* qemu process consumes 100% host CPU after reverting snapshot
@ 2024-03-27 23:32 Chun Feng Wu
2024-03-28 10:50 ` Chun Feng Wu
0 siblings, 1 reply; 3+ messages in thread
From: Chun Feng Wu @ 2024-03-27 23:32 UTC (permalink / raw)
To: qemu-devel
[-- Attachment #1: Type: text/plain, Size: 6441 bytes --]
Hi,
I am testing throttle filter chain(multiple throttle-groups on disk)
with the following steps:
1. start guest vm(chained throttle filters applied on disk per
https://github.com/qemu/qemu/blob/master/docs/throttle.txt)
2. take snapshot
3. revert snapshot
after step3, I noticed qemu process in host consumes 100% cpu, and after
I login guest vm, vm cannot(or slowly) response my cmd (it works well
before reverting).
/ PID USER PR NI VIRT RES SHR S %CPU
%MEM TIME+ COMMAND
65455 root 20 0 9659924 891328 20132 R 100.3 5.4 29:39.93
qemu-system-x86/
/
/
Does anybody know why such issue happens? is it a bug or I
misunderstand something?
my cmd:
/qemu-system-x86_64 \
-name ubuntu-20.04-vm,debug-threads=on \
-machine pc-i440fx-jammy,usb=off,dump-guest-core=off \
-accel kvm \
-cpu
Broadwell-IBRS,vme=on,ss=on,vmx=on,f16c=on,rdrand=on,hypervisor=on,arat=on,tsc-adjust=on,md-clear=on,stibp=on,ssbd=on,xsaveopt=on,pdpe1gb=on,abm=on,tsx-ctrl=off,hle=off,rtm=off
\
-m 8192 \
-overcommit mem-lock=off \
-smp 2,sockets=1,dies=1,cores=1,threads=2 \
-numa node,nodeid=0,cpus=0-1,memdev=ram \
-object memory-backend-ram,id=ram,size=8192M \
-uuid d2d68f5d-bff0-4167-bbc3-643e3566b8fb \
-display none \
-nodefaults \
-monitor stdio \
-rtc base=utc,driftfix=slew \
-no-shutdown \
-boot strict=on \
-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 \
-object
'{"qom-type":"throttle-group","id":"limit0","limits":{"bps-total":0,"bps-read":0,"bps-write":0,"iops-total":200,"iops-read":0,"iops-write":0,"bps-total-max":0,"bps-read-max":0,"bps-write-max":0,"iops-total-max":200,"iops-read-max":0,"iops-write-max":0,"iops-size":0,"bps-total-max-length":1,"bps-read-max-length":1,"bps-write-max-length":1,"iops-total-max-length":1,"iops-read-max-length":1,"iops-write-max-length":1}}'
\
-object
'{"qom-type":"throttle-group","id":"limit1","limits":{"bps-total":0,"bps-read":0,"bps-write":0,"iops-total":250,"iops-read":0,"iops-write":0,"bps-total-max":0,"bps-read-max":0,"bps-write-max":0,"iops-total-max":250,"iops-read-max":0,"iops-write-max":0,"iops-size":0,"bps-total-max-length":1,"bps-read-max-length":1,"bps-write-max-length":1,"iops-total-max-length":1,"iops-read-max-length":1,"iops-write-max-length":1}}'
\
-object
'{"qom-type":"throttle-group","id":"limit2","limits":{"bps-total":0,"bps-read":0,"bps-write":0,"iops-total":300,"iops-read":0,"iops-write":0,"bps-total-max":0,"bps-read-max":0,"bps-write-max":0,"iops-total-max":300,"iops-read-max":0,"iops-write-max":0,"iops-size":0,"bps-total-max-length":1,"bps-read-max-length":1,"bps-write-max-length":1,"iops-total-max-length":1,"iops-read-max-length":1,"iops-write-max-length":1}}'
\
-object
