Same problem here: https://forum.proxmox.com/threads/wrong-cpu-usage.27080/
----- Mail original ----- De: "Wolfgang Bumiller" <[email protected]> À: "Gilou" <[email protected]> Cc: "proxmoxve" <[email protected]> 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: > > https://gist.github.com/gilou/15b620a7a067fd1d58a7616942e025b4#file-perf_virtionet_4-4-txt > > > 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. > > Regards, > > Gilles Pietri _______________________________________________ pve-user mailing list [email protected] http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user _______________________________________________ pve-user mailing list [email protected] http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user
