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

[Gilou]

Le 29 avril 2016 00:47:40 GMT+02:00, Alexandre DERUMIER
<aderumier at odiso.com> a écrit :
>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.
>

I did that, running qemu 2.5 (proxmox 4.2) on kernel 4.2, and CPU usage
is as expected (~1 GHz for 1 Gbps).

Reboot on kernel 4.4 and it goes 100% of a core (on a 3.3 GHz CPU).

>
>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

Will do.

Thanks

Gilles
>
>
>
>
>
>----- 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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