[Bug 31709] Re: Brasero, GNOME's burn:/// and K3b slow dvd burn speed

[antsu]

I have recently upgraded to Jaunty (fresh install), and this slow DVD recording speeds problem also happens to me (for CDs it's fine). I have an LG GH22NP20 (that, afaik, can burn DVDs at 22x). When setting burning speed to 4x or 8x (it does not make diference), the maximum speed I can reach is from 1,2x to 2x. I checked the CD/DVD drives and HDs and everything is set to maximum UDMA, with no errors or warning messages. At burning process, CPU usage goes to 100%.
One curiosity is that, if I create a data DVD project from files on the HD and burn it on-the-fly, the problem ocurrs. If I burn from a pre-existent ISO file , the burn speed is normal. Also, if, instead of burning the project to the DVD recorder, I burn it to an ISO file, the process takes the same time of the slow recording.
So, I wonder if the issue is related to the ISO image creation process, because when writing to the DVD and this problem ocurrs, the software buffer (at K3Bs burning status window) stays between 1% and 5%. It looks like the process that reads the data from HD and outputs it in the ISO format cannot "feed" the recorder's buffer at suficient speed.

Here, the outputs of the test commands in my machine:

me at myhost:~$ dmesg | grep DMA
[    0.000000]   DMA      0x00000010 -> 0x00001000
[    0.000000]   DMA zone: 32 pages used for memmap
[    0.000000]   DMA zone: 0 pages reserved
[    0.000000]   DMA zone: 3951 pages, LIFO batch:0
[    1.930073] ata1: PATA max UDMA/133 cmd 0x1f0 ctl 0x3f6 bmdma 0xfc00 irq 14
[    1.930078] ata2: PATA max UDMA/133 cmd 0x170 ctl 0x376 bmdma 0xfc08 irq 15
[    2.100599] ata1.00: ATA-7: Maxtor 6K040L0, NAR61HA0, max UDMA/133
[    2.102223] ata1.01: ATA-7: Maxtor 6L080L0, BAJ41G20, max UDMA/133
[    2.116463] ata1.00: configured for UDMA/133
[    2.133846] ata1.01: configured for UDMA/133
[    2.544448] ata2.00: ATAPI: HL-DT-STDVD-RAM GH22NP20, 1.03, max UDMA/66
[    2.544507] ata2.01: ATAPI: SONY    CD-RW  CRX230EE, 2YS8, max UDMA/33
[    2.560361] ata2.00: configured for UDMA/66
[    2.592298] ata2.01: configured for UDMA/33
[   10.727208] parport0: PC-style at 0x378 (0x778), irq 7, dma 3 [PCSPP,TRISTATE,COMPAT,ECP,DMA]

me at myhost:~$ hdparm -i /dev/sr0

/dev/sr0:

 Model=HL-DT-STDVD-RAM GH22NP20                , FwRev=1.03    , 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:120,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4 
 DMA modes:  sdma0 sdma1 sdma2 mdma0 mdma1 mdma2 
 UDMA modes: udma0 udma1 udma2 udma3 *udma4 
 AdvancedPM=no
 Drive conforms to: Unspecified:  ATA/ATAPI-3,4,5,6

 * signifies the current active mode


ps: sorry if I was not suficiently clear, my English skills are not too good...

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Brasero, GNOME's burn:/// and K3b slow dvd burn speed
https://bugs.launchpad.net/bugs/31709
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