[PVE-User] Regression on virtio-net ? (Was: Re: Proxmox VE 4.2 released!)
aderumier at odiso.com
Wed May 4 14:52:14 CEST 2016
Same problem here:
----- Mail original -----
De: "Wolfgang Bumiller" <w.bumiller at proxmox.com>
À: "Gilou" <contact+dev at gilouweb.com>
Cc: "proxmoxve" <pve-user at pve.proxmox.com>
Envoyé: Mercredi 4 Mai 2016 14:42:51
Objet: Re: [PVE-User] Regression on virtio-net ? (Was: Re: Proxmox VE 4.2 released!)
On Tue, May 03, 2016 at 12:40:08PM +0200, Gilou wrote:
> Le 30/04/2016 07:20, Alexandre DERUMIER a écrit :
> > ok,
> > can you check with perf command ?
> > check both qemu and vhost process
> > "perf top -p pidofqemu"
> > "perf top -p pidofvhost"
> OK, I did it, and hit the bug again, on a different hardware.
> Context is:
> Ubuntu 16.04 VM, single core, host CPU, using virtio-net to blast at 1
> Gbps through the physical NIC. I still have 100% of a core used by the
> kvm process, and the perf top results are here:
> This was done again on a 4.1 updated to a 4.2. I will probably try on a
> fresh 4.2 install to check it out, but I doubt it will change much.
> If I fall back to the 4.2.6 kernel, bug isn't there.
I'll try to bisect this next week. I was able to produce a similar perf
output (read_tsc() at >25% with 4.4, and far below with 4.2).
> I can grant you access to the host should you need that, but I'm pretty
> sure anybody can reproduce that issue. Which brings quite some worries.
> Gilles Pietri
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