Re: PATA-disk named sda
On 07/06/2007 02:30 PM, Christoph Pleger wrote: And what about hdparm (setting 32bit I/O and multi-sector mode)? Suren wrote that 32bit I/O makes no sense when using DMA. Maybe that's right, but it does not correspond with my experiences. At least, I have the "feeling" that my IDE disks work much faster since I enabled 32bit support (DMA already was on before). hdparm -t /dev/hda (or /dev/sda -- it works for the SD interface as well) is a quick test of a drive's sequential read speed. I have, at the time, noticed at least on older controllers/drives (Intel 430 generation chipsets with things like 8G UDMA33 disks) that I could reliably increase the result with something like 1MB/s (to a total of 6 to 8, so it wasn't insignificant) by enabling 32-bit I/O. Had also understood that it shouldn't make a difference with DMA, but just went "oh well" and stuck a "hdparm -c1" in my bootup scripts. (if anyone tries; note that hdparm -a can have a large effect on that result as well on some setups -- on machines where it does, -a 1024 usually gives me best results) Rene. - 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/
Re: PATA-disk named sda
On Jul 6 2007 13:55, Mark Lord wrote: > Christoph Pleger wrote: >> Hello, >> >> > In recent kernels both PATA and SATA (SCSI too) drives are handled by >> > libata library. It calls all the drives sd* . >> >> If so, what about the use of hdparm then? I could not change parameters >> like DMA, MultSectIO and 32-Bit support with hdparm. sdparm also did not >> do that work. > > hdparm will still work for most functions, > but setting dma, multsectio, and 32-bit are now solely > the responsibility of the kernel (libata), for now. Yeah. `smartctl -d ata -a /dev/sda` is also one to work :) Jan -- - 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/
Re: PATA-disk named sda
On Jul 6 2007 13:55, Mark Lord wrote: Christoph Pleger wrote: Hello, In recent kernels both PATA and SATA (SCSI too) drives are handled by libata library. It calls all the drives sd* . If so, what about the use of hdparm then? I could not change parameters like DMA, MultSectIO and 32-Bit support with hdparm. sdparm also did not do that work. hdparm will still work for most functions, but setting dma, multsectio, and 32-bit are now solely the responsibility of the kernel (libata), for now. Yeah. `smartctl -d ata -a /dev/sda` is also one to work :) Jan -- - 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/
Re: PATA-disk named sda
On 07/06/2007 02:30 PM, Christoph Pleger wrote: And what about hdparm (setting 32bit I/O and multi-sector mode)? Suren wrote that 32bit I/O makes no sense when using DMA. Maybe that's right, but it does not correspond with my experiences. At least, I have the feeling that my IDE disks work much faster since I enabled 32bit support (DMA already was on before). hdparm -t /dev/hda (or /dev/sda -- it works for the SD interface as well) is a quick test of a drive's sequential read speed. I have, at the time, noticed at least on older controllers/drives (Intel 430 generation chipsets with things like 8G UDMA33 disks) that I could reliably increase the result with something like 1MB/s (to a total of 6 to 8, so it wasn't insignificant) by enabling 32-bit I/O. Had also understood that it shouldn't make a difference with DMA, but just went oh well and stuck a hdparm -c1 in my bootup scripts. (if anyone tries; note that hdparm -a can have a large effect on that result as well on some setups -- on machines where it does, -a 1024 usually gives me best results) Rene. - 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/
Re: PATA-disk named sda
On Friday 06 July 2007, Mark Lord wrote: > Robert Hancock wrote: > >.. > > Currently the DMA, multi-sector mode, etc. are not controllable with > > hdparm with libata. libata is designed to use the fastest settings > > possible by default. In a lot of cases this messing with hdparm was only > > needed because of stupidity with the old IDE code (like DMA not being > > automatically enabled if the low-level driver was built modular). > > Actually, most of the hdparm flags were put there to help test the IDE > subsystem and to help debug the much stranger hardware it had to deal with. > > "DMA off by default" was a Linus Torvalds request, to help ensure data safety > with all of the weird and wonderful crap pre-standardization. Exactly as Mark says. I just want to add that "DMA off by default" hasn't been a case for a long time now and since 2.6.21 the config option for "DMA on by default" is also finally gone (to make a long story short: this was the best way to fix some bugs while not causing regressions, not to mention that it was defaulting to Y for years). Thanks, Bart - 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/