'{"qom-type":"throttle-group","id":"limit012","limits":{"bps-total":0,"bps-read":0,"bps-write":0,"iops-total":400,"iops-read":0,"iops-write":0,"bps-total-max":0,"bps-read-max":0,"bps-write-max":0,"iops-total-max":400,"iops-read-max":0,"iops-write-max":0,"iops-size":0,"bps-total-max-length":1,"bps-read-max-length":1,"bps-write-max-length":1,"iops-total-max-length":1,"iops-read-max-length":1,"iops-write-max-length":1}}'
\
-blockdev
'{"driver":"file","filename":"/virt/images/focal-server-cloudimg-amd64.img","node-name":"libvirt-4-storage","auto-read-only":true,"discard":"unmap"}'
\
-blockdev
'{"node-name":"libvirt-4-format","read-only":false,"driver":"qcow2","file":"libvirt-4-storage","backing":null}'
\
-device
virtio-blk-pci,bus=pci.0,addr=0x4,drive=libvirt-4-format,id=virtio-disk0,bootindex=1
\
-blockdev
'{"driver":"file","filename":"/virt/disks/vm1_disk_1.qcow2","node-name":"libvirt-3-storage","auto-read-only":true,"discard":"unmap"}'
\
-blockdev
'{"node-name":"libvirt-3-format","read-only":false,"driver":"qcow2","file":"libvirt-3-storage","backing":null}'
\
-blockdev
'{"driver":"throttle","node-name":"libvirt-5-filter","throttle-group":"limit0","file":"libvirt-3-format"}'
\
-blockdev
'{"driver":"throttle","node-name":"libvirt-6-filter","throttle-group":"limit012","file":"libvirt-5-filter"}'
\
-device
virtio-blk-pci,bus=pci.0,addr=0x5,drive=libvirt-6-filter,id=virtio-disk1 \
-blockdev
'{"driver":"file","filename":"/virt/disks/vm1_disk_2.qcow2","node-name":"libvirt-2-storage","auto-read-only":true,"discard":"unmap"}'
\
-blockdev
'{"node-name":"libvirt-2-format","read-only":false,"driver":"qcow2","file":"libvirt-2-storage","backing":null}'
\
-blockdev
'{"driver":"throttle","node-name":"libvirt-3-filter","throttle-group":"limit1","file":"libvirt-2-format"}'
\
-blockdev
'{"driver":"throttle","node-name":"libvirt-4-filter","throttle-group":"limit012","file":"libvirt-3-filter"}'
\
-device
virtio-blk-pci,bus=pci.0,addr=0x6,drive=libvirt-4-filter,id=virtio-disk2 \
-blockdev
'{"driver":"file","filename":"/virt/disks/vm1_disk_3.qcow2","node-name":"libvirt-1-storage","auto-read-only":true,"discard":"unmap"}'
\
-blockdev
'{"node-name":"libvirt-1-format","read-only":false,"driver":"qcow2","file":"libvirt-1-storage","backing":null}'
\
-blockdev
'{"driver":"throttle","node-name":"libvirt-1-filter","throttle-group":"limit2","file":"libvirt-1-format"}'
\
-blockdev
'{"driver":"throttle","node-name":"libvirt-2-filter","throttle-group":"limit012","file":"libvirt-1-filter"}'
\
-device
virtio-blk-pci,bus=pci.0,addr=0x7,drive=libvirt-2-filter,id=virtio-disk3 \
-netdev user,id=user0,hostfwd=tcp::2222-:22 \
-device
virtio-net-pci,netdev=user0,id=net0,mac=52:54:00:12:34:56,bus=pci.0,addr=0x3
\
-chardev pty,id=charserial0 \
-device isa-serial,chardev=charserial0,id=serial0,index=0 \
-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x2 \
-sandbox
on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
-msg timestamp=on/
snapshot and reverting:
/(qemu) info status
VM status: running
(qemu) savevm snapshot1
(qemu) loadvm snapshot1/
my env:
/:~# qemu-system-x86_64 --version
QEMU emulator version 6.2.0 (Debian 1:6.2+dfsg-2ubuntu6.17)
Copyright (c) 2003-2021 Fabrice Bellard and the QEMU Project developers
:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 22.04.4 LTS
Release: 22.04
Codename: jammy/
--
Thanks and Regards,
Wu
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: qemu process consumes 100% host CPU after reverting snapshot
2024-03-27 23:32 qemu process consumes 100% host CPU after reverting snapshot Chun Feng Wu
@ 2024-03-28 10:50 ` Chun Feng Wu
2024-04-01 5:05 ` Dongli Zhang
0 siblings, 1 reply; 3+ messages in thread
From: Chun Feng Wu @ 2024-03-28 10:50 UTC (permalink / raw)
To: qemu-devel
[-- Attachment #1: Type: text/plain, Size: 7230 bytes --]
BTW, if I download qemu8.0(https://download.qemu.org/qemu-8.0.0.tar.xz),
compile and install it in my ubuntu22.04, launch vm with the same
command(just update --machine to be "pc"), the host cpu usage is not
high, it seems to be a bug in QEMU6
Also, I have another question, for disk iotune or throttle group, after
reverting snapshot, if I login vm, and run fio, I/O performance drops a
lot in both QEMU6 and QEMU8, do anyone know the reason? Any explanation
would be appreciated!
On 2024/3/28 07:32, Chun Feng Wu wrote:
>
> Hi,
>
> I am testing throttle filter chain(multiple throttle-groups on disk)
> with the following steps:
> 1. start guest vm(chained throttle filters applied on disk per
> https://github.com/qemu/qemu/blob/master/docs/throttle.txt)
> 2. take snapshot
> 3. revert snapshot
>
> after step3, I noticed qemu process in host consumes 100% cpu, and
> after I login guest vm, vm cannot(or slowly) response my cmd (it works
> well before reverting).
>
> / PID USER PR NI VIRT RES SHR S %CPU
> %MEM TIME+ COMMAND
> 65455 root 20 0 9659924 891328 20132 R 100.3 5.4
> 29:39.93 qemu-system-x86/
>
> /
> /
>
> Does anybody know why such issue happens? is it a bug or I
> misunderstand something?
>
> my cmd:
>
> /qemu-system-x86_64 \
> -name ubuntu-20.04-vm,debug-threads=on \
> -machine pc-i440fx-jammy,usb=off,dump-guest-core=off \
> -accel kvm \
> -cpu
> Broadwell-IBRS,vme=on,ss=on,vmx=on,f16c=on,rdrand=on,hypervisor=on,arat=on,tsc-adjust=on,md-clear=on,stibp=on,ssbd=on,xsaveopt=on,pdpe1gb=on,abm=on,tsx-ctrl=off,hle=off,rtm=off
> \
> -m 8192 \
> -overcommit mem-lock=off \
> -smp 2,sockets=1,dies=1,cores=1,threads=2 \
> -numa node,nodeid=0,cpus=0-1,memdev=ram \
> -object memory-backend-ram,id=ram,size=8192M \
> -uuid d2d68f5d-bff0-4167-bbc3-643e3566b8fb \
> -display none \
> -nodefaults \
> -monitor stdio \
> -rtc base=utc,driftfix=slew \
> -no-shutdown \
> -boot strict=on \
> -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 \
> -object
> '{"qom-type":"throttle-group","id":"limit0","limits":{"bps-total":0,"bps-read":0,"bps-write":0,"iops-total":200,"iops-read":0,"iops-write":0,"bps-total-max":0,"bps-read-max":0,"bps-write-max":0,"iops-total-max":200,"iops-read-max":0,"iops-write-max":0,"iops-size":0,"bps-total-max-length":1,"bps-read-max-length":1,"bps-write-max-length":1,"iops-total-max-length":1,"iops-read-max-length":1,"iops-write-max-length":1}}'
> \
> -object
