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/
