Am Wed, 12 Feb 2020 11:53:25 +0100 schrieb Olaf Hering <o...@aepfle.de>:
> Is there a formula to calculate that amount of extra memory, is this behavior
> documented somewhere?
With the script below, the formula may look like this:
- each vcpu needs 1MB extra memory
- each GB of a HVM domU memory needs 8MB extra memory
- each HVM domU needs 2MB extra memory
I assume these 8MB per GB is needed for the EPT page tables.
In case this extra memory is indeed some obvious static value, it would be
better to allocate it from the value specified in 'memory=' to make sure a domU
uses (almost) exactly the value that was configured.
Olaf
domU='hvm'
free_memory='125551'
for memory in {1024..102400}
do
test "$(( ${memory} % (4*1024) ))" = "0" || continue
xl destroy "${domU}" &> /dev/null
while test "`xl info | awk '/^free_memory/{print $3}'`" -lt
"${free_memory}"
do
sleep 0.2
done
xl create -q -f '/netshare/domU.cfg' "name='${domU}'"
"memory='${memory}'" "vcpus='1'"
while sleep 0.1
do
state="`xl list "${domU}" | awk "/^"${domU}'/{print $5}'`"
case "${state}" in
r?????) break ;;
?b????) break ;;
*) ;;
esac
done
actual_free_memory="`xl info | awk '/^free_memory/{print $3}'`"
domU_used_memory="$(( ${free_memory} - ${actual_free_memory} ))"
extra_memory="$(( ${domU_used_memory} - ${memory} ))"
echo "${memory}/$((${memory}/1024)) ${domU_used_memory}
${extra_memory}: $((((${memory}/1024)*8)+2))"
done
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