[Mavrick] SRU v2: Set maximum of domain visible memory to 70G

[Stefan Bader]

On 12/10/2010 04:02 PM, Stefan Bader wrote:
> On 12/10/2010 03:52 PM, Tim Gardner wrote:
>> On 12/10/2010 07:10 AM, Stefan Bader wrote:
>>> SRU justification:
>>>
>>> Impact: The config option XEN_MAX_DOMAIN_MEMORY controls how much memory
>>> a Xen instance is seeing. The default for 64bit is 32GB, which is the
>>> reason that m2.4xlarge instances only report this amount of memory.
>>>
>>> Fix: Setting this limit to 70GB as there is a known restriction for
>>> t1.micro instances at about 80GB.
>>>
>>> Testcase: Booted m2.4xlarge with this set to 32GB shows 32GB of memory,
>>> when set to 70GB, it correctly reports 68GB. Booted a t1.micro as well
>>> to verify this has not caused problems there.
>>>
>>>  From c72705539ee164cdd100570c1340887f81a63d98 Mon Sep 17 00:00:00 2001
>>> From: Stefan Bader<stefan.bader at canonical.com>
>>> Date: Thu, 9 Dec 2010 17:59:36 +0100
>>> Subject: [PATCH] UBUNTU: Set maximum of domain visible memory to 70G
>>>
>>> BugLink: http://bugs.launchpad.net/bugs/667796
>>>
>>> Otherwise the largest instances will be stuck with 32G of memory. 70G
>>> was chosen as there are some known problems on small instances around
>>> 80GB and the largest instance is using 68GB.
>>>
>>> Signed-off-by: Stefan Bader<stefan.bader at canonical.com>
>>> ---
>>>   debian.master/config/config.common.ubuntu |    2 +-
>>>   1 files changed, 1 insertions(+), 1 deletions(-)
>>>
>>> diff --git a/debian.master/config/config.common.ubuntu
>>> b/debian.master/config/config.common.ubuntu
>>> index b0c486b..ed8ad01 100644
>>> --- a/debian.master/config/config.common.ubuntu
>>> +++ b/debian.master/config/config.common.ubuntu
>>> @@ -5014,7 +5014,7 @@ CONFIG_XEN_COMPAT_XENFS=y
>>>   CONFIG_XEN_DEV_EVTCHN=m
>>>   CONFIG_XEN_FBDEV_FRONTEND=m
>>>   CONFIG_XEN_KBDDEV_FRONTEND=m
>>> -CONFIG_XEN_MAX_DOMAIN_MEMORY=32
>>> +CONFIG_XEN_MAX_DOMAIN_MEMORY=70
>>>   CONFIG_XEN_SAVE_RESTORE=y
>>>   CONFIG_XEN_SCRUB_PAGES=y
>>>   CONFIG_XEN_SYS_HYPERVISOR=y
>>
>> Any thoughts on the impact this change will have on -generic and
>> -server? Perhaps we should restrict this change to the -ec2 flavour only.
>>
>> rtg
> 
> As far as I understand it, this value is only used in the xen mmu code when
> setting up domU. The comment there says, it is in that case using a page per GB.
> But as we have the virtual flavour, it probably makes sense to use it.
> 
> -Stefan
> 

Ok, so here the version 2 which only changes amd64-virtual

-Stefan
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