DMA issues with FC4 on a Dell precision M70

[Alessandro Brezzi]

2006/2/18, Alfredo Ferrari <list at pceet030.cern.ch>:
>
> Hi
>
> I have a Dell Precision M70 whose primary hard disk is a SATA disk
> (/dev/sda) running FC4 (kernel 2.6.15-1.1831_FC4).
> The secondary hard disk is a PATA one (/dev/hdc, in the laptop modular
> bay) and apparently I cannot get DMA enabled on it, resulting in very poor
> performances (2.5 MB/s against 25 MB/s for the same disk in the modular
> bay of a PATA only Dell D800 where it runs happily with DMA enabled).
>
> If I try to enable DMA by hand I get:
>
> [root at pcalfr ~]# hdparm -d1 /dev/hdc
>
> /dev/hdc:
>   setting using_dma to 1 (on)
>   HDIO_SET_DMA failed: Operation not permitted
>   using_dma    =  0 (off)
>
> Every help/suggestion is greatly appreciated
>
>               Alfredo Ferrari
>
> P.S. The only messages of some relevance I can see at boot (from dmesg)
> are:
>
>    DMA zone: 4096 pages, LIFO batch:0
>    DMA32 zone: 0 pages, LIFO batch:0
>    Normal zone: 225280 pages, LIFO batch:31
>    HighMem zone: 294872 pages, LIFO batch:31
>
> ...
>
> PCI: Ignoring BAR0-3 of IDE controller 0000:00:1f.2
>
> ...
>
> Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
> ide: Assuming 33MHz system bus speed for PIO modes; override with
> idebus=xx
> ide0: I/O resource 0x1F0-0x1F7 not free.
> ide0: ports already in use, skipping probe
> Probing IDE interface ide1...
> hdc: ST94811A, ATA DISK drive
> ide1 at 0x170-0x177,0x376 on irq 15
> hdc: max request size: 1024KiB
> hdc: 78140160 sectors (40007 MB) w/8192KiB Cache, CHS=16383/255/63
> hdc: cache flushes supported
>   hdc: hdc1 hdc2 hdc3 < hdc5 hdc6 hdc7 hdc8 >
> ide-floppy driver 0.99.newide
>
> ...
>
> SCSI subsystem initialized
> libata version 1.20 loaded.
> ata_piix 0000:00:1f.2: version 1.05
> ACPI: PCI Interrupt 0000:00:1f.2[B] -> Link [LNKB] -> GSI 5 (level, low)
> -> IRQ 5
> ata: 0x170 IDE port busy
> PCI: Setting latency timer of device 0000:00:1f.2 to 64
> ata1: SATA max UDMA/133 cmd 0x1F0 ctl 0x3F6 bmdma 0xBFA0 irq 14
> ata1: dev 0 cfg 49:0f00 82:746b 83:7fe9 84:4023 85:7469 86:3e49 87:4023
> 88:203f
> ata1: dev 0 ATA-6, max UDMA/100, 195371568 sectors: LBA48
> ata1(0): applying bridge limits
> ata1: dev 0 configured for UDMA/100
> scsi0 : ata_piix
>    Vendor: ATA       Model: Hitachi HTS72101  Rev: MCZO
>    Type:   Direct-Access                      ANSI SCSI revision: 05
> SCSI device sda: 195371568 512-byte hdwr sectors (100030 MB)
> SCSI device sda: drive cache: write back
> SCSI device sda: 195371568 512-byte hdwr sectors (100030 MB)
> SCSI device sda: drive cache: write back
>   sda: sda1 sda2 sda3 sda4 < sda5 sda6 sda7<6>input: PS/2 Mouse as
> /class/input/input1
>   sda8 sda9 >
> sd 0:0:0:0: Attached scsi disk sda
> input: AlpsPS/2 ALPS GlidePoint as /class/input/input2
> kjournald starting.  Commit interval 600 seconds



Hi Alfredo,
is your PATA disk  attached to the secondary IDE channel? Not sure about
laptop arch, but in desktop box primary and secondary IDE interface work
different.
HTH

--
Alessandro Brezzi
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