On 8/17/05, Pupeno <[EMAIL PROTECTED]> wrote:
> On Wednesday 17 August 2005 22:15, Mark Knecht wrote:
> > On 8/17/05, Pupeno <[EMAIL PROTECTED]> wrote:
> > > On Wednesday 17 August 2005 18:44, Mark Knecht wrote:
> > > > A quick test would be
> > > >
> > > > hdparm -tT /dev/hda
> > >
> > > I got this:
> > > /dev/hda:
> > > Timing cached reads: 1344 MB in 2.00 seconds = 672.10 MB/sec
> > > Timing buffered disk reads: 8 MB in 3.51 seconds = 2.28 MB/sec
> > >
> > > > (or whatever drive you are concerned about.) Greater than 15MB/S is
> > > > almost certainly DMA but good DMA from newer drives should be
> > > > 25-50MB/S
> > >
> > > The second speed is evidently wrong.
> >
> > Not wrong, just not DMA.
> Should I leave DMA off ? Isn't almost always faster to use DMA ?
>
> > > > You can look at the drives parameters using hdparm and reading through
> > > > the man page to understand what all the values mean.
> > >
> > > I tried to enable dma, but this happened:
> > > # hdparm -d1 /dev/hda
> > >
> > > /dev/hda:
> > > setting using_dma to 1 (on)
> > > HDIO_SET_DMA failed: Operation not permitted
> > > using_dma = 0 (off)
> > >
> > > What am I doing wrong ? some kernel option ?
> >
> > Possibly. Many of the ATAPI DMA drivers are supplied when you enable
> > the proper chipset support in make menuconfig under Device Drivers ->
> > ATA support.
> I have all of them enabled as modules.
>
> > What chipset is your machine using? (lspci)
> 0000:00:1f.1 IDE interface: Intel Corporation 82801DBM (ICH4-M) IDE Controller
> (rev 01)
>
> > From my laptop:
> >
> > flash linux # hdparm /dev/hda
> >
> > /dev/hda:
> > multcount = 16 (on)
> > IO_support = 0 (default 16-bit)
> > unmaskirq = 0 (off)
> > using_dma = 1 (on)
> Here, your dma is on! :)
>
> > keepsettings = 0 (off)
> > readonly = 0 (off)
> > readahead = 256 (on)
> > geometry = 65535/16/63, sectors = 80026361856, start = 0
> > flash linux #
> >
> > flash linux # hdparm -tT /dev/hda
> >
> > /dev/hda:
> > Timing cached reads: 1788 MB in 2.00 seconds = 891.91 MB/sec
> > Timing buffered disk reads: 82 MB in 3.04 seconds = 26.93 MB/sec
> > flash linux #
>
> Thanks.
> --
> Pupeno <[EMAIL PROTECTED]> (http://pupeno.com)
> Reading ? Science Fiction ? http://sfreaders.com.ar
>
>
>
I'm sorry if this copy/paste gets messy. I'm attempting to show you
all the stuff I have enabled on a Via desktop machine:
<*> ATA/ATAPI/MFM/RLL support │ │
│ │ <*> Enhanced IDE/MFM/RLL disk/cdrom/tape/floppy support
│ │
│ │ --- Please see Documentation/ide.txt for help/info on IDE
drives │ │
│ │ [ ] Support for SATA (deprecated; conflicts with libata
SATA driver) │ │
│ │ [ ] Use old disk-only driver on primary interface
│ │
│ │ <*> Include IDE/ATA-2 DISK support
│ │
│ │ [*] Use multi-mode by default
│ │
│ │ <*> Include IDE/ATAPI CDROM support
│ │
│ │ < > Include IDE/ATAPI TAPE support (EXPERIMENTAL)
│ │
│ │ < > Include IDE/ATAPI FLOPPY support
│ │
│ │ < > SCSI emulation support
│ │
│ │ [ ] IDE Taskfile Access
│ │
│ │ --- IDE chipset support/bugfixes
│ │
│ │ <*> generic/default IDE chipset support
│ │
│ │ [*] CMD640 chipset bugfix/support
│ │
│ │ [ ] CMD640 enhanced support
│ │
│ │ [ ] PNP EIDE support
│ │
│ │ [*] PCI IDE chipset support
│ │
│ │ [*] Sharing PCI IDE interrupts support
│ │
│ │ [ ] Boot off-board chipsets first support
│ │
│ │ <*> Generic PCI IDE Chipset Support
│ │
│ │ < > OPTi 82C621 chipset enhanced support (EXPERIMENTAL)
│ │
│ │ <*> RZ1000 chipset bugfix/support
│ │
│ │ [*] Generic PCI bus-master DMA support
│ │
│ │ [ ] Force enable legacy 2.0.X HOSTS to use DMA
│ │
│ │ [*] Use PCI DMA by default when available
[ ] Enable DMA only for disks
│ │
│ │ < > AEC62XX chipset support
│ │
│ │ < > ALI M15x3 chipset support
│ │
│ │ < > AMD and nVidia IDE support
│ │
│ │ < > ATI IXP chipset IDE support
│ │
│ │ < > CMD64{3|6|8|9} chipset support
│ │
│ │ < > Compaq Triflex IDE support
│ │
│ │ < > CY82C693 chipset support
│ │
│ │ < > Cyrix CS5510/20 MediaGX chipset support (VERY
EXPERIMENTAL) │ │
│ │ < > Cyrix/National Semiconductor CS5530 MediaGX chipset
support │ │
│ │ < > HPT34X chipset support
│ │
│ │ < > HPT36X/37X chipset support
│ │
│ │ < > National SCx200 chipset support
│ │
│ │ < > Intel PIIXn chipsets support
│ │
│ │ < > IT821X IDE support
│ │
│ │ < > NS87415 chipset support
│ │
│ │ < > PROMISE PDC202{46|62|65|67} support
│ │
│ │ < > PROMISE PDC202{68|69|70|71|75|76|77} support
│ │
│ │ < > ServerWorks OSB4/CSB5/CSB6 chipsets support
│ │
│ │ < > Silicon Image chipset support
│ │
│ │ < > SiS5513 chipset support
│ │
│ │ < > SLC90E66 chipset support
│ │
│ │ < > Tekram TRM290 chipset support
│ │
│ │ <*> VIA82CXXX chipset support
│ │
│ │ [ ] Other IDE chipset support
│ │
│ │ [ ] IGNORE word93 Validation BITS
I think the important ones are probably:
<*> ATA/ATAPI/MFM/RLL support │ │
│ │ <*> Enhanced IDE/MFM/RLL disk/cdrom/tape/floppy support
│ │
│ │ [*] Use multi-mode by default
│ │
│ │ <*> generic/default IDE chipset support
│ │
│ │ [*] PCI IDE chipset support
│ │
│ │ [*] Sharing PCI IDE interrupts support
│ │
│ │ <*> Generic PCI IDE Chipset Support
│ │
│ │ [*] Use PCI DMA by default when available
and for you probably:
│ │ < > Intel PIIXn chipsets support
│ │
Hope this helps,
Mark
--
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