iB::Topic::dma and Intel PIIX (Triton) chipset

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Topic: dma and Intel PIIX (Triton) chipset, how to enable dma with Intel PIIX

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holter

Group: Members
Posts: 3
Joined: Feb. 2006

Posted: Feb. 24 2006,11:34

Hi folks,
I have installed DLS2.0 on an old Pentium Pro box.
All is ok, only dma for my hard drive can not be enabled.

Code Sample

root@0[root]# hdparm -d1 /dev/hda
/dev/hda:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma = 0 (off)

I guess the chipset/hd combination should be capable of doing dma
but somehow it can not be enabled.

lspci says:

Code Sample

0000:00:00.0 Host bridge: Intel Corp. 430FX - 82437FX TSC [Triton I] (rev 01)
0000:00:07.0 ISA bridge: Intel Corp. 82371FB PIIX ISA [Triton I] (rev 02)
0000:00:0d.0 VGA compatible controller: ATI Technologies Inc 3D Rage IIC 215IIC [Mach64 GT IIC] (rev 7a)
0000:00:0e.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)

hdparm -i says:

Code Sample

/dev/hda:

Model=SAMSUNG SP2514N, FwRev=VF100-33, SerialNo=S08BJ1NA164822
Config={ Fixed }
RawCHS=16383/16/63, TrkSize=34902, SectSize=554, ECCbytes=4
BuffType=DualPortCache, BuffSize=8192kB, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=268435455
IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 *mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5
AdvancedPM=no WriteCache=enabled
Drive conforms to: unknown:

* signifies the current active mode

I guess the relevant part from dmesg ist

Code Sample

RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
Uniform Multi-Platform E-IDE driver Revision: 7.00beta4-2.4
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
PIIXa: IDE controller at PCI slot 00:07.0
PIIXa: chipset revision 2
PIIXa: not 100% native mode: will probe irqs later
PIIXa: neither IDE port enabled (BIOS)
hda: SAMSUNG SP2514N, ATA DISK drive
hdc: SAMSUNG DVD-ROM SD-616T, ATAPI CD/DVD-ROM drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
hda: attached ide-disk driver.
hda: host protected area => 1
hda: 488397168 sectors (250059 MB) w/8192KiB Cache, CHS=30401/255/63
Partition check:
hda: hda1 hda2 hda3
ide: late registration of driver.

Am I missing any modules?

If anyone could give me anypointers what to do here, that would be great.

Thanks for your help

starcannon Offline

Group: Members
Posts: 100
Joined: Oct. 2005

Posted: Feb. 24 2006,17:07

Try this thread,
turning on DMA
Not sure if that willwork for your specific hardware or not, but its a place to start. Good Luck and hope it works

Rob

--------------
Damn Small Linux... Because size DOES matter...
Viva Le' Revolution!

holter

Group: Members
Posts: 3
Joined: Feb. 2006

Posted: Feb. 24 2006,18:01

Thanks Rob,
but that thread only explains how to turn on dma in general. What I need to know is, why I get this error

Quote

HDIO_SET_DMA failed: Operation not permitted

And how to avoid it.

cbagger01

Group: Members
Posts: 4264
Joined: Oct. 2003

Posted: Feb. 25 2006,06:35

You probably have an old buggy IDE controller chip that does not support DMA properly.

I have a Pentium-I system and I cannot turn DMA on for this reason.

If so, you may see some messages elsewhere in your dmesg output to this effect. You also might even see an:

hda: Lost Interrupt

message in a terminal window every now and then during disk access.

holter

Group: Members
Posts: 3
Joined: Feb. 2006

Posted: Feb. 27 2006,12:01

What I, hav done now:
I´ve install a PCI-IDE controller. Now I am able to turn on DMA
still I am quite slow. But for normal use as NAS it is sufficient:

Quote

root@1[root]# hdparm -t /dev/hda
/dev/hda:
Timing buffered disk reads: 26 MB in 3.11 seconds = 8.36 MB/sec

Thanks all

5 replies since Feb. 24 2006,11:34

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