kernel 2.6t9 SATA slower than 2.4.20

DISCUSSION Shaun Savage 4 participants 9 messages Oct 27, 2003 – Oct 28, 2003

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Shaun Savage

author

2003-10-27 15:56 UTC #0 lore raw

Quoted 3 lines

Are you using CONFIG_SCSI_SATA in 2.6?

No, but I am trying now.
GREAT is works,
but the disk went from hda back to hde

Quoted 1 line

Jeff

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Quoted 3 lines

I bet it's the "beat to death in lkml" issue with readahead.
What's the output of cat /proc/ide/hdX?

it hda see attached file "proc_ide_hda"

now the disk is hde again, do you want another proc files file?

Quoted 2 lines

Regards,
Nuno Silva

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Quoted 3 lines

What happens with you really test? ie. using programs (bonnie, iozone etc) to test disk speed? Is it still slower? I think that hdparm does not >tell the complete story.

No I have not but I will. But I assume that from 55M to 15M something is not configured correct.

Quoted 1 line

Ed Tomlinson

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Quoted 10 lines

I have just compiled and installed kernel 2.6t9 on my RH9 / Asus A7N8X Deluxe. I find the disk access is slower using the 2.6 kernel than the 2.4.20 kernel.
To get it to work for 2.4.20 kernel I have to use
# hdparm -d1 -X88 /dev/hde
then the buffered disk read goes from 1.5M to 55M
On the 2.6 kernel the buffered disk read is only 16M
What do I have to do to increase the disk speed for kernel 2.6t9?

Jeff Garzik

2003-10-27 16:59 UTC #1 lore raw

Quoted 7 lines · Shaun Savage

Quoted 3 lines
Are you using CONFIG_SCSI_SATA in 2.6?
No, but I am trying now.
GREAT is works,
but the disk went from hda back to hde

hmmm, with CONFIG_SCSI_SATA your SATA drives should show up as
/dev/sda not /dev/hde ...

So, you're still using the drivers/ide driver, it appears.

Regardless, it's most important to use what works for you ;-)

Jeff

Arve Knudsen

2003-10-27 17:37 UTC #2 lore raw

Quoted 9 lines · Jeff Garzik

Quoted 7 lines · Shaun Savage
Quoted 3 lines
Are you using CONFIG_SCSI_SATA in 2.6?
No, but I am trying now.
GREAT is works,
but the disk went from hda back to hde

Quoted 7 lines

hmmm, with CONFIG_SCSI_SATA your SATA drives should show up as
/dev/sda not /dev/hde ...
So, you're still using the drivers/ide driver, it appears.
Regardless, it's most important to use what works for you ;-)

Excuse me, there's probably something I'm missing, but how do I use the SCSI_SATA driver for SiI 3112? I see the source file for it in the kernel tree (test9), but no option for it in menuconfig (I've enabled SATA under SCSI). Enabling the SiI SATA driver under ATA/ATAPI... compiles in the old driver am I right?

Thanks

Arve Knudsen

Jeff Garzik

2003-10-27 18:18 UTC #3 lore raw

Quoted 16 lines · Arve Knudsen

Quoted 14 lines · Jeff Garzik
Quoted 7 lines · Shaun Savage
Quoted 3 lines
Are you using CONFIG_SCSI_SATA in 2.6?
No, but I am trying now.
GREAT is works,
but the disk went from hda back to hde
hmmm, with CONFIG_SCSI_SATA your SATA drives should show up as /dev/sda not /dev/hde ...
So, you're still using the drivers/ide driver, it appears.

Quoted 7 lines

Quoted 2 lines
Regardless, it's most important to use what works for you ;-)
Excuse me, there's probably something I'm missing, but how do I use the SCSI_SATA driver for SiI 3112? I see the source file for it in the kernel tree (test9), but no option for it in menuconfig (I've enabled SATA under SCSI). Enabling the SiI SATA driver under ATA/ATAPI... compiles in the old driver am I right?

