From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alex Williams <awilliams@iweb.com>
Subject: Re: Possible regression: XEN 4.0.0 total_memory decrease
Date: Thu, 15 Apr 2010 13:33:09 -0400
Message-ID: <4BC74DD5.3020809@iweb.com>
References: <C7ECFE6F.116A2%keir.fraser@eu.citrix.com>
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To: Keir Fraser <keir.fraser@eu.citrix.com>
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Hello,

Both builds run a 64-bit Xen kernel and 64-bit Dom0 kernel.

(XEN)  Xen  kernel: 64-bit, lsb, compat32
(XEN)  Dom0 kernel: 64-bit, lsb, paddr 0xffffffff80200000 ->=20
0xffffffff805d388c

As for the RAM:

Xen 3.4.2: (XEN) System RAM: 3946MB (4041012kB)
Xen 4.0.0: (XEN) System RAM: 4084MB (4182064kB)

I have also verified with only 2048MB installed in the system. Here are=20
the results:

Xen 3.4.2: (XEN) System RAM: 2036MB (2084912kB)
Xen 4.0.0: (XEN) System RAM: 1898MB (1943860kB)

Still 150MB RAM missing... it appears this problem is static and=20
independant of the amount of RAM installed in the system.

Regards,



Keir Fraser wrote:
> Are the hypervisor and dom0 kernel 64-bit or 32-bit? Xen prints a messa=
ge
> "System RAM: xxx" early during boot. Do these differ significantly for =
you
> between 3.4.2 and 4.0.0?
>=20
>  K.
>=20
> On 15/04/2010 16:54, "Alex Williams" <awilliams@iweb.com> wrote:
>=20
>> Hello,
>>
>> I noticed a significant *decrease* (150MB) in "total_memory" on a host
>> build using XEN 4.0.0 with kernel 2.6.18.
>>
>> Here are the details:
>>
>> Server =3D 4096MB RAM
>> XEN 3.4.2 + kernel 2.6.18: xm info | grep total_memory =3D 4084
>> XEN 4.0.0 + kernel 2.6.18: xm info | grep total_memory =3D 3946
>>
>> The exact same kernel config file was used for both builds. I also mad=
e
>> sure there is absolutely no difference on the hosts (while the builds
>> are created on a different machine).
>>
>> This seems like a regression, unless someone can provide suggestions o=
n
>> how to correct this?
>>
>> Thanks.
>>
>=20
>=20
>=20
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
>=20

--=20
Alexander Williams
IT Architecture Specialist
Sp=E9cialiste de l'Architecture TI
http://www.iWeb.com/