Red Hat Bugzilla – Bug 445964
slow transfer speeds on >=2.6.24
Last modified: 2009-07-14 11:27:57 EDT
Description of problem:
Fedora does not set UDMA for disk, but it sets PIO4 mode. PIO4 is very slow and
Fedora is booting about 7 minutes (!). All applications are starting too much
time. For example gnome-terminal is starting about half minute on fluxbox; GDM
is starting about 1 minute to show login screen.
Currently Fedora is unusable because it is too slow. When system starts it
working normal until i try run some application.
Version-Release number of selected component (if applicable):
I do not know how i can reproduce this.
My hardware configuration and other important files is on attachments.
For test hard drive i used, and results in attachments:
# hdparm -tT /dev/sda
This is have place on kernels from 2.6.24.* to latest
I found mail-archive with patch for pata_amd (i have pata_atiixp) on:
Created attachment 305029 [details]
Created attachment 305030 [details]
Created attachment 305031 [details]
Created attachment 305032 [details]
Created attachment 305033 [details]
I forgot: this bug is on Fedora 8 (2.6.24.*) and Fedora 9 (2.6.25.*).
The key part of dmesg being this:
ata2.00: simplex DMA is claimed by other device, disabling DMA
I'm not sure what the hardware limitations are here, (perhaps Alan can clue us
in). It looks like you have the DVD drive as the primary master, and hard disk
as secondary. I wonder if reversing this situation would 'solve' this ? Alan ?
Yes, I have ASUS A9RP and it is true that DVD is on 1st master and harddrive on
1st slave. I checked this in BIOS.
But i notice that UDMA works perfectly on kernels before 2.6.24.
Fixed upstream now - its a combination of two bugs, one Fedora bug that has been
reported since early FC8 and one kernel thing which triggers a hardware funny.
Fix is in 2.6.26-rc, but the right fix for this (and some other fun) is to stop
loading pata_acpi *before* chipset specific drivers.
Ok, thanks, but how can i fix it temporarily until new kernel is released.
anaconda just runs udev for loading modules these days. Which then invokes
modprobe of the modalias. Of course, all matches for a modalias are "equally"
good as far as anything can tell other than doing explicit module name hacks in
But to modprobe
Changing version to '9' as part of upcoming Fedora 9 GA.
More information and reason for this action is here:
This message is a reminder that Fedora 9 is nearing its end of life.
Approximately 30 (thirty) days from now Fedora will stop maintaining
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Although we aim to fix as many bugs as possible during every release's
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The process we are following is described here:
Fedora 9 changed to end-of-life (EOL) status on 2009-07-10. Fedora 9 is
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