Re: [Xen-users] dom0 hangs in xen 4.0.1-rc3-pre

[Bruce Edge <bruce.edge@gmail.com>]

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On Mon, Sep 27, 2010 at 7:22 AM, Andreas Kinzler <ml-xen-users@hfp.de>wrote:

> On 27.09.2010 16:06, Bruce Edge wrote:
>
>> I saw reproducible hangs in dom0 when the system is under heavy load.
>>>> four dom0s share a nfs server for domU images. a total number of 24
>>>> domUs
>>>> (6
>>>> domUs on each dom0). When the system under heavy load, busy processing
>>>> e-commerce requests, one or two of the dom0s hanged. no input can be
>>>> accepted and reboot is necessary.
>>>> Anyone had the same experience? The causes I can come up are following:
>>>>
>>> Please post your hardware (mainboard, chipset, CPU, RAID controller).
>>> I have found a severe problem on Lynnfield systems.
>>>
>> Does this affect all Nehalem chips or only the Lynnfields? The .21 kernel
>> is
>>
>> causing grief for us too.  I was wondering if this was related.
>>
>
> I am still researching this. For testing I bought a test system with
> Westmere-EP (Xeon E5620) which has ARAT. This system worked stable while
> Intel still lists it as having the C6 errata. This leads me to the
> conclusion that the HPET timer migration code (called HPET broadcast) from
> Xen is the root cause. This affects all CPUs that use it - but mainly
> Nehalem because of turbo mode.
>
> Regards Andreas
>

Andreas,
Thanks for the info. I'll try disabling turbo mode in the BIOS and see if
that helps.
Let me know if there's anything I can run/do/test/etc.

-Bruce

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