Droebbel wrote: > On recent kernels, writing to DVD-RAM is much slower than to be > expected. A 3x Writer should do about 1.9MB/s including automatic > verify. This is what I get with 2.6.7 up to bk7. However, from 2.6.7-bk8 > to 2.6.10 write speed is as low as 600 to 1000 kB/s. The drive's head > jumps a lot more with these kernels. Reading is ok. > > I tested UDF and ext2 filesystems, > DMA is ok according to hdparm, > I set taskfile-io on and off when building the kernels, > and I compared the settings for the io-scheduler. > > The drive is connected via onboard via82xx ide or usb2 external (both > works perfectly with hd). > > The drive is a LG GSA-4163B; a GSA-4120 had the same problem as far as I > remember. > > Medium: Panasonic 3x > > Could not find any kernel error messages.
I have: Host: scsi1 Channel: 00 Id: 00 Lun: 00 Vendor: HL-DT-ST Model: DVDRAM GSA-4160B Rev: A300 Type: CD-ROM ANSI SCSI revision: 02 I also notice this with 2.6.10. I think I also had it with 2.6.8.1 but I don't remember, it's been a while. The media I use is maxell DRM47 ver 2 (whatever that means). I don't notice any jumping, but the system is quite noisy as it is. I have this same drive at work in a usb2 box but haven't had the opportunity to try dvdram. The DVDRAM above is not using ide-scsi emulation, it has a hardware scsi-ide converter from Acard. (I already have my ide ports used). The scsi controller is an adaptec dual u320 onboard (supermicro x5da8) -- Lab tests show that use of micro$oft causes cancer in lab animals - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
