Le 09/05/2016 14:58, Alexandre DERUMIER a écrit : > BTW, > > what is the host cpu model ?
My tests were mostly done on "recent" intel CPUs, i5 & i7 (4th gen, 6th gen) mostly. Gilles > > > ----- Mail original ----- > De: "aderumier" <[email protected]> > À: "proxmoxve" <[email protected]> > Envoyé: Mercredi 4 Mai 2016 14:52:14 > Objet: Re: [PVE-User] Regression on virtio-net ? (Was: Re: Proxmox VE 4.2 > released!) > > 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 > > _______________________________________________ > 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