> '{"qom-type":"throttle-group","id":"limit1","limits":{"bps-total":0,"bps-read":0,"bps-write":0,"iops-total":250,"iops-read":0,"iops-write":0,"bps-total-max":0,"bps-read-max":0,"bps-write-max":0,"iops-total-max":250,"iops-read-max":0,"iops-write-max":0,"iops-size":0,"bps-total-max-length":1,"bps-read-max-length":1,"bps-write-max-length":1,"iops-total-max-length":1,"iops-read-max-length":1,"iops-write-max-length":1}}'
> \
> -object
> '{"qom-type":"throttle-group","id":"limit2","limits":{"bps-total":0,"bps-read":0,"bps-write":0,"iops-total":300,"iops-read":0,"iops-write":0,"bps-total-max":0,"bps-read-max":0,"bps-write-max":0,"iops-total-max":300,"iops-read-max":0,"iops-write-max":0,"iops-size":0,"bps-total-max-length":1,"bps-read-max-length":1,"bps-write-max-length":1,"iops-total-max-length":1,"iops-read-max-length":1,"iops-write-max-length":1}}'
> \
> -object
> '{"qom-type":"throttle-group","id":"limit012","limits":{"bps-total":0,"bps-read":0,"bps-write":0,"iops-total":400,"iops-read":0,"iops-write":0,"bps-total-max":0,"bps-read-max":0,"bps-write-max":0,"iops-total-max":400,"iops-read-max":0,"iops-write-max":0,"iops-size":0,"bps-total-max-length":1,"bps-read-max-length":1,"bps-write-max-length":1,"iops-total-max-length":1,"iops-read-max-length":1,"iops-write-max-length":1}}'
> \
> -blockdev
> '{"driver":"file","filename":"/virt/images/focal-server-cloudimg-amd64.img","node-name":"libvirt-4-storage","auto-read-only":true,"discard":"unmap"}'
> \
> -blockdev
> '{"node-name":"libvirt-4-format","read-only":false,"driver":"qcow2","file":"libvirt-4-storage","backing":null}'
> \
> -device
> virtio-blk-pci,bus=pci.0,addr=0x4,drive=libvirt-4-format,id=virtio-disk0,bootindex=1
> \
> -blockdev
> '{"driver":"file","filename":"/virt/disks/vm1_disk_1.qcow2","node-name":"libvirt-3-storage","auto-read-only":true,"discard":"unmap"}'
> \
> -blockdev
> '{"node-name":"libvirt-3-format","read-only":false,"driver":"qcow2","file":"libvirt-3-storage","backing":null}'
> \
> -blockdev
> '{"driver":"throttle","node-name":"libvirt-5-filter","throttle-group":"limit0","file":"libvirt-3-format"}'
> \
> -blockdev
> '{"driver":"throttle","node-name":"libvirt-6-filter","throttle-group":"limit012","file":"libvirt-5-filter"}'
> \
> -device
> virtio-blk-pci,bus=pci.0,addr=0x5,drive=libvirt-6-filter,id=virtio-disk1 \
> -blockdev
> '{"driver":"file","filename":"/virt/disks/vm1_disk_2.qcow2","node-name":"libvirt-2-storage","auto-read-only":true,"discard":"unmap"}'
> \
> -blockdev
> '{"node-name":"libvirt-2-format","read-only":false,"driver":"qcow2","file":"libvirt-2-storage","backing":null}'
> \
> -blockdev
> '{"driver":"throttle","node-name":"libvirt-3-filter","throttle-group":"limit1","file":"libvirt-2-format"}'
> \
> -blockdev
> '{"driver":"throttle","node-name":"libvirt-4-filter","throttle-group":"limit012","file":"libvirt-3-filter"}'
> \
> -device
> virtio-blk-pci,bus=pci.0,addr=0x6,drive=libvirt-4-filter,id=virtio-disk2 \
> -blockdev
> '{"driver":"file","filename":"/virt/disks/vm1_disk_3.qcow2","node-name":"libvirt-1-storage","auto-read-only":true,"discard":"unmap"}'
> \
> -blockdev
