Re: [K3b-user] Reported speed inconsistency -> Q&A for DMA

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wow, this is a bit much I guess... I just implemented a check for dma so now 
k3b will warn the user in case dma is deactivated. But I will put this howtoo 
online anyway...

On Tuesday 25 April 2006 17:01, Edmund Laugasson wrote:
> > On Monday 24 April 2006 15:10, Philippe A. wrote:
> >> 2006/4/24, Dirk Schenkewitz <sch...@do...>:
> >>> On Saturday, 22. April 2006 17:30, Philippe A. wrote:
> >>>> 2006/4/21, Philippe A. <fut...@gm...>:
> >>>>> I am getting contradictory information from K3B when I am burning a
> >>>>> incremented every second. So it seems I'm really burning at 1X after
> >>>
> >>> all.
> >>>
> >>>> hdparm -d 1 /dev/hdc seems to have done the trick. I'm currently
> >>>> burning
> >>>
> >>> a
> >>>
> >>> No, thanks for bothering! 'hdparm -d 1 /dev/hdc' switches DMA on for
> >>> /dev/hdc - I always tend to forget it and wonder about the low speed,
> >>> then.
> >>
> >> Well let me add some more in that case :-) On Fedora Core 4 the default
> >> hdparms applied to my DVD drive are absolutely unacceptable. They cause
> >> K3B to burn at 1X and make video DVD playback pretty choppy. I scoured
> >> the net and found the "ideal" options to put in my /etc/rc.local:
> >>
> >> hdparm -c1 -d1 -u1 -a8 /dev/dvd
> >>
> >> I filed a bug report to RedHat asking for saner defaults. Let's hope for
> >> the best:
> >> https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=189723
> >>
> >> This hdparm information should definitely be included in the K3B FAQ
> >> BTW.
> >
> > true. Please write a question and the answer and I will include it.
>
> Q: How to make DVD/CD device faster?
>
> A: You need to enable DMA mode for optical storage devices, e.g. CD/DVD
> drive.
> The answer divides into multiple parts, each separated with appropriate
> title.
>
> I) you should know, what devices you may have.
> **********************************************
> 1) open terminal (ALT+F2 and write konsole in KDE or gnome-terminal in
> Gnome and press enter)
>
> 2) log in as root (su -). Using cat does not require root permissions
> but later using hdparm and setting device parameters, does.
>
> 3) type at terminal:
> cat /proc/sys/dev/cdrom/info
> ....and press enter. Now you can see, what devices you have and how they
> are marked (hdc, hdd, etc.). If you have multiple devices, e.g. DVD
> reader and CD writer, you may check, in which column are marked "Can
> read DVD" to "1". If there is marked "0", then this feature is not
> enabled, it means this is device is not able to read DVD-s. Other
> features are similarly marked.
>
> II) we should know, which IDE mode to choose.
> *****************************************************
> 1) Find the correct IDE mode for your device. Available IDE modes are as
> follows.
>
> In case there is PIO mode at your device, you should add 8 to get hdparm
> mode.
>
> The following table contains different available modes and data goes:
> mode name->hdparm mode->interface speed->standard name
>
> pio0 - X08 (3,3 Mbps) (ATA-1)
> pio1 - X09 (5,2 Mbps) (ATA-1)
> pio2 - X10 (8,3 Mbps) (ATA-1)
> pio3 - X11 (11,1 Mbps) (ATA-2)
> pio4 - X12 (16,6 Mbps) (ATA-2)
>
> mdma0 - X32 (4,2 Mbps) (ATA)
> mdma1 - X33 (13,3 Mbps) (ATA-2)
> mdma2 - X34 (16,6 Mbps) (ATA-3)
>
> udma0 - X64 (16,6 Mbps) (ATA-4)
> udma1 - X65 (25 Mbps) (ATA-4)
> udma2 - X66 (ATA-33) (ATA-4) (33,3 Mbps)
> udma3 - X67 (44,4 Mbps) (ATA-5)
> udma4 - X68 (ATA-66) (ATA-5) (66,6 Mbps)
> udma5 - X69 (ATA-100) (ATA-6) (100 Mbps)
> udma6 - X70 (ATA-133) (ATA-7) (133,3 Mbps)
>
> To get know, which mode your device can support, use one of the following:
>
> /sbin/hdparm -v -i /dev/hdd
> /sbin/hdparm -i /dev/hdd
> /sbin/hdparm -v -I /dev/hdd
> /sbin/hdparm -I /dev/hdd
>
> In this example there is device /dev/hdd used. Replace it with your
> device, that you got with cat /proc/sys/dev/cdrom/info
> Do this everywhere in this tutorial.
