On Thu, Dec 1, 2022 at 10:35 AM Gianluca Cecchi <gianluca.cec...@gmail.com> wrote: > > On Thu, Dec 1, 2022 at 7:38 AM Yedidyah Bar David <d...@redhat.com> wrote: >> >> >> If the fault is on the "legacy" application, how can it achieve 5Gbs on >> vSphere? >> >> Best regards, >> -- >> Didi >> > > Yes, your considerations do make sense, Didi. > My main concern at the beginning was that there could be some limitation "at > the wire" with the virtio drivers in Windows. > But I think that the iperf2 test has removed this doubt, correct?
I think so, yes. > Possibly there are other "inefficiencies" in the virtio driver, like what > experimented with the iperf3, so that the application works better with > vSphere than with oVirt. > Do you or other ones have any suggestions to dig into that eventually? Not sure. Perhaps ask on the virtio-win project. > Does it make sense to set the VM as a high performance one and test the > application again? > One thing I noticed is that at source the VM was configured as 4 vcpus with 4 > sockets, besides the hypervisors (both vSphere and oVirt) having 2 sockets. > Do you think it can have any performance impact? My intuition says it might affect performance, but I do not know the specifics well enough. > What could be the best vcpu configuration: 2 sockets and 2 cores each or 1 > socket and 4 cores? I can try to tweak also this config parameters and see Not sure. Perhaps check qemu/libvirt documentation/lists/etc. But perhaps the impact is not due to them but due to how Windows (and perhaps the application?) behaves based on the "available" cpu cores/sockets. E.g. Perhaps with physical 4 sockets compared to 2x2 - where if it was a physical machine, it would affect caching, I guess - Windows/app would optimize memory allocation/use differently. Best regards, -- Didi _______________________________________________ Users mailing list -- users@ovirt.org To unsubscribe send an email to users-le...@ovirt.org Privacy Statement: https://www.ovirt.org/privacy-policy.html oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/ List Archives: https://lists.ovirt.org/archives/list/users@ovirt.org/message/6H3RMUQHZBVAFBB3X3NUW3BDBNSX6KKJ/