> '{"node-name":"libvirt-1-format","read-only":false,"driver":"qcow2","file":"libvirt-1-storage","backing":null}'
> \
> -blockdev
> '{"driver":"throttle","node-name":"libvirt-1-filter","throttle-group":"limit2","file":"libvirt-1-format"}'
> \
> -blockdev
> '{"driver":"throttle","node-name":"libvirt-2-filter","throttle-group":"limit012","file":"libvirt-1-filter"}'
> \
> -device
> virtio-blk-pci,bus=pci.0,addr=0x7,drive=libvirt-2-filter,id=virtio-disk3 \
> -netdev user,id=user0,hostfwd=tcp::2222-:22 \
> -device
> virtio-net-pci,netdev=user0,id=net0,mac=52:54:00:12:34:56,bus=pci.0,addr=0x3
> \
> -chardev pty,id=charserial0 \
> -device isa-serial,chardev=charserial0,id=serial0,index=0 \
> -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x2 \
> -sandbox
> on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
> -msg timestamp=on/
>
>
> snapshot and reverting:
>
> /(qemu) info status
> VM status: running
> (qemu) savevm snapshot1
> (qemu) loadvm snapshot1/
>
>
> my env:
> /:~# qemu-system-x86_64 --version
> QEMU emulator version 6.2.0 (Debian 1:6.2+dfsg-2ubuntu6.17)
> Copyright (c) 2003-2021 Fabrice Bellard and the QEMU Project developers
>
> :~# lsb_release -a
> No LSB modules are available.
> Distributor ID: Ubuntu
> Description: Ubuntu 22.04.4 LTS
> Release: 22.04
> Codename: jammy/
>
> --
> Thanks and Regards,
>
> Wu
--
Thanks and Regards,
Wu
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: qemu process consumes 100% host CPU after reverting snapshot
2024-03-28 10:50 ` Chun Feng Wu
@ 2024-04-01 5:05 ` Dongli Zhang
0 siblings, 0 replies; 3+ messages in thread
From: Dongli Zhang @ 2024-04-01 5:05 UTC (permalink / raw)
To: Chun Feng Wu, qemu-devel
To share my test result, I do NOT reproduce the issue with the below command
line and QEMU-8.2.
However, I can reproduce with QEMU-6.2. The mainloop consumes 100% CPU usage.
qemu-system-x86_64 \
--enable-kvm -cpu host -smp 2 -m 8G \
-object
throttle-group,id=limit0,x-iops-total=200,x-iops-total-max=200,x-bps-total-max-length=1,x-bps-read-max-length=1,x-bps-write-max-length=1,x-iops-total-max-length=1,x-iops-read-max-length=1,x-iops-write-max-length=1
\
-object
throttle-group,id=limit1,x-iops-total=250,x-iops-total-max=250,x-bps-total-max-length=1,x-bps-read-max-length=1,x-bps-write-max-length=1,x-iops-total-max-length=1,x-iops-read-max-length=1,x-iops-write-max-length=1
\
-object
throttle-group,id=limit2,x-iops-total=300,x-iops-total-max=300,x-bps-total-max-length=1,x-bps-read-max-length=1,x-bps-write-max-length=1,x-iops-total-max-length=1,x-iops-read-max-length=1,x-iops-write-max-length=1
\
-object
throttle-group,id=limit012,x-iops-total=400,x-iops-total-max=400,x-bps-total-max-length=1,x-bps-read-max-length=1,x-bps-write-max-length=1,x-iops-total-max-length=1,x-iops-read-max-length=1,x-iops-write-max-length=1
\
-device
virtio-blk-pci,bus=pci.0,addr=0x4,drive=libvirt-4-format,id=virtio-disk0,bootindex=1
\
-blockdev
driver=file,filename=image.qcow2,node-name=libvirt-4-storage,discard=unmap \
-blockdev node-name=libvirt-4-format,driver=qcow2,file=libvirt-4-storage \
-device virtio-blk-pci,bus=pci.0,addr=0x5,drive=libvirt-6-filter,id=virtio-disk1 \
