Questions tagged [virtio]

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VirtIO ethernet adapter limited performance

I have a Windows 10 KVM VM on Ubuntu 20.04. The host has dual 10 GbE adapters configured as LACP bond and there's a bridge interface for the VM and it's on the same LAN as the host. Windows has VirtIO ...
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1answer
18 views

Partition of mdadm raid0 array passed through to win10 20H2 via virto driver is suddenly lost. How can I figure out why?

I have checked the logs. System has been working for a month then suddenly they could not see the drive on network. It is a linux file server with a virtual windows on top of it ... Virtual windows ...
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1answer
39 views

number of read and write processes affect the io performance of different virtio-scsi luns

QEMU emulator version 2.9.0(qemu-kvm-ev-2.9.0-16.el7_4.11.1) Linux 3.10.0-693.el7.x86_64 There is two luns attached via virtio-scsi (vcpu=1,virtio-scsi controller queue set to 1) Firt: dd /dev/sde ...
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95 views

Qemu Libvirt : unabled to pass all GPUs to vms

Im trying to pass all gpus to different systems , my setup: asus x399 gaming 6 mainboard amd 1950x 32G ram 1 TB intel ssd m.2 gtx970 gtx750 this resources should be passed into 3 systems: vm1 a ...
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302 views

QEMU vmvga + Windows - Which driver to use?

I am trying to find a driver for Windows 7/8/10 to use the "vmvga" display driver with QEMU+KVM. For Linux, this driver is available by default, and for OSX there's VmsVGA2, but where can I find the ...
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22 views

How to automate windows installation with Virtio driver?

I thought about using autounattend.xml to do this, how should I approach this? Specifically for Windows server 2019. My problem is that I would have to do something like this: select the folder ...
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1answer
48 views

What is the role of QEMU in server virtualisation?

I am aware of that KVM provides hardware acceleration feature by utilises the virtualisation extension in CPU chips like Intel VT. So that VCPUs can be directly mapped to physical CPUs to achieve ...
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1answer
963 views

(QEMU) Setup Windows 10 VM on a thinly-provisioned LVM device with discards (a.k.a. trim)

I'm trying to set up a Windows 10 VM using QEMU and I want to use a thinly-provisioned LVM volume and be able to "retrim" the drive in Windows. I created the device with: -drive index=0,media=disk,...
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222 views

KVM - Modify from IDE to VirtIO

I imported a CentOS 7 guest from XenServer to KVM. After importing it into KVM the disk bus in use is the IDE. I need to change the disk bus from IDE to VirtIO because VirtIO has better performance. ...
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0answers
512 views

Imbalanced IRQs on virtio devices

I noticed in the top on my linux server that one cpu had far more number of software interrupts than all other 7 cores. Digging further, I noticed that this core is pinned to a particular irq which ...
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0answers
503 views

Is it possible to set an IO scheduler in KVM Guest with VirtIO?

Is it possible to set an IO scheduler in a KVM Guest with VirtIO? With the following command i don't get any options to choose cat /sys/block/vda/queue/schedule none Kerneloption are set: [email protected]
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2k views

libvirt cannot boot windows-uefi guest with virtio storage

i have hyper-v gen2 win-guest and need to migrate on kvm with libvirt. I convert one guest from vhdx to qcow2 with qemu-img, start it with qemu-system and hda-drive, install virtio drivers. After that ...
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2answers
8k views

qemu-kvm reclamation of memory from low-use guests

Is there a way to transparently reclaim, or prevent usage of, memory from a qemu-kvm guest? Scenario A: A guest uses 8GB of RAM during peak hours, it returns back to 4GB of usage at night, but the ...
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0answers
2k views

Unidentified network with VIRTIO NIC Drivers after system reboot

I have KVM with VIRTIO network interface. It runs under Windows Server 2012 R2 so I installed RedHat network virtio drivers. It runs properly but after system reboot internet connection is lost. ...
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1answer
445 views

windows guest OS over kvm hypervisor does not preserve disk status after attaching network interface

I have openstack based cloud environment. I have kvm/qemu based hypervisors. I created Windows guest OS vm on one of the hypervisors. And I attached volume(vhd) to vm. I changed disk status to online ...

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