Re: xilinx-zynq-a9: cannot set up guest memory 'zynq.ext_ram'

[David Hildenbrand]

On 20.08.21 16:22, Bin Meng wrote:
> Hi Philippe,
>
> On Fri, Aug 20, 2021 at 10:10 PM Philippe Mathieu-Daudé
> <philmd@redhat.com> wrote:
> > Hi Bin,
> >
> > On 8/20/21 4:04 PM, Bin Meng wrote:
> > > Hi,
> > >
> > > The following command used to work on QEMU 4.2.0, but is now broken
> > > with QEMU head.
> > >
> > > $ qemu-system-arm -M xilinx-zynq-a9 -display none -m 40000000
> > > -nographic -serial /dev/null -serial mon:stdio -monitor null -device
> > > loader,file=u-boot-dtb.bin,addr=0x4000000,cpu-num=0
> > > qemu-system-arm: cannot set up guest memory 'zynq.ext_ram': Cannot
> > > allocate memory
> > >
> > > Any ideas?
> >
> > Richard hit that recently too.
>
> I hit this when in the VM on Azure pipelines, but I was able to
> reproduce this issue on my local machine.
>
> > Can you provide:
> >
> > cat /proc/sys/vm/overcommit_kbytes
> > cat /proc/sys/vm/overcommit_memory
> > cat /proc/sys/vm/overcommit_ratio
>
> $ cat /proc/sys/vm/overcommit_kbytes
> 0
> $ cat /proc/sys/vm/overcommit_memory
> 0
> $ cat /proc/sys/vm/overcommit_ratio
> 50
>
> > and
> >
> > cat /proc/meminfo
> >
> > (CommitLimit, Committed_AS)
>
> $ cat /proc/meminfo
>
> CommitLimit:    12388820 kB
> Committed_AS:    5019088 kB
>
> > and OOM messages.
>
> I did not see any OOM messages.

-m 40000000

corresponds to 38 TB if I am not wrong. Is that really what you want?

How much main memory does your system have?

--
Thanks,

David / dhildenb