hostpci0: .....,x-vga=on,pcie=1
x-vga require kernel 3.10 with vfio-vga support enable
if x-vga=on, we force vfio-pci device
pcie=1 choose the pciexpress bus (need q35 machine model)
Signed-off-by: Alexandre Derumier <aderumier@odiso.com>
q35 use pcie.0 root by default. so currently we can't start machine model q35.
we need to add 3 pci-bridge pci.0, pci.1, pci.2, to handle our devices.
pcie.0 does not support hotplug. so pci-bridge are defined at startup.
I use an pve-q35.cfg (mostly the same than q35-chipset.cfg from qemu docs).
Signed-off-by: Alexandre Derumier <aderumier@odiso.com>
this a new option queue=(\d+) to net interface
Allow to use more than 1 cpu for network stream, so this can improve network bandwidth,
when vhost-net cpu is the bottleneck
http://www.linux-kvm.org/page/Multiqueue#Enable_MQ_feature
-netdev tap,vhost=on,queues=N -device virtio-net-pci,mq=on,vectors=2N+2
host requirement
----------------
this require host kernel >= 3.8 (or qemu die at start)
linux guest requirement
-----------------------
kernel >= 3.8
manual enabling multiqueue
windows guest requierement
--------------------------
recent virtio-net driver
Signed-off-by: Alexandre Derumier <aderumier@odiso.com>
We simply add option iscsi if we have an initiator name. So we
never add this option multiple times, and it works with hotplug
in case someone plugs an 'iscsi:' drive later.
enable check if host support all cpu flags configured for the guests
this avoid some bad setup like Opteron vcpu on a intel host for example,
and avoid some bad live migrations
Signed-off-by: Alexandre Derumier <aderumier@odiso.com>
This reduce guest cpu speed if dirtied bytes is 50% more than the approx.amount of bytes that just got transferred since the last time we were in this routine.
qemu commit :
http://git.qemu.org/?p=qemu.git;a=commit;h=bde1e2ec2176c363c1783bf8887b6b1beb08dfee
tested with "stress -m 2 -c 2" under debian
without autoconvergence : downtime 12s - duration 12min
with autoconvergence : downtime 2s - duration 4min
Signed-off-by: Alexandre Derumier <aderumier@odiso.com>
