[PVE-User] Regression on virtio-net ? (Was: Re: Proxmox VE 4.2 released!)

[Alexandre DERUMIER]

Can you try with previous kernel 4.2 ?  (and keep proxmox 4.2 )

I would like to known if it's a regression in qemu or kernel.


also, you can try to install 

#apt-get install linux-tools-4.4

and do a 

#perf top


you should see which system call use a lot of cpu





----- Mail original -----
De: "Gilou" <contact+dev at gilouweb.com>
À: "proxmoxve" <pve-user at pve.proxmox.com>
Envoyé: Jeudi 28 Avril 2016 19:31:19
Objet: Re: [PVE-User] Regression on virtio-net ? (Was: Re: Proxmox VE 4.2 released!)

Le 28/04/2016 19:18, Gilou a écrit : 
> Le 27/04/2016 15:35, Martin Maurer a écrit : 
>> Hi all! 
>> 
>> We are proud to announce the final release of our Proxmox VE 4.2 with 
>> the new GUI. 
>> 
>> The Sencha Ext JS 6 framework brings a modern 'flat design' look and 
>> feel to the Proxmox VE GUI with a reworked icon set providing 
>> consistency and an improved user experience. 
>> 
>> Watch our short introduction video - What's new in Proxmox VE 4.2 
>> http://www.proxmox.com/en/training/video-tutorials/item/what-s-new-in-proxmox-ve-4-2 
>> 
>> 
>> This point release is based on latest and greatest Debian Jessie and a 
>> 4.4.6 Linux kernel, based on Ubuntu 16.04 LTS kernel. 
> 
> Hi, 
> 
> I seem to have a regression, and a weird one I see neither on Proxmox 
> 4.1 4.2.6's kernel, nor on Ubuntu 4.4.0, or 
> 
> Context: Ubuntu Guest VM using Ubuntu 16.04 on a virtio_net device 
> (tested also on Debian 8, and CentOS7), connected on a bridge. 
> 
> on 4.1 : 1 Gbps bandwidth, ~1 GHz of CPU 
> on 4.2 : 1 Gbps bandwidth, ~3 GHz of CPU 
> 
> Tested using transfer to /dev/null & iperf, so no disk involved. 
> 
> I do not have the issue on ubuntu 4.4.0 using virtualbox/virtio-net. 
> 
> Haven't tested further, but this is an isssue. 

Looked into it, it's really 100% of a core, in the following setups: 
- single CPU on the VM 
- local or remote traffic (local goes up to 24 Gbps, remote is 1 Gbps) 
- no matter what distro (haven't tested Windows) 

Has anyone noticed something like this or is this something specific? 

Regards, 


> 
> Regards, 
> Gilles Pietri 
> 
> 
>> 
>> We included as always countless small improvements and bugfixes, like 
>> the ability to use Let´s Encrypt certificates. 
>> 
>> Release notes 
>> http://pve.proxmox.com/wiki/Roadmap#Proxmox_VE_4.2 
>> 
>> ISO Download 
>> 
>> http://www.proxmox.com/en/downloads 
>> 
>> Alternate ISO download: 
>> http://download.proxmox.com/iso/ 
>> 
>> Upgrading 
>> http://pve.proxmox.com/wiki/Downloads 
>> 
>> Bugtracker 
>> https://bugzilla.proxmox.com 
>> 
>> A big THANK-YOU to our active community for all feedback, testing, bug 
>> reporting and patch submissions. 
>> 
> 
> _______________________________________________ 
> pve-user mailing list 
> pve-user at pve.proxmox.com 
> http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user 
> 

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