I'm considering this a bug. Previous releases, which had the ide driver compiled into the kernel directly (just how does one say that succinctly anyway), had dma turned on by default (kernel option).
I'll have a look at the code and see if we can't get it turned _back_ on by default for the modular driver.
Thanks!
-Brian
Thus spake Ole Holm Nielsen ([EMAIL PROTECTED]):
A solution has been found ! Thanks to Bas van der Vlies and Gerben Roest. The conclusions are:
1. The SI 2.4.25 kernel has all IDE drivers as modules (check the SI source file systemimager/patches/linux.i386.config), so in order to get speedy I/O during installation you need to load manually the appropriate IDE driver in the SI master script (in /var/lib/systemimager/scripts/XXX_image.master). The IBM PCs we used in this case have the Intel i865 chipset with the Intel IDE chip. Find out your own chipset first !
2. By default DMA seems to be turned off, so you have to enable DMA manually (provided you have modern hardware). Although the "hdparm" tool can do this, "hdparm" isn't available in the standard SI, but there's another possibility: Use the file /proc/ide/ide0/hda/settings to read or write settings for the /dev/hda disk.
3. I modified my SI master script by adding just before the line ### BEGIN partition /dev/hda ### the following lines: echo "Loading ide chipset modules.." # Intel PIIX IDE driver modprobe piix # Setting harddisk speed to maximum! echo "io_32bit:1" > /proc/ide/ide0/hda/settings echo "using_dma:1" > /proc/ide/ide0/hda/settings echo "Updated harddisk parameters are" cat /proc/ide/ide0/hda/settings # sleep 10 # For checking the output visually
The transfer of a 2.0 GB disk image with a 100 Mbit/s Ethernet went down from about 15 minutes to about 4 minutes. The filesystem creation time was also much reduced.
Ole Holm Nielsen Department of Physics, Technical University of Denmark
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