Re: Very slow CD burning
On Sun, 2003-09-28 at 16:42, Pigeon wrote:
> > I've tried running it with cdrecord.mmap suid root and as root but it's
> > still just as slow. Could it be related to me not being able to set dma
> > on any of my drives? How does that affect scsi emulated drives?
>
> (I'm CCing you, since you CCed me...)
>
> Since your original post there have been a couple of others that have
> elucidated that the latest cdrecord has a bug which causes it to throw
> out an error message when trying to _reduce_ its privileges (such as
> in your posted output). In the past these error messages have been a
> good indication that the cdrecord binary isn't running as root, which
> seems to have thrown me off track.
>
> Not being able to set DMA might well be connected. SCSI-emulated
> drives are still on the IDE bus as far as the hardware is concerned,
> so they are affected by IDE DMA settings. Also, if the hard drive is
> not using DMA, it will be a slow business getting the data to send to
> the CD-RW in the furst place. Do you have DMA enabled in your kernel?
> My kernel config (2.4.21) has:
>
> CONFIG_BLK_DEV_IDEDMA_PCI=y
> CONFIG_IDEDMA_PCI_AUTO=y
> CONFIG_BLK_DEV_IDEDMA=y
> CONFIG_IDEDMA_AUTO=y
>
> What output do you get when you try to set DMA?
I didn't mean to CC you, i just hit reply assuming it would go to the
list but it went t you instead. My DMA settings in the kernel are:
CONFIG_BLK_DEV_IDEDMA_PCI=y
# CONFIG_BLK_DEV_IDEDMA_FORCED is not set
CONFIG_IDEDMA_PCI_AUTO=y
# CONFIG_IDEDMA_ONLYDISK is not set
CONFIG_BLK_DEV_IDEDMA=y
# CONFIG_IDEDMA_PCI_WIP is not set
# CONFIG_BLK_DEV_ADMA100 is not set
# CONFIG_HPT34X_AUTODMA is not set
CONFIG_IDEDMA_AUTO=y
# CONFIG_IDEDMA_IVB is not set
# CONFIG_DMA_NONPCI is not set
# CONFIG_SCSI_EATA_DMA is not set
When i try and set DMA i get the following error:
/dev/hdc:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma = 0 (off)
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