[gentoo-user] Re: dd if=/dev/dvd of=backup.iso - DMA related problem
I've run onto few posting on Google regarding DMA resetting itself but no solution. That is simply annoying, that the Linux-Kernel resets DMA. You could try hdparm -k1 - but somethimes that doesn't help either. signature.asc Description: OpenPGP digital signature
Re: [gentoo-user] Re: dd if=/dev/dvd of=backup.iso - DMA related problem
On Thu, 2006-03-23 at 20:18 +0100, Sven Köhler wrote: I've run onto few posting on Google regarding DMA resetting itself but no solution. That is simply annoying, that the Linux-Kernel resets DMA. You could try hdparm -k1 - but somethimes that doesn't help either. Yes, I've tried -k1 too, it doesn't help. It seems like kernel bug, I was able to duplicate resetting CD/DVD DMA on both machines: amd64 with BenQ DVD writer and x86 with Plextor CD writer -- #Joseph -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] Re: dd if=/dev/dvd of=backup.iso - DMA related problem
On Thu, 2006-03-23 at 16:15 -0500, JimD wrote: On Thu, 23 Mar 2006 12:54:44 -0700 Joseph [EMAIL PROTECTED] wrote: Yes, I've tried -k1 too, it doesn't help. It seems like kernel bug, I was able to duplicate resetting CD/DVD DMA on both machines: amd64 with BenQ DVD writer and x86 with Plextor CD writer It might be a bug, though it probably is only for certain drives. I have a LITE-ON DVDRW LDW-451S on amd64. Here is a test I just ran: [EMAIL PROTECTED] $ sudo hdparm /dev/hdc /dev/hdc: IO_support = 1 (32-bit) unmaskirq= 1 (on) using_dma= 1 (on) keepsettings = 0 (off) readonly = 0 (off) readahead= 256 (on) HDIO_GETGEO failed: Invalid argument [EMAIL PROTECTED] $ sudo eject [EMAIL PROTECTED] $ sudo hdparm /dev/hdc /dev/hdc: IO_support = 1 (32-bit) unmaskirq= 1 (on) using_dma= 1 (on) keepsettings = 0 (off) readonly = 0 (off) readahead= 256 (on) HDIO_GETGEO failed: Invalid argument [EMAIL PROTECTED] $ sudo eject [EMAIL PROTECTED] $ sudo hdparm /dev/hdc /dev/hdc: IO_support = 1 (32-bit) unmaskirq= 1 (on) using_dma= 1 (on) keepsettings = 0 (off) readonly = 0 (off) readahead= 256 (on) HDIO_GETGEO failed: Invalid argument [EMAIL PROTECTED] $ eject --version eject version 2.1.0 by Jeff Tranter ([EMAIL PROTECTED]) Running eject as root or a regular user did not reset my DMA settings for my DVD-RW. Jim Before ejecting put any CD / DVD disk IN and run: dd if=/dev/hdc of=backup.iso or cat /dev/hdc backup.iso When finished run eject ... and hdparm /dev/hdc See if the parameter using_dma was reset. -- #Joseph -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] Re: dd if=/dev/dvd of=backup.iso - DMA related problem
On Thu, 2006-03-23 at 14:26 -0700, Joseph wrote: Before ejecting put any CD / DVD disk IN and run: dd if=/dev/hdc of=backup.iso or cat /dev/hdc backup.iso When finished run eject ... to be specific: eject /dev/hdc and hdparm /dev/hdc See if the parameter using_dma was reset. -- #Joseph -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] Re: dd if=/dev/dvd of=backup.iso - DMA related problem
On Thu, 23 Mar 2006 12:54:44 -0700 Joseph wrote: On Thu, 2006-03-23 at 20:18 +0100, Sven Köhler wrote: I've run onto few posting on Google regarding DMA resetting itself but no solution. That is simply annoying, that the Linux-Kernel resets DMA. You could try hdparm -k1 - but somethimes that doesn't help either. Yes, I've tried -k1 too, it doesn't help. It seems like kernel bug, I was able to duplicate resetting CD/DVD DMA on both machines: amd64 with BenQ DVD writer and x86 with Plextor CD writer -- #Joseph do they both use the same kernel version? -- Nick Rout [EMAIL PROTECTED] -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] Re: dd if=/dev/dvd of=backup.iso - DMA related problem
On Thu, 2006-03-23 at 17:25 -0500, JimD wrote: On Thu, 23 Mar 2006 14:26:20 -0700 Joseph [EMAIL PROTECTED] wrote: Before ejecting put any CD / DVD disk IN and run: dd if=/dev/hdc of=backup.iso or cat /dev/hdc backup.iso When finished run eject ... and hdparm /dev/hdc See if the parameter using_dma was reset. [EMAIL PROTECTED] # dd if=/dev/hdc of=backup.iso CTRL+C 37824+0 records in 37824+0 records out /tmp [EMAIL PROTECTED] # ls -l backup.iso -rw-r--r-- 1 root root 19M Mar 23 17:20 backup.iso [EMAIL PROTECTED] # hdparm /dev/hdc /dev/hdc: IO_support = 1 (32-bit) unmaskirq= 1 (on) using_dma= 1 (on) keepsettings = 0 (off) readonly = 0 (off) readahead= 256 (on) HDIO_GETGEO failed: Invalid argument DMA is still on. I don't know why I always get that HDIO_GETGEO failed error. Do you have another CD/DVD drive you can try? Are you using SCSI emulation? I am using kernel 2.6.15-gentoo-r7 Jim Did you do eject /dev/hdc between dd and hdparm? dd if=/dev/hdc of=backup.iso eject dev/hdc hdparm /dev/hdc Yes, I've tried this combination on two different machines with two different drives and DMA gests rest on both. amd64 + BenQ DVD x86 + Plexwriter I'm using kernel 2.6-15 -- #Joseph -- gentoo-user@gentoo.org mailing list
