On Thursday 25 April 2002 10:40 am, wrote:
> Tom Brinkman wrote:
> > /usr/src/linux-<kernel_version>/Documentation/ide.txt
> The original posted stated he was having trouble getting his
> harddrive to function at the expected UDMA 100 speed. He made these
> statements based on his obervations while running "hdparm" tests on
> his harddrive. He did not talk about PCI bus speed on the mobo. He
> did not mention anything about FSB. All this has been added by others
> who confused the issues because they did not understand the
> difference between these two elements.
Well, PCI bus speed which is determined from the FSB by the clock
divider chip on the mobo does have a lot to do with idebus= as ide.txt
correctly points out. 100, 133, 266, or even 400 FSB ... the PCI bus
and all HDD's, whether ide or scsi, still run on the good ol' 33mhz PCI
bus.
> only help I saw, for the original poster who wanted UDMA 100 to be
> set on his harddive, was made by the individual that suggested that
> the person should upgrade his kernel version. I wonder if someone
> could comment *specifically* on this situation...
That was me. I posted that a kernel upgrade would fix the problems
induced by 8.2's default kernel. I said I believed the default kernel
purposely restricts udma when it detects certain chipsets/controllers
on the motherboard. Civileme is probly the one that knows for sure. I
only suspect that to be the case.
Anyhow, whatever, ide=ata?? append lines and hdparm settings aren't
neccessary to get max HDD performance. A kernel that's built so as not
to safely fit the thousands of combinations of hardware and
configurations 8.2 may be installed on ...is. Any cooker kernel newer
than 2.4.18-6mdk will allow max HDD udma performance.
I don't understand why you might think that these issues are
removed from 'Sanity'. I see the topic come up all the time on mailing
lists and newsgroups, with the majority thinking errorenously that
idebus= equates to HDD speed/mode, when it clearly == the PCI bus.
--
Tom Brinkman Corpus Christi, Texas
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