-blockdev
driver=file,filename=test01.qcow2,node-name=libvirt-3-storage,discard=unmap \
-blockdev node-name=libvirt-3-format,driver=qcow2,file=libvirt-3-storage \
-blockdev
driver=throttle,node-name=libvirt-5-filter,throttle-group=limit0,file=libvirt-3-format
\
-blockdev
driver=throttle,node-name=libvirt-6-filter,throttle-group=limit012,file=libvirt-5-filter
\
-device virtio-blk-pci,bus=pci.0,addr=0x6,drive=libvirt-4-filter,id=virtio-disk2 \
-blockdev
driver=file,filename=test02.qcow2,node-name=libvirt-2-storage,discard=unmap \
-blockdev node-name=libvirt-2-format,driver=qcow2,file=libvirt-2-storage \
-blockdev
driver=throttle,node-name=libvirt-3-filter,throttle-group=limit1,file=libvirt-2-format
\
-blockdev
driver=throttle,node-name=libvirt-4-filter,throttle-group=limit012,file=libvirt-3-filter
\
-device virtio-blk-pci,bus=pci.0,addr=0x7,drive=libvirt-2-filter,id=virtio-disk3 \
-blockdev
driver=file,filename=test03.qcow2,node-name=libvirt-1-storage,discard=unmap \
-blockdev node-name=libvirt-1-format,driver=qcow2,file=libvirt-1-storage \
-blockdev
driver=throttle,node-name=libvirt-1-filter,throttle-group=limit2,file=libvirt-1-format
\
-blockdev
driver=throttle,node-name=libvirt-2-filter,throttle-group=limit012,file=libvirt-1-filter
\
-netdev user,id=user0,hostfwd=tcp::5028-:22 \
-device
virtio-net-pci,netdev=user0,id=net0,mac=52:54:00:12:34:56,bus=pci.0,addr=0x3 \
-monitor stdio
(qemu) info status
(qemu) savevm snapshot1
(qemu) loadvm snapshot1
Dongli Zhang
On 3/28/24 03:50, Chun Feng Wu wrote:
> BTW, if I download
> qemu8.0(https://urldefense.com/v3/__https://download.qemu.org/qemu-8.0.0.tar.xz__;!!ACWV5N9M2RV99hQ!ObhT3ZYGr8GQFt4p7dWc-t-CFeKff1UzyRPc9WQrAuhz1B7jDC1-VTqjoCUDcrhXsffyBQuRtnoZhfZhS8FVig$ ), compile and install it in my ubuntu22.04, launch vm with the same command(just update --machine to be "pc"), the host cpu usage is not high, it seems to be a bug in QEMU6
>
> Also, I have another question, for disk iotune or throttle group, after
> reverting snapshot, if I login vm, and run fio, I/O performance drops a lot in
> both QEMU6 and QEMU8, do anyone know the reason? Any explanation would be
> appreciated!
>
>
>
> On 2024/3/28 07:32, Chun Feng Wu wrote:
>>
>> Hi,
>>
>> I am testing throttle filter chain(multiple throttle-groups on disk) with the
>> following steps:
>> 1. start guest vm(chained throttle filters applied on disk per
>> https://urldefense.com/v3/__https://github.com/qemu/qemu/blob/master/docs/throttle.txt__;!!ACWV5N9M2RV99hQ!ObhT3ZYGr8GQFt4p7dWc-t-CFeKff1UzyRPc9WQrAuhz1B7jDC1-VTqjoCUDcrhXsffyBQuRtnoZhfaQOXc8pg$ )
>> 2. take snapshot
>> 3. revert snapshot
>>
>> after step3, I noticed qemu process in host consumes 100% cpu, and after I
>> login guest vm, vm cannot(or slowly) response my cmd (it works well before
>> reverting).
>>
>> / PID USER PR NI VIRT RES SHR S %CPU %MEM
>> TIME+ COMMAND
>> 65455 root 20 0 9659924 891328 20132 R 100.3 5.4 29:39.93
>> qemu-system-x86/
>>
>> /
>> /
>>
>> Does anybody know why such issue happens? is it a bug or I misunderstand
>> something?