Re: PATA-disk named sda
Robert Hancock wrote: .. Currently the DMA, multi-sector mode, etc. are not controllable with hdparm with libata. libata is designed to use the fastest settings possible by default. In a lot of cases this messing with hdparm was only needed because of stupidity with the old IDE code (like DMA not being automatically enabled if the low-level driver was built modular). Actually, most of the hdparm flags were put there to help test the IDE subsystem and to help debug the much stranger hardware it had to deal with. "DMA off by default" was a Linus Torvalds request, to help ensure data safety with all of the weird and wonderful crap pre-standardization. Cheers - 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/
Re: PATA-disk named sda
Christoph Pleger wrote: Hello, In recent kernels both PATA and SATA (SCSI too) drives are handled by libata library. It calls all the drives sd* . If so, what about the use of hdparm then? I could not change parameters like DMA, MultSectIO and 32-Bit support with hdparm. sdparm also did not do that work. hdparm will still work for most functions, but setting dma, multsectio, and 32-bit are now solely the responsibility of the kernel (libata), for now. Cheers - 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/
Re: PATA-disk named sda
Hi, On Friday 06 July 2007, Robert Hancock wrote: > Christoph Pleger wrote: > > Hello, > > > >>> In the newest Ubuntu Release, my PATA-disk is called sda instead of > >>> hda. Is that a general feature in newer kernel versions or is it a > >>> special feature in Ubuntu? > >> General. SATA and now PATA drives map onto the /dev/sd range as do > >> SCSI, USB etc > > > > It seems to be not that simple, at least not if both the old IDE > > interface and the new libata interface are enabled as modules: In my > > Ubuntu system, I created two kernel packages (from the same kernel > > source and with the same configuration) and installed them. Afterwards, > > I re-created the initial ramdisks, one with the Ubuntu feisty utilities > > and one with Debian etch utilities. So, I had the same kernel with > > different ramdisks. With the Ubuntu ramdisk, my harddrive was named sda, > > but with the Debian ramdisk, it was named hda. > > > > So, the name of the drive can depend on something which happens in the > > ramdisk environment. Does anybody know what that is? And is there a > > kernel command line parameter which restores the old behaviour? > > > > And what about hdparm (setting 32bit I/O and multi-sector mode)? Suren > > wrote that 32bit I/O makes no sense when using DMA. Maybe that's right, > > but it does not correspond with my experiences. At least, I have the > > "feeling" that my IDE disks work much faster since I enabled 32bit > > support (DMA already was on before). > > No, it has absolutely no effect in DMA mode. > > Currently the DMA, multi-sector mode, etc. are not controllable with > hdparm with libata. libata is designed to use the fastest settings > possible by default. In a lot of cases this messing with hdparm was only > needed because of stupidity with the old IDE code (like DMA not being > automatically enabled if the low-level driver was built modular). AFAIR there has never been such issue with IDE subsystem. In modular case you just have to remember to _not_ load generic IDE host driver if you don't need it, same with libata PATA. Bart - 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/
Re: PATA-disk named sda
> So, the name of the drive can depend on something which happens in the > ramdisk environment. Does anybody know what that is? And is there a > kernel command line parameter which restores the old behaviour? Old IDE -> /dev/hd* LibATA -> /dev/sd* so if you build both sets of modules it depends who gets loaded first. > And what about hdparm (setting 32bit I/O and multi-sector mode)? Suren > wrote that 32bit I/O makes no sense when using DMA. Maybe that's right, > but it does not correspond with my experiences. At least, I have the > "feeling" that my IDE disks work much faster since I enabled 32bit > support (DMA already was on before). 32bit I/O and multi-sector I/O are PIO specific features - they have no effect on DMA performance. 32bit is on my todo list but very low priority as for most systems it makes almost no difference. Alan - 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/