For SiI, it requires CONFIG_BROKEN, because, well, the libata SiI is "very alpha quality" right now ;-)

Jeff

Arve Knudsen

2003-10-27 21:16 UTC #4 lore raw

Quoted 19 lines · Jeff Garzik

Quoted 18 lines · Arve Knudsen
Quoted 16 lines · Jeff Garzik
Quoted 7 lines · Shaun Savage
Quoted 3 lines
Are you using CONFIG_SCSI_SATA in 2.6?
No, but I am trying now.
GREAT is works,
but the disk went from hda back to hde
hmmm, with CONFIG_SCSI_SATA your SATA drives should show up as /dev/sda not /dev/hde ...
So, you're still using the drivers/ide driver, it appears.
Regardless, it's most important to use what works for you ;-)

Quoted 9 lines

Quoted 5 lines
Excuse me, there's probably something I'm missing, but how do I use the SCSI_SATA driver for SiI 3112? I see the source file for it in the kernel tree (test9), but no option for it in menuconfig (I've enabled SATA under SCSI). Enabling the SiI SATA driver under ATA/ATAPI... compiles in the old driver am I right?
For SiI, it requires CONFIG_BROKEN, because, well, the libata SiI is "very alpha quality" right now ;-)

Ok, thanks. So I might be better off with the older driver for now? From what I remember Andre Hedrick was promising a fix?

Regards

Arve Knudsen

Jeff Garzik

2003-10-27 22:10 UTC #5 lore raw

Quoted 1 line · Arve Knudsen

Ok, thanks. So I might be better off with the older driver for now? From what I remember Andre Hedrick was promising a fix?

Yes. Until CONFIG_BROKEN marker is removed, I recommend the older Silicon Image driver in drivers/ide.

Jeff

Bob Johnson

2003-10-27 18:09 UTC #6 lore raw

In reply to Shaun Savage

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The Sata driver worked well on my siimage, but lost around 30%-40% performance according to tiobench.

Bob

Quoted 9 lines · Shaun Savage

Quoted 1 line
Are you using CONFIG_SCSI_SATA in 2.6?
No, but I am trying now.
GREAT is works,
but the disk went from hda back to hde
Quoted 1 line
Jeff
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Jeff Garzik

2003-10-27 18:19 UTC #7 lore raw

Quoted 5 lines · Bob Johnson

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The Sata driver worked well on my siimage, but lost around 30%-40% performance according to tiobench.

This is to be expected -- I use a "sledgehammer fix" for the Maxtor and Seagate errata -- each transfer is limited to 15 sectors.

When I get a chance to clean up the SiI driver, the performance will indeed increase by a large amount.

For now, for Silicon Image, I recommend using the drivers/ide/pci/siimage.c -- assuming it works for you, of course.

The libata Silicon Image driver is marked with CONFIG_BROKEN because it is fairly easy to lock it up (I need ack some more interrupts).

Jeff

Shaun Savage

author

2003-10-28 04:14 UTC #8 lore raw

I have removed the IDE SiI driver now the hdparm buffered disk read are now 15M again. So you are right the IDE does give better performance but the SCSI SATA does need to be enabled. I Think ;\

Now I am trying to iptables working, then SELinux

Thanks
Shaun

Quoted 26 lines · Jeff Garzik

Quoted 5 lines · Bob Johnson
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The Sata driver worked well on my siimage, but lost around 30%-40% performance according to tiobench.
This is to be expected -- I use a "sledgehammer fix" for the Maxtor and Seagate errata -- each transfer is limited to 15 sectors.
When I get a chance to clean up the SiI driver, the performance will indeed increase by a large amount.
For now, for Silicon Image, I recommend using the drivers/ide/pci/siimage.c -- assuming it works for you, of course.
The libata Silicon Image driver is marked with CONFIG_BROKEN because it is fairly easy to lock it up (I need ack some more interrupts).
Jeff