>>
>> my cmd:
>>
>> /qemu-system-x86_64 \
>> -name ubuntu-20.04-vm,debug-threads=on \
>> -machine pc-i440fx-jammy,usb=off,dump-guest-core=off \
>> -accel kvm \
>> -cpu
>> Broadwell-IBRS,vme=on,ss=on,vmx=on,f16c=on,rdrand=on,hypervisor=on,arat=on,tsc-adjust=on,md-clear=on,stibp=on,ssbd=on,xsaveopt=on,pdpe1gb=on,abm=on,tsx-ctrl=off,hle=off,rtm=off \
>> -m 8192 \
>> -overcommit mem-lock=off \
>> -smp 2,sockets=1,dies=1,cores=1,threads=2 \
>> -numa node,nodeid=0,cpus=0-1,memdev=ram \
>> -object memory-backend-ram,id=ram,size=8192M \
>> -uuid d2d68f5d-bff0-4167-bbc3-643e3566b8fb \
>> -display none \
>> -nodefaults \
>> -monitor stdio \
>> -rtc base=utc,driftfix=slew \
>> -no-shutdown \
>> -boot strict=on \
>> -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 \
>> -object
>> '{"qom-type":"throttle-group","id":"limit0","limits":{"bps-total":0,"bps-read":0,"bps-write":0,"iops-total":200,"iops-read":0,"iops-write":0,"bps-total-max":0,"bps-read-max":0,"bps-write-max":0,"iops-total-max":200,"iops-read-max":0,"iops-write-max":0,"iops-size":0,"bps-total-max-length":1,"bps-read-max-length":1,"bps-write-max-length":1,"iops-total-max-length":1,"iops-read-max-length":1,"iops-write-max-length":1}}' \
>> -object
>> '{"qom-type":"throttle-group","id":"limit1","limits":{"bps-total":0,"bps-read":0,"bps-write":0,"iops-total":250,"iops-read":0,"iops-write":0,"bps-total-max":0,"bps-read-max":0,"bps-write-max":0,"iops-total-max":250,"iops-read-max":0,"iops-write-max":0,"iops-size":0,"bps-total-max-length":1,"bps-read-max-length":1,"bps-write-max-length":1,"iops-total-max-length":1,"iops-read-max-length":1,"iops-write-max-length":1}}' \
>> -object
>> '{"qom-type":"throttle-group","id":"limit2","limits":{"bps-total":0,"bps-read":0,"bps-write":0,"iops-total":300,"iops-read":0,"iops-write":0,"bps-total-max":0,"bps-read-max":0,"bps-write-max":0,"iops-total-max":300,"iops-read-max":0,"iops-write-max":0,"iops-size":0,"bps-total-max-length":1,"bps-read-max-length":1,"bps-write-max-length":1,"iops-total-max-length":1,"iops-read-max-length":1,"iops-write-max-length":1}}' \
>> -object
>> '{"qom-type":"throttle-group","id":"limit012","limits":{"bps-total":0,"bps-read":0,"bps-write":0,"iops-total":400,"iops-read":0,"iops-write":0,"bps-total-max":0,"bps-read-max":0,"bps-write-max":0,"iops-total-max":400,"iops-read-max":0,"iops-write-max":0,"iops-size":0,"bps-total-max-length":1,"bps-read-max-length":1,"bps-write-max-length":1,"iops-total-max-length":1,"iops-read-max-length":1,"iops-write-max-length":1}}' \
>> -blockdev
>> '{"driver":"file","filename":"/virt/images/focal-server-cloudimg-amd64.img","node-name":"libvirt-4-storage","auto-read-only":true,"discard":"unmap"}' \
>> -blockdev
>> '{"node-name":"libvirt-4-format","read-only":false,"driver":"qcow2","file":"libvirt-4-storage","backing":null}' \
>> -device
>> virtio-blk-pci,bus=pci.0,addr=0x4,drive=libvirt-4-format,id=virtio-disk0,bootindex=1 \
>> -blockdev
>> '{"driver":"file","filename":"/virt/disks/vm1_disk_1.qcow2","node-name":"libvirt-3-storage","auto-read-only":true,"discard":"unmap"}' \
