Am 15.12.2016 um 07:46 schrieb Alexandre DERUMIER: > does rollbacking the kernel to previous version fix the problem ?
The culprit is the used tuned agent from Redhat (https://github.com/redhat-performance/tuned). The used profile virtual-host results in these problems. Stopping tuned or using another profile like throughput-performance everything is fine again. Geets, Stefan > > i'm not sure if "perf" could give you some hints > ----- Mail original ----- > De: "Stefan Priebe, Profihost AG" <s.pri...@profihost.ag> > À: "aderumier" <aderum...@odiso.com> > Cc: "qemu-devel" <qemu-devel@nongnu.org> > Envoyé: Mercredi 14 Décembre 2016 21:36:23 > Objet: Re: [Qemu-devel] any known virtio-net regressions in Qemu 2.7? > > Am 14.12.2016 um 16:33 schrieb Alexandre DERUMIER: >> Hi Stefan, >> >> do you have upgraded kernel ? > > Yes sure. But i'm out of ideas how to debug. Sometimes it gives me > constant 80MB/s, sometimes 125 and sometimes only 6. While on the host > the cards are not busy. > > Greets, > Stefan > >> >> maybe it could be related to vhost-net module too. >> >> >> ----- Mail original ----- >> De: "Stefan Priebe, Profihost AG" <s.pri...@profihost.ag> >> À: "qemu-devel" <qemu-devel@nongnu.org> >> Envoyé: Mercredi 14 Décembre 2016 16:04:08 >> Objet: [Qemu-devel] any known virtio-net regressions in Qemu 2.7? >> >> Hello, >> >> after upgrading a cluster OS, Qemu, ... i'm experiencing slow and >> volatile network speeds inside my VMs. >> >> Currently I've no idea what causes this but it's related to the host >> upgrades. Before i was running Qemu 2.6.2. >> >> I'm using virtio for the network cards. >> >> Greets, >> Stefan >> >