Re: [Xen-devel] Possible regression: XEN 4.0.0 total_memory decrease

[Alex Williams <awilliams@xxxxxxxx>]

Hi,

I also want to add, my build process is practically automated. The only 
difference I had to make for 4.0.0 was:
- Install Debian package dependencies: uuid-dev iasl gcc-multilib

Let me know if you need more information.

Thanks.


Alex Williams wrote:
> 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 -> 
> 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 
> 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 
> 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 message
> > "System RAM: xxx" early during boot. Do these differ significantly for 
> > you
> > between 3.4.2 and 4.0.0?
> >
> >  K.
> >
> > On 15/04/2010 16:54, "Alex Williams" <awilliams@xxxxxxxx> wrote:
> >
> > > 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 = 4096MB RAM
> > > XEN 3.4.2 + kernel 2.6.18: xm info | grep total_memory = 4084
> > > XEN 4.0.0 + kernel 2.6.18: xm info | grep total_memory = 3946
> > >
> > > The exact same kernel config file was used for both builds. I also made
> > > 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 on
> > > how to correct this?
> > >
> > > Thanks.
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
--
Alexander Williams
IT Architecture Specialist
Spécialiste de l'Architecture TI
http://www.iWeb.com/

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