dma on as default

[Brian Chadwick]

Paul Smith wrote:
> 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
>
how many drives do you have in this system?

how old is the burner

what is your motherboard

are you using a plugin card to drive the burner