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kvm: improved performance on creating VM (#2923)

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Improved performance on creating VM for KVM virtualization.

On a huge hosts every "ifconfig | grep" takes a lot of time (about 2.5-3 minutes on hosts with 500 machines). For example: ip link show dev $vlanDev > /dev/null is faster than ifconfig |grep -w $vlanDev > /dev/null. But using ip command is much better. Using this patch you can create 500s machine in 10 seconds. You don't need slow ifconfig prints anymore.
This commit is contained in:
alexanderbazhenoff 2018-10-25 13:58:13 +03:00 committed by Rohit Yadav
parent 9cf57d2568
commit a87acf93d8
1 changed files with 3 additions and 11 deletions
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14
scripts/vm/network/vnet/modifyvlan.sh
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@ -48,11 +48,7 @@ addVlan() {
fi fi
# is up? # is up?
ifconfig |grep -w $vlanDev > /dev/null ip link set $vlanDev up > /dev/null 2>/dev/null
if [ $? -gt 0 ]
then
ifconfig $vlanDev up > /dev/null
fi
if [ ! -d /sys/class/net/$vlanBr ] if [ ! -d /sys/class/net/$vlanBr ]
then then
@ -86,11 +82,7 @@ addVlan() {
fi fi
fi fi
# is vlanBr up? # is vlanBr up?
ifconfig |grep -w $vlanBr > /dev/null ip link set $vlanBr up > /dev/null 2>/dev/null
if [ $? -gt 0 ]
then
ifconfig $vlanBr up
fi
return 0 return 0
} }
@ -109,7 +101,7 @@ deleteVlan() {
return 1 return 1
fi fi
ifconfig $vlanBr down ip link set $vlanBr down
if [ $? -gt 0 ] if [ $? -gt 0 ]
then then