On Saturday 18 June 2005 05:29 pm, Glenn English wrote: > I'm running a vanilla sarge install on a 2.8GHz P4, booting from a > SCSI disk. There's a SATA disk and an IDE. The IDE disk is hda. The > motherboard is an Intel 865. > > When writing a big file to hda, the CPU usage goes to 100% and stays > there for a long time. And it takes a lot longer to write to hda than > to the others. I interpret that to mean the system is doing > programmed I/O instead of DMA. > > hdparm -i /dev/hda says udma5 (out of a possible 6) is the transfer > mode. > > hdparm /dev/hda says > "using_dma = 0 (off)" > > hdparm -d1 /dev/hda says > "setting using_dma to 1 (on) > HDIO_SET_DMA failed: Operation not permitted" > > I've looked at the kernel config and the modules and lsmod. As best I > can tell all the IDE code is there -- that definitely doesn't mean it > is. I've tried this with a Quantum 20G and a Maxtor 200G with exactly > the same results (except the older drive does udma2, max). > > I googled and went through the tutorial at > > http://www.linuxdevcenter.com/pub/a/linux/2000/06/29/hdparm.html?page >=1 > > but got nothing like the I/O speed improvements shown there. I got > only a 5 or 10 percent improvement. > > What am I not understanding?
I think the problem is with the order in which the IDE modules get loaded., which afaik, it is an initrd/mkinitrd issue. Once Debian is installed, I couldn't figure out how to change this order, compiled my own kernel with the appropriate IDE driver compiled into the kernel. There may be a better way but this will work if you are stuck. BTW, this has been discussed on this list before so the archives will have more info also. -- Greg Madden -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
