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

[TMC <tmciolek@xxxxxxxxx>]

I am not sure if testing like this in Dom0 is a good thing.  Dom0 is
"special" and should not run any precesses that hit disk hard. thats
the job for DomU

Regards
TMC

On 03/03/07, Tom Mornini <tmornini@xxxxxxxxxxxxxx> wrote:
> 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.
>
> --
> -- Tom Mornini, CTO
> -- Engine Yard, Ruby on Rails Hosting
> -- Reliability, Ease of Use, Scalability
> -- (866) 518-YARD (9273)
>
> 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
> >
> > _______________________________________________
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> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
>
>
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