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[Qemu-devel] [Bug 1801933] Re: default memory parameter too small on x86
[Qemu-devel] [Bug 1801933] Re: default memory parameter too small on x86_64 today
Wed, 05 Dec 2018 11:20:38 -0000
IMHO, if achieving ease of use comparable to VirtualBox is your
benchmark target, then launching QEMU directly is really the wrong way
to approach things. QEMU is a very low level piece of infrastructure not
a complete end user desktop solution. For that it is better to look at
using an application such as virt-manager, or GNOME Boxes. These provide
higher level solution over QEMU and do smart things during installation,
using libosinfo to automatically determine the best memory, disk,
network, etc settings for each particular guest OS rather than relying
on some hardcoded defaults.
That said all said, I don't rule out that we could change our memory
defaults, but picking an optimal value is hard. Even 500 MB is
considered to be unsupported from a RHEL-7 pov - the documented minimum
for RHEL-7 is 1 GB per vCPU. The installer is quite likely to crash with
500 MB depending on what options you select durin intsall.
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default memory parameter too small on x86_64 today
Status in QEMU:
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
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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