On Wednesday 2007-05-02 00:16:37 dragoran dragoran wrote:
> On 5/1/07, Doncho N. Gunchev <gunchev@xxxxxxxxx> wrote:
> > On Tuesday 2007-05-01 23:21:53 dragoran dragoran wrote:
> > > On 5/1/07, Doncho N. Gunchev <gunchev@xxxxxxxxx> wrote:
> > > > On Tuesday 2007-05-01 21:52:04 you wrote:
> > > > > I installed F7t4 from the KDE live CD, my hardware profile is:
> > > > > ebf36068-3809-426c-ade0-d0c531b5b402. Here are the results:
...
> > > > OT: Now, when hdparm -d 0/1 does nothing, how can I switch DMA on/off
> >
> > for
> >
> > > > my
> > > > DVD-Writer and hard disk?
> > >
> > > there is no reason to turn it off the new driver should select and set
> >
> > the
> >
> > > best dma mode that your drive/chipset supports; if not its a bug.
> >
> > I know it should (remember when these settings got removed from
> > /etc/sysconfig/*?), that's why I asked 'how?'. My DVD-Writer seems
> > to not use any DMA at all (~1MB/sec vs >4MB/sec in FC6). How do
> > I know if it uses "the best mode", if I can't try any other?
>
> its simple a higher dma mode means higher speed.
> what does hdparm -i /dev/yourdevice show?
> (both fc6 and f7 output) ?
>
What was not clear in my question, I asked how do I do turn DMA on/off with
the new kernels, not why I should not do this? Is there a reason to keep this
secret?
Here's the info for my DVD-Writer, it has DMA off in FC6 and I'm turning it on
in rc.local to get it working faster. I also have to 'killall
hald-addon-storage' (or more specificly, the one that monitors my DVD) or the
machine (laptop) will die in a few hours (does not matter if I have DMA on,
off or if I try to play with /usr/share/hal/fdi/policy/10osvendor/*.fdi.
Haven't seen it locking for this reason with F7t4 yet.
--- Fedora Core 6 ---
# hdparm -i /dev/hdb
/dev/hdb:
Model=TSSTcorpCD/DVDW TS-L632D, FwRev=AC01, SerialNo=
Config={ Fixed 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=on/off, tPIO={min:227,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
# hdparm /dev/hdb
/dev/hdb:
IO_support = 0 (default 16-bit)
unmaskirq = 0 (off)
using_dma = 0 (off)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
HDIO_GETGEO failed: Inappropriate ioctl for device
*** There is a difference when hdparm /dev/hdb shows DMA on - when I watch DVD
movie it works (and the time taken by the kernel while reading the DVD drops
down), when off - it skips frames and looses a/v sync.
--- Fedora 7 test 4 ---
# ll /dev/dvdrw
lrwxrwxrwx 1 root root 4 2 май 0,56 /dev/dvdrw -> scd0
# hdparm -i /dev/scd0
/dev/scd0:
Model=TSSTcorpCD/DVDW TS-L632D , FwRev=AC01 , SerialNo=
Config={ Fixed 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=on/off, tPIO={min:227,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
# hdparm /dev/scd0
/dev/scd0:
IO_support = 0 (default 16-bit)
readonly = 0 (off)
readahead = 256 (on)
HDIO_GETGEO failed: Inappropriate ioctl for device
--
Regards,
Doncho
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