Hi Mélodie,
It's not true that "the ZRAM swap device will be used only if needed."
The zram swap device must be pre-allocated, and (of course) takes away
from system memory. If the total memory needed by the live system is
less than the amount of physical ram, but more than ($physical_ram -
$zram_size), enabling zram will result in a performance penalty for
memory access because of the added overhead of compression.
So it's by design that we only enable zram in cases where we know we
need more RAM than we have available, and when we know we won't have
swap.
** Changed in: initramfs-tools (Ubuntu)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/1095154
Title:
initramfs-tools: ZRAM is not used in Live CD's if the machine has
more than 512 MB RAM
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