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Re: [Qemu-devel] balloon stats not working if qemu is started with -mach
From: |
Luiz Capitulino |
Subject: |
Re: [Qemu-devel] balloon stats not working if qemu is started with -machine option |
Date: |
Tue, 10 Mar 2015 09:30:20 -0400 |
On Mon, 9 Mar 2015 08:04:54 +0100 (CET)
Alexandre DERUMIER <address@hidden> wrote:
> I have forgot to said that we don't setup pooling interval manually. (which
> seem to works fine without -machine)
>
>
> Now,if I setup guest-stats-polling-interval with qom-set,
> it seem to works fine with -machine option.
Setting the polling interval is a required step.
The output you sent seems to indicate that the guest sent a stats update
to the host unilaterally and those values seem buggy. I can investigate
it if you provide full details (guest command-line plus full QMP
command sequence). But you do have to set the polling interval to use
the feature.
>
>
>
> ----- Mail original -----
> De: "aderumier" <address@hidden>
> À: "qemu-devel" <address@hidden>, "Luiz Capitulino" <address@hidden>
> Cc: "dietmar" <address@hidden>
> Envoyé: Lundi 9 Mars 2015 07:49:22
> Objet: [Qemu-devel] balloon stats not working if qemu is started with
> -machine option
>
> Hi,
>
> I have noticed that balloon stats are not working if a qemu guest is started
> with -machine option.
>
> (-machine pc, or any version) . Tested of qemu 1.7,2.1 && 2.2
>
>
> When the guest is starting (balloon driver not yet loaded)
>
> $VAR1 = {
> 'last-update' => 0,
> 'stats' => {
> 'stat-free-memory' => -1,
> 'stat-swap-in' => -1,
> 'stat-total-memory' => -1,
> 'stat-major-faults' => -1,
> 'stat-minor-faults' => -1,
> 'stat-swap-out' => -1
> }
> };
>
>
> then
>
> when the guest has loaded his driver
>
> $VAR1 = {
> 'last-update' => 1425882998,
> 'stats' => {
> 'stat-free-memory' => -1,
> 'stat-swap-in' => '4039065379203448832',
> 'stat-total-memory' => -1,
> 'stat-major-faults' => -1,
> 'stat-minor-faults' => -1,
> 'stat-swap-out' => '-6579759055588294656'
> }
> };
>
> $VAR1 = {
> 'last-update' => 1425882998,
> 'stats' => {
> 'stat-free-memory' => -1,
> 'stat-swap-in' => '4039065379203448832',
> 'stat-total-memory' => -1,
> 'stat-major-faults' => -1,
> 'stat-minor-faults' => -1,
> 'stat-swap-out' => '-6579759055588294656'
> }
> };
>
>
> $VAR1 = {
> 'last-update' => 1425882998,
> 'stats' => {
> 'stat-free-memory' => -1,
> 'stat-swap-in' => '4039065379203448832',
> 'stat-total-memory' => -1,
> 'stat-major-faults' => -1,
> 'stat-minor-faults' => -1,
> 'stat-swap-out' => '-6579759055588294656'
> }
> };
>
>
> It's seem that a some stats are retrieved, but last-update don't increment.
> Removing the machine option resolve the problem.
>
>
> I'm working with proxmox team, and a lot of user have reported balloning bug,
> because we pass the -machine option when are a doing live migration.
>
> I'm surprised that -machine pc also have this bug. (Isn't it supposed to be
> the default machine config ?)
>
>
>
>
> here the sample command line:
>
>
> /usr/bin/kvm -id 150 -chardev
> socket,id=qmp,path=/var/run/qemu-server/150.qmp,server,nowait -mon
> chardev=qmp,mode=control -vnc unix:/var/run/qemu-server/150.vnc,x509,password
> -pidfile /var/run/qemu-server/150.pid -daemonize -smbios
> type=1,manufacturer=dell,version=1,product=3,uuid=f0686bfb-50b8-4d31-a4cb-b1cf60eeb648
> -name debianok -smp 1,sockets=2,cores=1,maxcpus=2 -nodefaults -boot
> menu=on,strict=on,reboot-timeout=1000 -vga cirrus -cpu
> kvm64,+lahf_lm,+x2apic,+sep -m 4096 -k fr -device
> piix3-usb-uhci,id=uhci,bus=pci.0,addr=0x1.0x2 -device
> usb-tablet,id=tablet,bus=uhci.0,port=1 -device
> virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 -iscsi
> initiator-name=iqn.1993-08.org.debian.01.24b0d01a62a3 -drive
> file=/var/lib/vz/images/150/vm-150-disk-1.raw,if=none,id=drive-virtio0,format=raw,aio=native,cache=none
> -device
> virtio-blk-pci,drive=drive-virtio0,id=virtio0,bus=pci.0,addr=0xa,bootindex=100
> -netdev
> type=tap,id=net0,ifname=tap150i0,script=/var/lib/qemu-server/pve-bridge,downscript=/var/lib/qemu-server/pve-bridgedown,vhost=on
> -device
> virtio-net-pci,mac=76:EF:E9:ED:9D:41,netdev=net0,bus=pci.0,addr=0x12,id=net0,bootindex=300
> -machine pc
>