>
> For example
> ***********
>  a) type /sbin/hdparm -i /dev/hdc as root into terminal
>
> you may see the following:
>
> # /sbin/hdparm -i /dev/hdc
>
> /dev/hdc:
>
>  Model=TSSTcorpCD/DVDW TS-H552U, FwRev=US06, 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=yes, 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
>
>  b) as you probably understood - udma2 is the supported mode for this
> drive, because this mode is marked with * sign.
> NOTE! This is not current active mode as it shows! This is the maximum
> supported mode of this drive! If you turn off DMA - it still shows the
> same!
>
> III) Use the appropriate DMA mode on the desired device(s)
> **********************************************************
> Usage is shown also by man-pages: man hdparm
> ... and also at /usr/share/doc/packages/hdparm/ (e.g. in SuSE Linux).
>
> Usage:
> hdparm [parameters] [device]
>
> parameters
> ----------
> d1 - switch DMA mode on
> d0 - switch DMA mode off
>
>
> Examples:
> # /sbin/hdparm -d0 /dev/hdc
>
> /dev/hdc:
>  setting using_dma to 0 (off)
>  using_dma    =  0 (off)
>
> There are some more parameters you may use - please see man hdparm!
>
> hdparm modes
> ------------
> X00 - reset default settings
> X08...X70 - different hdparm modes (please see before-cited table of
> available hdparm modes)
>
> Examples:
>  a) hdparm -d1 -X66 /dev/hdd
> this will put on device /dev/hdd UDMA2 mode (which is mostly used at
> current CD/DVD-drives)
>
> # hdparm -d1 -X66 /dev/hdc
>
> /dev/hdc:
>  setting using_dma to 1 (on)
>  setting xfermode to 66 (UltraDMA mode2)
>  using_dma    =  1 (on)
>
>
> IV) Use the appropriate DMA mode at each start
> **********************************************
> You should add this line into startup script. Or make simple bash
> script, add executable byte (chmod a+x /script/name) and run it with
> your session manager. You may use /etc/sudoers to enable run DMA script
> with root permissions without asking root password, etc. - this sudo
> topic require more explanations.
>
> SuSE Linux uses /etc/init.d/boot.local - write e.g. the line hdparm -d1
> -X66 /dev/hdc there and each time you start your system, it sets the
> appropriate DMA mode on. In some Linux systems you should add also
> appropriate row (e.g. hdparm -d0 /dev/hdc) to shut down script.
>
> Slackware (/etc/init.d/rc.local to start), SuSE, Fedora, Mandriva - it's
> almost clear, how to add those lines into start or shut down scripts but
> in Debian (and also in Ubuntu) - I don't know. It would be nice, if
> there are for each distribution written down, to which script add to
> turn on and which script to turn off DMA mode.
> There is also the row:
> echo 1024 > /proc/sys/dev/rtc/max-user-freq
> ... which should be added into startup script (for MPlayer).
>
>
>
> Additional recourses:
> man hdparm
> /usr/share/doc/packages/hdparm/
> http://www.google.com/search?q=hdparm
> http://freshmeat.net/projects/hdparm/
> http://www.linuxnetmag.com/en/issue7/m7hdparm1.html
> http://bugclub.org/beginners/hardware/pio.html
> http://bugclub.org/beginners/hardware/DMA.html
> http://www.fact-index.com/a/ad/advanced_technology_attachment.html
> http://www.storagereview.com/guide2000/ref/hdd/if/ide/modesUDMA.html
>
>
> Best Regards,
> Edmund Laugasson
> Rapla, Estonia
>
>
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