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Re: Actual dom0 memory much lower than dom0_mem setting
- To: Andy Smith <andy@xxxxxxxxxxxxxx>
- From: Jürgen Groß <jgross@xxxxxxxx>
- Date: Wed, 8 Apr 2026 14:48:16 +0200
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- Cc: xen-users@xxxxxxxxxxxxx
- Delivery-date: Wed, 08 Apr 2026 12:56:55 +0000
- List-id: Xen user discussion <xen-users.lists.xenproject.org>
On 08.04.26 14:10, Andy Smith wrote:
Hi Jürgen,
On Wed, Apr 08, 2026 at 09:21:48AM +0200, Jürgen Groß wrote:
On 03.04.26 17:23, Andy Smith wrote:
$ sudo xl info | grep xen_commandline
xen_commandline : placeholder dom0_mem=8192M dom0_max_vcpus=2
com1=115200,8n1,0x2f8,10 console=com1,vga ucode=scan smt=1
$ free -m
total used free shared buff/cache
available
Mem: 6285 1425 3239 126 1620 4642
Swap: 952 1 951
Is this widely know and expected?
Is it fixable?
Is it something you can calculate? ("To get 8192M usable dom0 memory I
must specify…").
Some questions:
I would assume the memory size as reported by "xl list" is the configured one?
Yes.
$ sudo xl list
Name ID Mem VCPUs State Time(s)
Domain-0 0 10429 2 r----- 42170.5
Okay, as expected.
$ sudo xl info | grep xen_commandline
xen_commandline : placeholder dom0_mem=10429M dom0_max_vcpus=2
com1=115200,8n1,0x2f8,10 console=com1,vga ucode=scan smt=1 no-real-mode edd=off
What does "cat /proc/iomem" in dom0 report?
Could you please post the output of "dmesg" after boot?
Please find attached,
You'll want to do "cat /proc/iomem" as root, as otherwise the information isn't
really usable. ;-)
Juergen
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