dma on as default

[Paul Smith]

On 8/28/06, François Patte <francois.patte at math-info.univ-paris5.fr> wrote:
> >> >> > Is there some way to  make permanent/default the change operated by
> >> >> > '/sbin/hdparm -d1 /dev/dvd', i.e., choosing dma on as default?
> >> >> >
> >> >> the best setting is very often selected automatically ... what version
> >> >> of fedora are u using?
> >> >>
> >> >> do hdparm -i /dev/hdx ... and have a look at the dma modes ... the
> >> >> current mode is indicated by a *
> >> >>
> >> >> u only need to use hdparm if that highest dma mode is not the current
> >> >> setting
> >> >
> >> > Thanks, Brian. I am using FC5. And
> >> >
> >> > # /sbin/hdparm -i /dev/dvd
> >> >
> >> > /dev/dvd:
> >> >
> >> > Model=_NEC DVD_RW ND-3520A, FwRev=1.04, SerialNo=
> >> > Config={ Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic }
> >> > RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0
> >> > BuffType=unknown, BuffSize=0kB, MaxMultSect=0
> >> > (maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0
> >> > IORDY=yes, tPIO={min:120,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
> >> > AdvancedPM=no
> >> >
> >> > * signifies the current active mode
> >> >
> >> > #
> >> >
> >> > And now?
> >> >
> >> hmmm......i have never seen hdparm not return a current mode ...
> >> intriguing.
> >>
> >> anyway ... the permanent way to save the changes is to put a command in
> >> your /etc/rc.d/rc.local file
> >>
> >> edit that file and at the end of the file put in "/sbin/hdparm /dev/hdx
> >> -your-parameters"
> >>
> >> from the output of hdparm i would try "/sbin/hdparm /dev/hdx -d1 -m32 -X
> >> udma2" where hdx is like hdc or hdd .. whichever device /dev/dvd is
> >> linked to. i suppose using a symbolic link (dvd) to the real drive is ok
> >> ... but i like to directly address the device
> >>
> >> that is the highest performance the drive will support ... what it means
> >> is ... use dma, and use 32 bit access, and use udma2 dma mode. If the
> >> drive does not perform properly with that setting, progressivley try
> >> less aggressive settings....eg. -X udma1, -X udma0, -X mdma2, ... etc
> >>
> >> you are using a recent motherboard chipset, so i doubt you will need to
> >> reduce the settings from what i have suggested .. though i must say i am
> >> perplexed that hdparm has not indicated a current mode ...
> >
> >
> > Put the line
> >
> > /sbin/hdparm /dev/hdf -d1 -m32 -X udma2
> >
> > in /etc/rc.d/rc.local, and then
> >
> > the line
> >
> > /sbin/hdparm /dev/hdf -d1
> >
> > but after a reboot, in both cases, I get
> >
> > # /sbin/hdparm /dev/dvd
> >
> > /dev/dvd:
> > IO_support   =  0 (default 16-bit)
> >  unmaskirq    =  1 (on)
> > using_dma    =  0 (off)
> >  keepsettings =  0 (off)
> >  readonly     =  0 (off)
> >  readahead    = 256 (on)
> > HDIO_GETGEO failed: Inappropriate ioctl for device
> > #
>
> What is exactly your problem? Do you have SATA HD? Is it a laptop?

Thanks, François. The problem is that if I do not set dma on, my dvd
burner works _extremly_ slow. I do not have any SATA HD and it is not
a laptop.

Paul