Re: disabling libata

[Imre Gergely <imre.gergely@astral.ro>]

Erik Mouw wrote:
> On Fri, Feb 10, 2006 at 04:16:21PM +0200, Imre Gergely wrote:
>> Erik Mouw wrote:
>>> On Fri, Feb 10, 2006 at 03:40:22PM +0200, Imre Gergely wrote:
>>>> i have a SATA hardisk, and am using FC4 with default kernel
>>>> (2.6.14-1.1644_FC4). i was wondering if it's possible to tell the kernel to use
>>>> the old ATA driver with SATA support instead of libata, for my harddisk to
>>>> appear as hdX, and not sdX.
>>> Why would you want to do that? SATA are driven by libata and the disks
>>> turn up as SCSI devices. There's no way around that (yet).
>> if i recompile the kernel, and leave out the libata part, and compile in
>> support for SATA, under ATA, the harddisks turn up as normal IDE devices (ie
>> hde, hdf, etc). i would like that without recompiling. if it's possible of course.
> 
> Yes, I know that's possible for some SATA adapters, but my question is
> why would you want to do that? The SATA support in the IDE subsystem is
> deprecated, you should really use libata.
> 
> 
> Erik
> 

maybe it's just me... but it looks like if as SCSI device the whole thing is
slower than with IDE. i haven't tested it yet, but as sda the system load is
very high, i did some tests with dd, and the CPU usage is always at 98-100%.
and when i'm copying something to another disk, the other programs barely move,
sometimes even the mouse gets stuck. i dunno where this is coming from. i
thought i try with the old driver.

maybe if you could give me some hints about how to test the whole thing, i
could post some results. i know that driver change isn't the answer, but i
still wanted to know if one can switch between the old and the libata driver
without recompiling (with some boot parameters to the kernel perhaps).