2004-10-26 21:50:44

by J.A. Magallon

Subject: Setting 32bit IO on SATA drives

Hi all...

I have a bunch of SATA drives on a RAID-5 setup.
I was investigating the usual things on ide disks to optimize performance,
with hdparm.

The defalt settings, as they boot:

sata_promise version 1.00
ACPI: PCI interrupt 0000:00:07.0[A] -> GSI 17 (level, low) -> IRQ 177
ata1: SATA max UDMA/133 cmd 0xF0802200 ctl 0xF0802238 bmdma 0x0 irq 177
...
ata1: dev 0 cfg 49:2f00 82:7c6b 83:7f09 84:4003 85:7c69 86:3e01 87:4003 88:407f
ata1: dev 0 ATA, max UDMA/133, 490234752 sectors: lba48
ata1: dev 0 configured for UDMA/133

nada:~# lsscsi -l
[0:0:0:0] disk ATA Maxtor 7Y250M0 YAR5 /dev/sda
state=running queue_depth=1 scsi_level=6 type=0 device_blocked=0 timeout=30

nada:~# hdparm /dev/sda

/dev/sda:
HDIO_GET_MULTCOUNT failed: Operation not supported
IO_support = 0 (default 16-bit)
readonly = 0 (off)
readahead = 256 (on)
geometry = 30515/255/63, sectors = 251000193024, start = 0

nada:~# hdparm -c /dev/sda

/dev/sda:
IO_support = 0 (default 16-bit)

nada:~# hdparm -c1 /dev/sda

/dev/sda:
setting 32-bit IO_support flag to 1
HDIO_SET_32BIT failed: Invalid argument
IO_support = 0 (default 16-bit)

How can I make 32bit IO active ?

TIA

--
J.A. Magallon <jamagallon()able!es> \ Software is like sex:
werewolf!able!es \ It's better when it's free
Mandrakelinux release 10.1 (Community) for i586
Linux 2.6.9-jam1 (gcc 3.4.1 (Mandrakelinux 10.1 3.4.1-4mdk)) #4

2004-10-26 23:01:59

by Jeff Garzik

Subject: Re: Setting 32bit IO on SATA drives

J.A. Magallon wrote:
> How can I make 32bit IO active ?


32bit isn't relevant if you are using DMA.

libata is hardcoded to use 16bit PIO data transfers.

Jeff

2004-10-27 02:19:11

by Mark Lord

Subject: Re: Setting 32bit IO on SATA drives

> HDIO_GET_MULTCOUNT failed: Operation not supported

Fyi, I have removed that bogus error message from my
working copy of hdparm.

Cheers
--
Mark Lord
(hdparm keeper & the original "Linux IDE Guy")

2004-10-27 20:20:05

by Bill Davidsen

Subject: Re: Setting 32bit IO on SATA drives

Mark Lord wrote:
> > HDIO_GET_MULTCOUNT failed: Operation not supported
>
> Fyi, I have removed that bogus error message from my
> working copy of hdparm.

I thought it wasn't supported. I presume you mean you detected that the
operation should not be attempted rather than causing an error to fail
silently.

--
-bill davidsen ([email protected])
"The secret to procrastination is to put things off until the
last possible moment - but no longer" -me