All Questions
Tagged with qemu performance
10 questions
0
votes
0
answers
52
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qemu Harddisk slow access (>10 seconds)
I'm trying to set up multiple Windows guests on a Linux server using KVM / qemu and I'm getting abysmal response on disk reads and writes. Windows 11 Task Manager on one guest is reporting disk ...
- 2,633
1
vote
1
answer
2k
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Determine QEMU KVM overhead?
My guest OS shows about 5 percent CPU usage, but my host machine shows the QEMU process taking about 25 percent.
I'm trying to understand where this difference comes from, as I am using KVM ...
- 355
3
votes
2
answers
2k
views
KVM: Best performance for all guests
With KVM, what is the best way to provide the highest possible performance to all VMs?
The host has a hexa-core processor and 64GB of ram. 3-4 VMs should run on it.
The VMs are idle a lot of the time, ...
- 31
0
votes
1
answer
566
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Poor network performance on host machine using libvirtd / Qemu / KVM
We've got two Fedora 27 servers that we use to host several virtual servers using libvirtd / Qemu / KVM that are experiencing the same issue. When freshly booted, network performance is great, pings ...
- 1
0
votes
1
answer
2k
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KVM-QEMU Windows Guest Memory Speed
How to speed up memory in Windows guest running on KVM-QEMU hypervisor?
The memory speed differs between Ubuntu guest and Windows 2016 Server on the same node quite a lot. Same benchmark tool counts ...
- 1
3
votes
2
answers
5k
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Qemu+libvirt+kvm significant performance lag in VM's
I am troubleshooting poor performance on our new VM host machine which is a Dell PowerEdge R415 with hardware RAID.
We've got about 20 VM's running like this:
qemu-system-x86_64 \
-enable-kvm \
...
- 133
2
votes
1
answer
2k
views
How much of a performance does using QEMU virtualization incur on Windows?
How much of a performance does using QEMU virtualization incur on a Windows host, when both the host and vm are running the same CPU?
Older articles indicate that using kqemu avoided the slow down in ...
- 1,682
13
votes
5
answers
44k
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How to speed up QEMU on Windows host?
We want to run our Ubuntu 64bit web server virtualized/emulated on a Windows 64bit host. Intended use is to distribute the VM to customers who might not have "elevated" or "admin" rights on the ...
- 141
-1
votes
1
answer
1k
views
Kvm poor cpu performance
I have running some Minecraft Servers in a Qemu VM over Libvirt, and the performance is only half good than on real hardware.
Libvirt started the vm over:
/usr/bin/kvm
-S
-M pc-1.1
-cpu SandyBridge,+...
- 21
9
votes
1
answer
3k
views
KVM/Qemu, Ubuntu: Why do more guests CPUs enhance Disk-I/O rapidly?
We have an Heartbeat/DRBD/Pacemaker/KVM/Qemu/libvirt cluster consisting of two nodes.
Each node runs Ubuntu 12.04 64 Bit with the following packages/versions:
Kernel 3.2.0-32-generic #51-Ubuntu SMP
...
- 1,042