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

[Daniel Mealha Cabrita <dancab@xxxxxxxxxxxx>]

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

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