similar to: why increasing vCPUs increasing the CPU sockets for QEMU+KVM

Hi Daniel, Thanks a lot for the quick and detailed explanation. Please see my another query below. >>In normal usage, the guest vCPUs will be floating arbitrarily across any >>host physical CPUs. So trying to match host / guest topology is not only >>useless, it might actually degrade your performance - eg if you give the >>guest 1 socket, 1 core and 2 threads, but he

On Mon, Jun 05, 2017 at 08:40:19PM +0530, girish kumar wrote: > Hi All, > > I am new here, please warn me If I am not following proper etiquette of > this mailing list. > > I am breaking my head, regarding why libvirt is defining multiple CPU > sockets when I increase the vCPU count. As and when I increase the vCPU > count in libvirt guest XML, it is increasing the CPU

[moderator note: I'm forwarding a stripped down version of the original mail which was rejected in the moderator queue. I stripped the 3.3 megabyte .tar.bz2 of the log file attachment, which is inappropriate for a technical list. Either trim the log to the relevant portion, or host the log externally and have your list email merely give a URL of the externally-hosted file] >

So it didn't make any noticable difference in my test. I wonder if the test guest I'm using (Fedora 32 using dracut) doesn't use parallel compression? However I don't think it can cause a problem and it seems obvious that it could benefit some cases. Rich.

On Fri, Sep 18, 2020 at 10:52:58AM +0100, Daniel P. Berrangé wrote: > On Fri, Sep 18, 2020 at 10:44:03AM +0100, Richard W.M. Jones wrote: > > So it didn't make any noticable difference in my test. I wonder if > > the test guest I'm using (Fedora 32 using dracut) doesn't use parallel > > compression? > > Do you do anything special to optimize storage ? If

Hi folk, we are using 10gb NICs with multithreaded compression. We're finding that the standard `virsh migrate` gets at most ~1.2gbps, similar to a single scp session. When we do a multipart upload with multiple scp connections we can squeeze as high as 9.6gbps. Is there was a way to get `virsh migrate` to perform multiple connections as well when transferring? Would be useful to be able

>> I have an Ubuntu 18.04 system. What is the easiest way to run all of my virtual machines with a low priority? Say a "nice" level of 15. > > You can use the <vcpusched> (and related elements) to control > the schedular nice level up or down > > https://libvirt.org/formatdomain.html#elementsCPUTuning Thanks for your quick answer. I took at look at

Hello, We are currently facing a strange situation. One of our VM is shown by 'virsh list' as in state "in shutdown" but there is no more a qemu-kvm process linked to it. So we have a few questions: 1. What does means the state in shutdown (I have not found much information about it)? 2. How to cleanly "shutdown" the vm, or more correctly, clean the status in

Hi Daniel, Thanks for your immidiate reply. The starting of virtual guest was ok on our machine. We are facing this issue while executing the "cpu-stats <domain name>" command. I have collected the debug logs as you suggested and attaching the same. <<libvirt_testing_starting_VG.log >> --> Log collected while starting the virtual guest

> You would have to set the priority of all vCPUs in each guest, as well > as emulator threads in each guest (the latter needs very new libvirt). This does not seem a viable option then with Ubuntu 18.04. And changing XML on all guest VMs is extra work. Is there no other way? For example, are all such virtual machines not some daemon or systemd unit or set of units? Would it be feasible to

On Tue, Jun 23, 2015 at 03:41:45PM +0200, Michal Privoznik wrote: > On 23.06.2015 14:16, Ivo Hora wrote: > > Dear Sir, > > > > I am facing the same problem you were discussing here: > > https://www.redhat.com/archives/libvirt-users/2015-January/msg00070.html > > > > I am getting this error: > > Starting install... > > ERROR internal error:

On Mon, Aug 03, 2020 at 01:45:45PM +0000, Kim-Norman Sahm wrote: > hi, > > i’m running Debian 10 on POWER9 and would like to spawn x86_64 emulated VMs. > The virtual machine is configured to run with 8 vpus but it’s very slow. > On the host you can see that the qemu-system-x86_64 process is using just one core! > > Ppc64le guests are using multi cores, so its looks like an

Hi , I'm looking for a possibility to simulate a VM (to be used as a host) reporting no or empty NUMA <cells> in 'virsh capabilities'. 'virsh capabilities' usually reports single NUMA in the VMs, like <numa> <cell id='0' cpus='0-63' memory='16777216' unit='KiB'/> </numa> I appreciate if someone could advise Thank you

How to configure libvirt, so qemu-kvm support nested virtualization, virtual machine installed operating system is windows_7_ultimate_sp1_x64_dvd_618537.iso, configure libvirt xml file is as follows: <cpu mode='custom' match='exact'> <model fallback='allow'>core2duo</model> <feature policy='require' name='vmx'/>

On 5/9/23 9:59 AM, Marc wrote: >> I have a Windows 10 pro (64bit) long time running as a libvirt/KVM guest >> that I think Windows Update finally narfed. >> >> The hardware is a supermicro motherboard with dual Intel E5-2640 CPUs >> for a total of 40 threads and 64GB >> >> The guest is allocated 2sockets, 5cores, 2 threads and 32GB of RAM. >>

Eric Blake <eblake@redhat.com> writes: > [adding Markus] > > On 2/3/20 4:13 AM, Daniel P. Berrangé wrote: >> On Fri, Jan 31, 2020 at 06:44:42AM -0600, Eric Blake wrote: >>> On 1/31/20 4:38 AM, Peter Luo wrote: >>> >>>> error: internal error: cannot parse json {"execute": "block-commit", "arguments": {

Hi all, I have been trying to find out cpu topology using libvirt. When I do 'virsh capabilites', I find this inside <topology> tag: <topology>       <cells num='1'>         <cell id='0'>           <memory unit='KiB'>3908488</memory>           <cpus num='4'>             <cpu id='0' socket_id='0'

Hi all: I have an Ubuntu 18.04 system. What is the easiest way to run all of my virtual machines with a low priority? Say a "nice" level of 15. I just do not want my virtual machines to have too much of an impact in any other processes on the system. Thanks in advance, rdiez

My test box has an AMD dual core processor in it, giving me 2 physical cpu''s. If I overcommit the vcpu''s (eg vcpus=4) to simulate a 4 cpu machine, how accurate a simulation should it be (apart from performance sucking badly)? James _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users

Hi Daniel, Thanks a lot for providing us your pointers. From the domain.xml(attached in my previous mail) which we have used for defining virtual guest i can see below lines <emulator>/usr/local/bin/qemu-system-x86_64</emulator> We were using same domain.xml in eralier libvirt version and the execution of cpu_stats command was successful. Now if we have to get "cpu_stats"