Re: PATA-disk named sda
Christoph Pleger wrote: Hello, In the newest Ubuntu Release, my PATA-disk is called sda instead of hda. Is that a general feature in newer kernel versions or is it a special feature in Ubuntu? General. SATA and now PATA drives map onto the /dev/sd range as do SCSI, USB etc It seems to be not that simple, at least not if both the old IDE interface and the new libata interface are enabled as modules: In my Ubuntu system, I created two kernel packages (from the same kernel source and with the same configuration) and installed them. Afterwards, I re-created the initial ramdisks, one with the Ubuntu feisty utilities and one with Debian etch utilities. So, I had the same kernel with different ramdisks. With the Ubuntu ramdisk, my harddrive was named sda, but with the Debian ramdisk, it was named hda. So, the name of the drive can depend on something which happens in the ramdisk environment. Does anybody know what that is? And is there a kernel command line parameter which restores the old behaviour? And what about hdparm (setting 32bit I/O and multi-sector mode)? Suren wrote that 32bit I/O makes no sense when using DMA. Maybe that's right, but it does not correspond with my experiences. At least, I have the "feeling" that my IDE disks work much faster since I enabled 32bit support (DMA already was on before). No, it has absolutely no effect in DMA mode. Currently the DMA, multi-sector mode, etc. are not controllable with hdparm with libata. libata is designed to use the fastest settings possible by default. In a lot of cases this messing with hdparm was only needed because of stupidity with the old IDE code (like DMA not being automatically enabled if the low-level driver was built modular). -- Robert Hancock Saskatoon, SK, Canada To email, remove "nospam" from [EMAIL PROTECTED] Home Page: http://www.roberthancock.com/ - 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/
Re: PATA-disk named sda
Christoph Pleger wrote: Hello, Hi, In the newest Ubuntu Release, my PATA-disk is called sda instead of hda. Is that a general feature in newer kernel versions or is it a special feature in Ubuntu? General. SATA and now PATA drives map onto the /dev/sd range as do SCSI, USB etc It seems to be not that simple, at least not if both the old IDE interface and the new libata interface are enabled as modules: In my Ubuntu system, I created two kernel packages (from the same kernel source and with the same configuration) and installed them. Afterwards, I re-created the initial ramdisks, one with the Ubuntu feisty utilities and one with Debian etch utilities. So, I had the same kernel with different ramdisks. With the Ubuntu ramdisk, my harddrive was named sda, but with the Debian ramdisk, it was named hda. So, the name of the drive can depend on something which happens in the ramdisk environment. Does anybody know what that is? And is there a kernel command line parameter which restores the old behaviour? The boot options are different depending on the distribution you are using. Every distribution has his own magic for this kind things. ( Debian and Ubuntu should have a man page with boot parameters ) On kernels with both IDE and PATA enabled as modules , depends on what you load first / include in your initramfs. If you load the IDE subsystem first you get HD*'s while with PATA you get SD*'s. I don't use Debian nor Ubuntu but it looks like Ubuntu has PATA as default while Debian has IDE. Regards Christoph Gabriel - 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/
Re: PATA-disk named sda
Hello, > > In the newest Ubuntu Release, my PATA-disk is called sda instead of > > hda. Is that a general feature in newer kernel versions or is it a > > special feature in Ubuntu? > > General. SATA and now PATA drives map onto the /dev/sd range as do > SCSI, USB etc It seems to be not that simple, at least not if both the old IDE interface and the new libata interface are enabled as modules: In my Ubuntu system, I created two kernel packages (from the same kernel source and with the same configuration) and installed them. Afterwards, I re-created the initial ramdisks, one with the Ubuntu feisty utilities and one with Debian etch utilities. So, I had the same kernel with different ramdisks. With the Ubuntu ramdisk, my harddrive was named sda, but with the Debian ramdisk, it was named hda. So, the name of the drive can depend on something which happens in the ramdisk environment. Does anybody know what that is? And is there a kernel command line parameter which restores the old behaviour? And what about hdparm (setting 32bit I/O and multi-sector mode)? Suren wrote that 32bit I/O makes no sense when using DMA. Maybe that's right, but it does not correspond with my experiences. At least, I have the "feeling" that my IDE disks work much faster since I enabled 32bit support (DMA already was on before). Regards Christoph - 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/