>> -blockdev
>> '{"node-name":"libvirt-3-format","read-only":false,"driver":"qcow2","file":"libvirt-3-storage","backing":null}' \
>> -blockdev
>> '{"driver":"throttle","node-name":"libvirt-5-filter","throttle-group":"limit0","file":"libvirt-3-format"}' \
>> -blockdev
>> '{"driver":"throttle","node-name":"libvirt-6-filter","throttle-group":"limit012","file":"libvirt-5-filter"}' \
>> -device
>> virtio-blk-pci,bus=pci.0,addr=0x5,drive=libvirt-6-filter,id=virtio-disk1 \
>> -blockdev
>> '{"driver":"file","filename":"/virt/disks/vm1_disk_2.qcow2","node-name":"libvirt-2-storage","auto-read-only":true,"discard":"unmap"}' \
>> -blockdev
>> '{"node-name":"libvirt-2-format","read-only":false,"driver":"qcow2","file":"libvirt-2-storage","backing":null}' \
>> -blockdev
>> '{"driver":"throttle","node-name":"libvirt-3-filter","throttle-group":"limit1","file":"libvirt-2-format"}' \
>> -blockdev
>> '{"driver":"throttle","node-name":"libvirt-4-filter","throttle-group":"limit012","file":"libvirt-3-filter"}' \
>> -device
>> virtio-blk-pci,bus=pci.0,addr=0x6,drive=libvirt-4-filter,id=virtio-disk2 \
>> -blockdev
>> '{"driver":"file","filename":"/virt/disks/vm1_disk_3.qcow2","node-name":"libvirt-1-storage","auto-read-only":true,"discard":"unmap"}' \
>> -blockdev
>> '{"node-name":"libvirt-1-format","read-only":false,"driver":"qcow2","file":"libvirt-1-storage","backing":null}' \
>> -blockdev
>> '{"driver":"throttle","node-name":"libvirt-1-filter","throttle-group":"limit2","file":"libvirt-1-format"}' \
>> -blockdev
>> '{"driver":"throttle","node-name":"libvirt-2-filter","throttle-group":"limit012","file":"libvirt-1-filter"}' \
>> -device
>> virtio-blk-pci,bus=pci.0,addr=0x7,drive=libvirt-2-filter,id=virtio-disk3 \
>> -netdev user,id=user0,hostfwd=tcp::2222-:22 \
>> -device
>> virtio-net-pci,netdev=user0,id=net0,mac=52:54:00:12:34:56,bus=pci.0,addr=0x3 \
>> -chardev pty,id=charserial0 \
>> -device isa-serial,chardev=charserial0,id=serial0,index=0 \
>> -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x2 \
>> -sandbox
>> on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
>> -msg timestamp=on/
>>
>>
>> snapshot and reverting:
>>
>> /(qemu) info status
>> VM status: running
>> (qemu) savevm snapshot1
>> (qemu) loadvm snapshot1/
>>
>>
>> my env:
>> /:~# qemu-system-x86_64 --version
>> QEMU emulator version 6.2.0 (Debian 1:6.2+dfsg-2ubuntu6.17)
>> Copyright (c) 2003-2021 Fabrice Bellard and the QEMU Project developers
>>
>> :~# lsb_release -a
>> No LSB modules are available.
>> Distributor ID: Ubuntu
>> Description: Ubuntu 22.04.4 LTS
>> Release: 22.04
>> Codename: jammy/
>>
>> --
>> Thanks and Regards,
>>
>> Wu
>
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2024-04-01 5:06 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2024-03-27 23:32 qemu process consumes 100% host CPU after reverting snapshot Chun Feng Wu
2024-03-28 10:50 ` Chun Feng Wu
2024-04-01 5:05 ` Dongli Zhang
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