Re: [Xen-users] dom0 freezes under high IO load - HP ML150 G2

[Tom Mornini <tmornini@xxxxxxxxxxxxxx>]

Hello Daniel.

We've had similar problems, but have received very little feedback  
from our machines.
Our setup is also not entirely similar to yours. :-)

Could you try something out?

Set a cron job to run every 1 minute:

  cat /proc/slabinfo >> /root/slabinfo.txt

When we do this, our problem gets *much* worse. I'd love to know if  
these are similar problems.
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On Mar 2, 2007, at 7:27 PM, Daniel Mealha Cabrita wrote:

> hi there,
>
>
>         Does anyone have have suggestions on how to proceed in this case?
>
>
> 	I've experiencing dom0 (xen 3.0.3, xen-3.0.4 and 3.0.4-testing)  
> lockups under
> heavy disk load (testing under dom0 directly).
> The hardware is a HP ML150 G2 with a HP 4ch SATA fakeraid (OEM  
> Adaptec 1420SA,
> sata_mv driver).
> 	The machine does not respond to network, keyboard not anything  
> noticeable
> when it happens.
>
> 	I've tried passing a number of parameters to kernel but no  
> success. The ones
> below even make things worse, causing a CPU0 soft lockup during boot:
> kernel = (hd0,0)/xen-3.0.4 dom0_mem=384M acpi=off noapic nolapic
>
> 	The disks runs in Linux kernel RAID5. High load to/from an  
> individual disk
> (the max an individual SATA HD can handle) does not cause any problem.
>
> 	Also, I've noticed that just after booting the machine does not  
> respond to
> pings nor anything from the network. If I locally ping from that to  
> another
> host, the network starts working. OR, if I wait enough time (several
> minutes), the machine's network starts to respond normally.
>
> 	I've got no soft lockups logged in /var/log/messages. Nor anything  
> strange
> enough to call my attention.
>
>         The problem does not happen with a non-Xen kernel.
> 	The machine firmware (BIOS if you like) is updated to the latest  
> version.
> 	Disabling all the non-essential hardware (USB, serial/parallel  
> ports, IDE
> ports, powersaving etc) makes no difference.
>
> 	When not under high disk load the machine seems stable, with  
> several domU VMs
> running happily under it.
>
> --
>  Daniel Mealha Cabrita
>  Divisao de Suporte Tecnico
>  AINFO / Reitoria / UTFPR
>  http://www.utfpr.edu.br
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users

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