Re: [Qemu-devel] any known virtio-net regressions in Qemu 2.7?
On Mon, Dec 19, 2016 at 07:37:30PM +0100, Stefan Priebe - Profihost AG wrote: > Am 19.12.2016 um 12:03 schrieb Stefan Hajnoczi: > > On Fri, Dec 16, 2016 at 10:00:36PM +0100, Stefan Priebe - Profihost AG > > wrote: > >> > >> 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. > > > > Interesting discovery. Have you filed a bug report about it? > > As we're not using RHEL, nor CentOS i didn't expect this to make sense > ;-) I just believed that something in the kernel changed. I see. At least the tuned maintainers are aware of it now. If others report the same problem maybe it can be solved. Thanks! Stefan > >> 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. > > > > Stefan > > signature.asc Description: PGP signature
Re: [Qemu-devel] any known virtio-net regressions in Qemu 2.7?
Am 19.12.2016 um 12:03 schrieb Stefan Hajnoczi: > On Fri, Dec 16, 2016 at 10:00:36PM +0100, Stefan Priebe - Profihost AG wrote: >> >> 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. > > Interesting discovery. Have you filed a bug report about it? As we're not using RHEL, nor CentOS i didn't expect this to make sense ;-) I just believed that something in the kernel changed. Greets, Stefan >> 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. > > Stefan >
Re: [Qemu-devel] any known virtio-net regressions in Qemu 2.7?
On Fri, Dec 16, 2016 at 10:00:36PM +0100, Stefan Priebe - Profihost AG wrote: > > 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. Interesting discovery. Have you filed a bug report about it? > 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. Stefan signature.asc Description: PGP signature
Re: [Qemu-devel] any known virtio-net regressions in Qemu 2.7?
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 >> >
Re: [Qemu-devel] any known virtio-net regressions in Qemu 2.7?
does rollbacking the kernel to previous version fix the problem ? 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 >
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"> À: "qemu-devel" > 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 >
Re: [Qemu-devel] any known virtio-net regressions in Qemu 2.7?
Hi Stefan, do you have upgraded kernel ? maybe it could be related to vhost-net module too. - Mail original - De: "Stefan Priebe, Profihost AG"À: "qemu-devel" 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