Re: [Xen-users] Xenned box becomes unresponsive

[Andrew Lyon <andrew.lyon@xxxxxxxxx>]

On Mon, Dec 14, 2009 at 4:22 PM, flo <flo@xxxxxxxxx> wrote:
> It limits the machine to 4G:
>
> mem=xxx
>    Set the physical RAM address limit. Any RAM appearing beyond this
> physical address in the memory map will be ignored. This parameter may
> be specified with a B, K, M or G suffix, representing bytes, kilobytes,
> megabytes and gigabytes respectively. The default unit, if no suffix is
> specified, is kilobytes.
>
> http://tx.downloads.xensource.com/downloads/docs/user/#SECTION04130000000000000000
>
> On 12/14/2009 04:19 PM, Svoop wrote:
>>
>>
>> Florian Gleixner wrote:
>>>
>>> "mem=4G" as parameter for the xen hypervisor in grub:
>>>
>>
>> Do the 4G have to reflect the real memory or is it part of the workaround to
>> always set it to 4G? I'd like to try on another box which has 8G.
>>
>
>
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>

I have had similar problems with openSUSE dom0 kernels newer than
2.6.29, today Jan Beulich identified a problem which first appeared in
2.6.28 but which was masked by swiotlb settings in 2.6.29, he sent me
a patch which seems to have fixed the problem as my system has been
running 2.6.31.7 for 3 hours under heavy load with no issues at all,
previously it would crash or lockup within minutes of starting some
domU's, so you may want to try using a 11.2 or head kotd kernel from
ftp://ftp.suse.com/pub/projects/kernel/kotd/ in a few days time once
Jan has committed a final version of the fix.

Once .31 is completely stable I will release a rebased set of minimal
dom0 openSUSE patches as I've done before and which I hope to get
added to the Gentoo portage tree and will maintain for as long as
openSUSE 11.2 is maintained, I will also continue to update the 2.6.29
ebuild and patches and plan to track kotd master (currently .32) until
pv_ops is fully mature and functional, up until now the most up to
date reliable version was 2.6.29 but with this new patch .31 is
looking very positive.

Andy

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