Re: PATA-disk named sda
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Christoph Pleger schrieb: > Hello, > > In the newest Ubuntu Release, my PATA-disk is called sda instead of hda. > Is that a general feature in newer kernel versions or is it a special > feature in Ubuntu? IIRC it is relatet to a new libata2 library. My Fedora 7 shows the same behavior. Regrads, Uwe -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFGjhVer6SFaBB7DLURAs9kAKCutDEn7kfxpKQia3zP6i0WIoXsRwCfQgDl /nNcRPH3lzrzy3pGuNDZAsw= =xPle -END PGP SIGNATURE- - 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/
Re: PATA-disk named sda
On Fri, 6 Jul 2007 10:21:32 +0200 Christoph Pleger <[EMAIL PROTECTED]> wrote: > Hello, > > In the newest Ubuntu Release, my PATA-disk is called sda instead of hda. > Is that a general feature in newer kernel versions or is it a special > feature in Ubuntu? General. SATA and now PATA drives map onto the /dev/sd range as do SCSI, USB etc - 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/
Re: PATA-disk named sda
On Friday 06 July 2007 14:36:18 Christoph Pleger wrote: > Hello, > > > In recent kernels both PATA and SATA (SCSI too) drives are handled by > > libata library. It calls all the drives sd* . > > If so, what about the use of hdparm then? I could not change parameters > like DMA, MultSectIO and 32-Bit support with hdparm. sdparm also did not > do that work. > > Regards > Christoph > - > 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/ There was a discussion about this on http://www.redhat.com/archives/fedora-devel-list/2007-April/msg01079.html Which concludes with what Alan Cox wrote. "In DMA modes the 32bit I/O feature and multi-sector mode are not used. For the moment libata also only supports 32bit PIO on some controllers and for those it si handled automatically. Over time it may well gain 32bit support for more, but again the goal is it will be entirely automatically done if so." - 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/
Re: PATA-disk named sda
El Fri, 6 Jul 2007 10:21:32 +0200 Christoph Pleger <[EMAIL PROTECTED]> escribió: > Hello, > > In the newest Ubuntu Release, my PATA-disk is called sda instead of hda. > Is that a general feature in newer kernel versions or is it a special > feature in Ubuntu? You can get information here https://wiki.ubuntu.com/LibAtaForAtaDisks > > Regards > Christoph > - > 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/ -- Nunca discutas con un idiota. Al final te hacen rebajarte a su nivel y entonces te acaban ganando debido a su mayor experiencia. - 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/
Re: PATA-disk named sda
Hello, > In recent kernels both PATA and SATA (SCSI too) drives are handled by > libata library. It calls all the drives sd* . If so, what about the use of hdparm then? I could not change parameters like DMA, MultSectIO and 32-Bit support with hdparm. sdparm also did not do that work. Regards Christoph - 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/
Re: PATA-disk named sda
On Friday 06 July 2007 13:21:32 Christoph Pleger wrote: > Hello, > > In the newest Ubuntu Release, my PATA-disk is called sda instead of hda. > Is that a general feature in newer kernel versions or is it a special > feature in Ubuntu? > > Regards > Christoph > - > 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/ In recent kernels both PATA and SATA (SCSI too) drives are handled by libata library. It calls all the drives sd* . More info: http://linux-ata.org/ - 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/
PATA-disk named sda
Hello, In the newest Ubuntu Release, my PATA-disk is called sda instead of hda. Is that a general feature in newer kernel versions or is it a special feature in Ubuntu? Regards Christoph - 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/
PATA-disk named sda
Hello, In the newest Ubuntu Release, my PATA-disk is called sda instead of hda. Is that a general feature in newer kernel versions or is it a special feature in Ubuntu? Regards Christoph - 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/
Re: PATA-disk named sda
