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Re: [Xen-users] strange xen memory calculations?

To: "Sebastian Reitenbach" <sebastia@xxxxxxxxxxxxxxxxxxxx>

From: "trilok nuwal" <tc.nuwal@xxxxxxxxx>

Date: Fri, 25 Jan 2008 18:30:48 +0530

Delivery-date: Fri, 25 Jan 2008 05:01:53 -0800

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List-id: Xen user discussion <xen-users.lists.xensource.com>

On Jan 25, 2008 6:02 PM, Sebastian Reitenbach < sebastia@xxxxxxxxxxxxxxxxxxxx> wrote:

Hi,

I have started the xen kernel with parameter dom0_mem=300M.

xm info | grep total
total_memory : 2045

Name ID Mem VCPUs State Time(s)
Domain-0 0 300 2 r----- 292.1
FTP 822 1 56.7
LDAP 1 822 1 r----- 541.3
NFS1 822 1 14.8
NFS2 822 1 1.4

For the domU's I have 822 mb configured, the first runs, when I want to
start a second domU, then xend bails out because of missing memory:

xm create /etc/xen/vm/NFSPUBLIC
Using config file "/etc/xen/vm/NFSPUBLIC".
Error: I need 841728 KiB, but dom0_min_mem is 65536 and shrinking to 65536
KiB would leave only 302336 KiB free.

I know for all four domU's I do not have enough memory, but for two, it
should work:

300 + 2*822 = 1944 < 2045
I don't understand why xend thinks it needs the memory, how is this
calculated? I also set dom0_min_mem to 0 to stop ballooning at all, but that
did not helped either.

I am on sles10sp1 x86_64, using xen-3.0.4, the version that comes with the
system.

any hint is highly appreciated.
Sebastian

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