sda: 117210240 512-byte hdwr sectors (60012 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: drive cache: write back
SCSI device sda: 117210240 512-byte hdwr sectors (60012 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: drive cache: write back
sda: sda1 sda2
sd 1:0:0:0: Attached scsi disk sda
 Vendor: HL-DT-ST  Model: DVDRAM GMA-4082N  Rev: HJ02
 Type:   CD-ROM                             ANSI SCSI revision: 05
device-mapper: ioctl: 4.7.0-ioctl (2006-06-24) initialised: [email protected]
kjournald starting.  Commit interval 5 seconds

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