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[Bug 1801933] Re: default memory parameter too small on x86_64 today

From: Thomas Huth
Subject: [Bug 1801933] Re: default memory parameter too small on x86_64 today
Date: Mon, 23 Nov 2020 08:56:01 -0000

** Changed in: qemu
   Importance: Undecided => Wishlist

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  default memory parameter too small on x86_64 today

Status in QEMU:

Bug description:
  Launching a centos74 iso VM today does not work anymore on x86_64
  without increasing the size of the memory parameter. For example with
  this command :

  $ /opt/qemu-3.0.0/bin/qemu-system-x86_64 --curses   -enable-kvm -drive
  file=file.dd,index=0,media=disk -drive file=centos-

  [    3.047614] Failed to execute /init
  [    3.048315] Kernel panic - not syncing: No init found.  Try passing init= 
option to kernel. See Linux Documentation/init.txt for guidance.
  [    3.049258] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 

  Increasing the size from the default 128MiB to 512MiB let the VM works 
without problem.
  So, ok, it's not a qemu problem, it's more a "User problem" and interface 
problem for me.
  But it push me in the end to launch VirtualBox instead of qemu, because the 
default parameter does not work anymore... And I had no time to investigate why 
it does not work because the message is not visible.
  Debian iso with the same command line for example show a message to tell me 
that there is not enough memory, so it help me to track the real issue behind.

  But... In the end, I think today, the default memory parameter on x86_64 is 
too small and it can lead some people like me to switch to VirtualBox.
  VirtualBox, in the wizard is set by default to 4MiB Ram size, which tell 
you... Ok I need to put more. And, you know that 4MiB is not enough in the end.



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