Hi
The results of some further investigation on my SATA speed problem.
*Yet more follow up 3/July/2010:*
I am not at all sure where the problem lies however it appears that
libata is built in to the kernel and not created as a module.
I have tried ordinary IDE disks and the speed problem remains the same.
I suspect now that this problem relates to the removal of Combined mode
in kernel 2.6.22
I understand this may cause problems when the OLD ide drivers are
included in the kernel along with libata drivers.
I will be the first to admit I don't understand all this, but see the
following references:
Combined mode
h**p://www.mail-archive.com/[email protected]/msg04681.html
Performance issues after combined mode removed:
h**p://forum.soft32.com/linux/Combined-mode-quirk-removal-kills-performance-ftopict345203.html
Related stuff I don't understand
h**p://forum.soft32.com/linux/PATCH-22-remove-Intel-combined-mode-quirk-ftopict341159.html
A possible fix in kernel config
h**p://linux.derkeiler.com/Mailing-Lists/Kernel/2007-07/msg08563.html
Now all I need is to try a kernel built to endian standards but without
the old ide driver!!
Can anybody out there help me with this?
On 25/06/2010 16:42, Derek Sims wrote:
Hi
This is a repeat of a message I have posted on efwsupport.com forum
http://efwsupport.com/index.php?topic=1830.msg4834#msg4834
Can anybody suggest where I can locate the missing kernel module(s)?
part1
====
Very slow disk IO on SATA RAID1 Jetway NC92-330-LF
I have installed endian on a Jetway NC92-330-LF MB with two SATA HDD in
software RAID1
Apart from the install being very slow, after installation I am seeing
extremely slow IO on the hard disks.
hdparm -tT /dev/hda
/dev/hda:
Timing cached reads: 2392 MB in 2.00 seconds = 1195.39 MB/sec
Timing buffered disk reads: 10 MB in 3.08 seconds = 3.25 MB/sec
I was also surprised to see the disks using device hdX and not sdX!
Am I missing something here or does endian CE not fully support SATA?
part2
===
Just a follow up on my problems with 2.4 IO speed
I installed 2.3 on the same machine with no speed poblems at all
hdparm was showing 100MB/s Buffered read speed.
I also note that 2.3 was using kernel module libata and ata_piix as well
as some scsi modules.
libata is NOT present on my copy of endian CF 2.4
Can anybody suggest where I can get additional kernel modules?
Further follow-up
============
I have upgraded using efw-upgrade and the system has reverted to being
very slow!!
The disk devices are now showing as hda and hdb instead of sda and sdb
(I guess having raid 1 md devices allows it to boot)
kernel mosule ata_piix is loaded but no sign of libata.
This looks to me similar to the problem found at:
h**p://bugs.endian.com/view.php?id=208
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