Hello, In recent kernels both PATA and SATA (SCSI too) drives are handled by libata library. It calls all the drives sd* . If so, what about the use of hdparm then? I could not change parameters like DMA, MultSectIO and 32-Bit support with hdparm. sdparm also did not do that work. Regards Christoph - 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/
Re: PATA-disk named sda
El Fri, 6 Jul 2007 10:21:32 +0200 Christoph Pleger [EMAIL PROTECTED] escribió: Hello, In the newest Ubuntu Release, my PATA-disk is called sda instead of hda. Is that a general feature in newer kernel versions or is it a special feature in Ubuntu? You can get information here https://wiki.ubuntu.com/LibAtaForAtaDisks Regards Christoph - 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/ -- Nunca discutas con un idiota. Al final te hacen rebajarte a su nivel y entonces te acaban ganando debido a su mayor experiencia. - 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/
Re: PATA-disk named sda
On Friday 06 July 2007 13:21:32 Christoph Pleger wrote: Hello, In the newest Ubuntu Release, my PATA-disk is called sda instead of hda. Is that a general feature in newer kernel versions or is it a special feature in Ubuntu? Regards Christoph - 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/ In recent kernels both PATA and SATA (SCSI too) drives are handled by libata library. It calls all the drives sd* . More info: http://linux-ata.org/ - 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/
Re: PATA-disk named sda
On Friday 06 July 2007 14:36:18 Christoph Pleger wrote: Hello, In recent kernels both PATA and SATA (SCSI too) drives are handled by libata library. It calls all the drives sd* . If so, what about the use of hdparm then? I could not change parameters like DMA, MultSectIO and 32-Bit support with hdparm. sdparm also did not do that work. Regards Christoph - 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/ There was a discussion about this on http://www.redhat.com/archives/fedora-devel-list/2007-April/msg01079.html Which concludes with what Alan Cox wrote. In DMA modes the 32bit I/O feature and multi-sector mode are not used. For the moment libata also only supports 32bit PIO on some controllers and for those it si handled automatically. Over time it may well gain 32bit support for more, but again the goal is it will be entirely automatically done if so. - 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/
Re: PATA-disk named sda
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Christoph Pleger schrieb: Hello, In the newest Ubuntu Release, my PATA-disk is called sda instead of hda. Is that a general feature in newer kernel versions or is it a special feature in Ubuntu? IIRC it is relatet to a new libata2 library. My Fedora 7 shows the same behavior. Regrads, Uwe -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFGjhVer6SFaBB7DLURAs9kAKCutDEn7kfxpKQia3zP6i0WIoXsRwCfQgDl /nNcRPH3lzrzy3pGuNDZAsw= =xPle -END PGP SIGNATURE- - 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/
Re: PATA-disk named sda
On Fri, 6 Jul 2007 10:21:32 +0200 Christoph Pleger [EMAIL PROTECTED] wrote: Hello, In the newest Ubuntu Release, my PATA-disk is called sda instead of hda. Is that a general feature in newer kernel versions or is it a special feature in Ubuntu? General. SATA and now PATA drives map onto the /dev/sd range as do SCSI, USB etc - 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/
Re: PATA-disk named sda
Hello, In the newest Ubuntu Release, my PATA-disk is called sda instead of hda. Is that a general feature in newer kernel versions or is it a special feature in Ubuntu? General. SATA and now PATA drives map onto the /dev/sd range as do SCSI, USB etc It seems to be not that simple, at least not if both the old IDE interface and the new libata interface are enabled as modules: In my Ubuntu system, I created two kernel packages (from the same kernel source and with the same configuration) and installed them. Afterwards, I re-created the initial ramdisks, one with the Ubuntu feisty utilities and one with Debian etch utilities. So, I had the same kernel with different ramdisks. With the Ubuntu ramdisk, my harddrive was named sda, but with the Debian ramdisk, it was named hda. So, the name of the drive can depend on something which happens in the ramdisk environment. Does anybody know what that is? And is there a kernel command line parameter which restores the old behaviour? And what about hdparm (setting 32bit I/O and multi-sector mode)? Suren wrote that 32bit I/O makes no sense when using DMA. Maybe that's right, but it does not correspond with my experiences. At least, I have the feeling that my IDE disks work much faster since I enabled 32bit support (DMA already was on before). Regards Christoph - 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/
