Re: [Xen-devel] Re: Attempt to load 2.6.29-rc3 with pv_ops suppot for Dom0 under Xen 3.3.1 Hypervisor

[Boris Derzhavets <bderzhavets@xxxxxxxxx>]

Hardware config :-
CPU C2D E8400
ASUS P5K Premium/WIFI (P35 (Noth Bridge)+Intel ICH9R (South Bridge))
8 GB RAM
2 x SATA II 250 GB Seagate Barracuda ( no RAID, just /dev/sda and /dev/sdb)

Bios setup for South Bridge is AHCI. Works fine for :-

1. Xen 3.3.1 port to CentOS 5.2 (2.6.18-xen)
2. Xen 3.3.1 port Ubuntu 8.10 Server with Novell's Kernel 2.6.27.5
3. Xen Unstable port Ubuntu 8.10 Server with Novell's Kernel 2.6.27.5
4. Solaris Nevada build 106 (xvm 3.1.4)

All OS multiboot via Nevada Grub installed in MBR.

Each one has it's own grub installed into /boot or / partitions
referenced from main grub's menu as :-

title ......
rootnoverify (hdX,Y)
chainloader +1

I never turned  Intel ICH9R into IDE emulation mode (legacy mode),
due to significant performance degradation of SATA drives.
NCQ would be killed immediately

I don't mind to test new kernel (under Xen)  with ICH9R in legacy mode.
However, i believe that handling Intel Chips ICH9(10)R in AHCI mode
is very important for flagman linux kernels,supporting pv_ops in Dom0.
Legacy mode ( through my comrehension) would disable NCQ on SATA II
drives.
Boris.
--- On Mon, 2/2/09, Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:

From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: Re: [Xen-devel] Re: Attempt to load 2.6.29-rc3 with pv_ops suppot for Dom0 under Xen 3.3.1 Hypervisor
To: bderzhavets@xxxxxxxxx
Cc: "Todd Deshane" <deshantm@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, "Andrew Lyon" <andrew.lyon@xxxxxxxxx>, "Ian Campbell" <Ian.Campbell@xxxxxxxxxx>
Date: Monday, February 2, 2009, 12:32 PM

Boris Derzhavets wrote:
> 
> title Xen 3.4 / Ubuntu 8.10, kernel 2.6.29-tip
> uuid   c841c5e9-8eb2-4e47-b36e-6796e5ce6ce6
> kernel /boot/xen-3.4.gz
> module /boot/vmlinuz-2.6.29-rc3-tip root=/dev/sdb1 ro console=tty0
earlyprintk=xen pci=nomsi
> module /boot/initrd-2.6.29-rc3-tip.img
> 
> ******************************************************************
> Loading starts up and drops to stack trace immediately after
> SATA link up ..
> SATA link up ..
> *******************************************************************
> 

Can you transcribe a bit more detail here?  Are you trying o use AHCI or legacy
mode?  Or some other controller?

(Ian: did you commit that legacy IRQ fix?  If not I'll do it shortly.)

   J

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