Extremely slow burning in K3B

Renaud Vernet renaud.vernet at cern.ch
Sat Aug 20 18:35:25 UTC 2005


Jim McQuiston wrote:
> Renaud Vernet wrote:
> 
> 
>>Jim McQuiston wrote:
>>
> 
> 
>>First let me apologize for the lengthy post, however I thought it
>>better to supply more information than not enough.  I am having great
>>difficulties in getting K3B to burn at speeds greater than 4X despite
>>have a burner capable of 48X. I have endeavored to read up on the
>>issues surrounding poor burning speeds and believe that I have tackled
>>issues surrounding enabling DMA and setting the SUID bit on CDRECORD.
>>However, I am getting nowhere and request the sage advice of
>>Ubuntu/Kubuntu users. Hopefully, I have provided comprehensive
>>diagnostic information below:
>>
>>root at virgil:/home # uname -a
>>Linux virgil 2.6.10-5-amd64-generic #1 Fri Jun 24 16:54:18 UTC 2005
>>x86_64 GNU/Linux
>>
>>root at virgil:/home # cdrecord -checkdrive
>>Cdrecord-Clone 2.01a38 (x86_64-unknown-linux-gnu) Copyright (C)
>>1995-2004 Joerg Schilling
>>NOTE: this version of cdrecord is an unofficial (modified) release of
>>cdrecord
>>      and thus may have bugs that are not present in the original version.
>>      Please send bug reports and support requests to
>><cdrtools at packages.debian.org>.
>>      The original author should not be bothered with problems of this
>>version.
>>
>>cdrecord: Warning: Running on Linux-2.6.10-5-amd64-generic
>>cdrecord: There are unsettled issues with Linux-2.5 and newer.
>>cdrecord: If you have unexpected problems, please try Linux-2.4 or
>>Solaris.
>>scsidev: '1,5,0'
>>scsibus: 1 target: 5 lun: 0
>>cdrecord: No such file or directory. Cannot open '/dev/sg*'. Cannot
>>open SCSI driver.
>>cdrecord: For possible targets try 'cdrecord -scanbus'.
>>cdrecord: For possible transport specifiers try 'cdrecord dev=help'.
>>cdrecord:
>>cdrecord: For more information, install the cdrtools-doc
>>cdrecord: package and read /usr/share/doc/cdrecord/README.ATAPI.setup .
>>
>>root at virgil:/home # hdparm -I /dev/hdc
>>
>>/dev/hdc:
>>
>>ATAPI CD-ROM, with removable media
>>        Model Number:       LITE-ON LTR-48246S
>>        Serial Number:
>>        Firmware Revision:  SS09
>>Standards:
>>        Used: ATAPI for CD-ROMs, SFF-8020i, r2.5
>>        Supported: CD-ROM ATAPI-2
>>Configuration:
>>        DRQ response: 50us.
>>        Packet size: 12 bytes
>>Capabilities:
>>        LBA, IORDY(cannot be disabled)
>>        DMA: mdma0 mdma1 mdma2 udma0 udma1 *udma2
>>             Cycle time: min=120ns recommended=120ns
>>        PIO: pio0 pio1 pio2 pio3 pio4
>>             Cycle time: no flow control=227ns  IORDY flow control=120ns
>>
>>root at virgil:/home # chmod u+s /usr/bin/cdrecord.*
>>root at virgil:/home #                         
>>from /etc/hdparm
>>
>>#/dev/discs/disc0/disc {
>>#    mult_sect_io = 16
>>#    write_cache = off
>>#    spindown_time = 240
>>#}
>>
>>#/dev/discs/disc1/disc {
>>#    mult_sect_io = 32
>>#    spindown_time = 36
>>#    write_cache = off
>>#}
>>
>>#/dev/cdroms/cdrom0 {
>>#    dma = on           #    interrupt_unmask = on
>>#    io32_support = 0
>>#}
>>
>>#/dev/hda {
>>#    mult_sect_io = 16
>>#    write_cache = off
>>#    dma = on
>>#}
>>
>>#command_line {
>>#       hdparm -q -m16 -q -W0 -q -d1 /dev/hda
>>#}
>>/dev/hdc {
>>
>>    dma = on
>>    interrupt_unmask = on
>>    io32_support = 1
>>
>>}
>>/dev/hdd {
>>
>>    dma = on
>>    interrupt_unmask = on
>>    io32_support = 1
>>
>>}
>>
>># Addition by kudos unofficial kubuntu faq
>>command_line {
>>    hdparm -c3 -d1 -m16 /dev/[hs]d?
>>}
>>
>>Again, my apologies for the lengthy post.  Thank you, in advance, for
>>your time and assistance.
>>
>>
>>--
>> Jim McQuiston
>> 
>>Registered Linux User #375957
>> "For every moment of triumph, for every instance of beauty, many
>>souls must be trampeled." -- Hunter S.Thompson
> 
> 
>>>
>>You ask for dma in you /etc/hdparm, but are you sure dma is indeed
> 
> enabled ?
> 
>>Did you try to see what gives, typing in a terminal, "hdparm -d1
> 
> /dev/hdc" ?
> 
> Here are the results:
> 
> root at virgil:/home # hdparm -d1 /dev/hdc
> 
> /dev/hdc:
>  setting using_dma to 1 (on)
>  using_dma    =  1 (on)
> 
> I cannot tell from this message whether DMA was off and I set it to on,
> or merely that it is reporting that it is on to start with.  This
> command, by itself, does not appear to help my problem. Burning is still
> extremely slow.
> 
> Willing to try anything at this point.
> 

Ok, you manage to set dma "on", and I am not good enough to give an 
explanation why it is slow.

But are you sure may burn dvd's at 48X speed ? it sound HUGE to me... 
isn't it CD burning speed ?
4X is not that bad !!






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