Re: PATA-disk named sda
Christoph Pleger wrote: Hello, In the newest Ubuntu Release, my PATA-disk is called sda instead of hda. Is that a general feature in newer kernel versions or is it a special feature in Ubuntu? General. SATA and now PATA drives map onto the /dev/sd range as do SCSI, USB etc It seems to be not that simple, at least not if both the old IDE interface and the new libata interface are enabled as modules: In my Ubuntu system, I created two kernel packages (from the same kernel source and with the same configuration) and installed them. Afterwards, I re-created the initial ramdisks, one with the Ubuntu feisty utilities and one with Debian etch utilities. So, I had the same kernel with different ramdisks. With the Ubuntu ramdisk, my harddrive was named sda, but with the Debian ramdisk, it was named hda. So, the name of the drive can depend on something which happens in the ramdisk environment. Does anybody know what that is? And is there a kernel command line parameter which restores the old behaviour? And what about hdparm (setting 32bit I/O and multi-sector mode)? Suren wrote that 32bit I/O makes no sense when using DMA. Maybe that's right, but it does not correspond with my experiences. At least, I have the feeling that my IDE disks work much faster since I enabled 32bit support (DMA already was on before). No, it has absolutely no effect in DMA mode. Currently the DMA, multi-sector mode, etc. are not controllable with hdparm with libata. libata is designed to use the fastest settings possible by default. In a lot of cases this messing with hdparm was only needed because of stupidity with the old IDE code (like DMA not being automatically enabled if the low-level driver was built modular). -- Robert Hancock Saskatoon, SK, Canada To email, remove nospam from [EMAIL PROTECTED] Home Page: http://www.roberthancock.com/ - 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/
Re: PATA-disk named sda
Christoph Pleger wrote: Hello, Hi, In the newest Ubuntu Release, my PATA-disk is called sda instead of hda. Is that a general feature in newer kernel versions or is it a special feature in Ubuntu? General. SATA and now PATA drives map onto the /dev/sd range as do SCSI, USB etc It seems to be not that simple, at least not if both the old IDE interface and the new libata interface are enabled as modules: In my Ubuntu system, I created two kernel packages (from the same kernel source and with the same configuration) and installed them. Afterwards, I re-created the initial ramdisks, one with the Ubuntu feisty utilities and one with Debian etch utilities. So, I had the same kernel with different ramdisks. With the Ubuntu ramdisk, my harddrive was named sda, but with the Debian ramdisk, it was named hda. So, the name of the drive can depend on something which happens in the ramdisk environment. Does anybody know what that is? And is there a kernel command line parameter which restores the old behaviour? The boot options are different depending on the distribution you are using. Every distribution has his own magic for this kind things. ( Debian and Ubuntu should have a man page with boot parameters ) On kernels with both IDE and PATA enabled as modules , depends on what you load first / include in your initramfs. If you load the IDE subsystem first you get HD*'s while with PATA you get SD*'s. I don't use Debian nor Ubuntu but it looks like Ubuntu has PATA as default while Debian has IDE. Regards Christoph Gabriel - 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/
Re: PATA-disk named sda
So, the name of the drive can depend on something which happens in the ramdisk environment. Does anybody know what that is? And is there a kernel command line parameter which restores the old behaviour? Old IDE - /dev/hd* LibATA - /dev/sd* so if you build both sets of modules it depends who gets loaded first. And what about hdparm (setting 32bit I/O and multi-sector mode)? Suren wrote that 32bit I/O makes no sense when using DMA. Maybe that's right, but it does not correspond with my experiences. At least, I have the feeling that my IDE disks work much faster since I enabled 32bit support (DMA already was on before). 32bit I/O and multi-sector I/O are PIO specific features - they have no effect on DMA performance. 32bit is on my todo list but very low priority as for most systems it makes almost no difference. Alan - 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/
