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

[Tim Gardner]

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
-- 
Tim Gardner tim.gardner at canonical.com