Re: PATA-disk named sda
Hi, On Friday 06 July 2007, Robert Hancock wrote: Christoph Pleger wrote: Hello, In the newest Ubuntu Release, my PATA-disk is called sda instead of hda. Is that a general feature in newer kernel versions or is it a special feature in Ubuntu? General. SATA and now PATA drives map onto the /dev/sd range as do SCSI, USB etc It seems to be not that simple, at least not if both the old IDE interface and the new libata interface are enabled as modules: In my Ubuntu system, I created two kernel packages (from the same kernel source and with the same configuration) and installed them. Afterwards, I re-created the initial ramdisks, one with the Ubuntu feisty utilities and one with Debian etch utilities. So, I had the same kernel with different ramdisks. With the Ubuntu ramdisk, my harddrive was named sda, but with the Debian ramdisk, it was named hda. So, the name of the drive can depend on something which happens in the ramdisk environment. Does anybody know what that is? And is there a kernel command line parameter which restores the old behaviour? And what about hdparm (setting 32bit I/O and multi-sector mode)? Suren wrote that 32bit I/O makes no sense when using DMA. Maybe that's right, but it does not correspond with my experiences. At least, I have the feeling that my IDE disks work much faster since I enabled 32bit support (DMA already was on before). No, it has absolutely no effect in DMA mode. Currently the DMA, multi-sector mode, etc. are not controllable with hdparm with libata. libata is designed to use the fastest settings possible by default. In a lot of cases this messing with hdparm was only needed because of stupidity with the old IDE code (like DMA not being automatically enabled if the low-level driver was built modular). AFAIR there has never been such issue with IDE subsystem. In modular case you just have to remember to _not_ load generic IDE host driver if you don't need it, same with libata PATA. Bart - 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/
Re: PATA-disk named sda
Christoph Pleger wrote: Hello, In recent kernels both PATA and SATA (SCSI too) drives are handled by libata library. It calls all the drives sd* . If so, what about the use of hdparm then? I could not change parameters like DMA, MultSectIO and 32-Bit support with hdparm. sdparm also did not do that work. hdparm will still work for most functions, but setting dma, multsectio, and 32-bit are now solely the responsibility of the kernel (libata), for now. Cheers - 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/
Re: PATA-disk named sda
Robert Hancock wrote: .. Currently the DMA, multi-sector mode, etc. are not controllable with hdparm with libata. libata is designed to use the fastest settings possible by default. In a lot of cases this messing with hdparm was only needed because of stupidity with the old IDE code (like DMA not being automatically enabled if the low-level driver was built modular). Actually, most of the hdparm flags were put there to help test the IDE subsystem and to help debug the much stranger hardware it had to deal with. DMA off by default was a Linus Torvalds request, to help ensure data safety with all of the weird and wonderful crap pre-standardization. Cheers - 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/
Re: PATA-disk named sda
On Friday 06 July 2007, Mark Lord wrote: Robert Hancock wrote: .. Currently the DMA, multi-sector mode, etc. are not controllable with hdparm with libata. libata is designed to use the fastest settings possible by default. In a lot of cases this messing with hdparm was only needed because of stupidity with the old IDE code (like DMA not being automatically enabled if the low-level driver was built modular). Actually, most of the hdparm flags were put there to help test the IDE subsystem and to help debug the much stranger hardware it had to deal with. DMA off by default was a Linus Torvalds request, to help ensure data safety with all of the weird and wonderful crap pre-standardization. Exactly as Mark says. I just want to add that DMA off by default hasn't been a case for a long time now and since 2.6.21 the config option for DMA on by default is also finally gone (to make a long story short: this was the best way to fix some bugs while not causing regressions, not to mention that it was defaulting to Y for years). Thanks, Bart - 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/
