Hi, We are experiencing some network limitations on our virtual machines, we have done some initial testing to pinpoint the exact issue. Hardware: 2 x 25G NICs per physical machine 2 x 100G interlinks between datacenters iPerf test between two VMs in same host on same cluster and same datacenter reveals ~20GB/s (what is more or less expected) iPerf test between two VMs in differet host on same cluster and same datacenter reveals ~20GB/s (what is more or less expected) iPerf test between two VMs in differet host on different cluster and different datacenter reveals ~10GB/s (what is half or less than expected) There are no firewalls or other identified blockeing equipment between the datacenters. The only difference, as I see it, are traffic going across the 100G interlinks. Are there anything that needs to be tuned / setup in the NICs either on the VM or the host to be able to get higher speed between the datacenters? /John _______________________________________________ Users mailing list -- users(a)ovirt.org To unsubscribe send an email to users-leave(a)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/HAJBDJVKH3K...

On Mar 15, 2024, at 7:48 AM, John Mortensen <jpm(a)b4restore.com&gt; wrote: Hi Jorge, We're using the VirtIO driver, the MTU is 9000 and the physical NICs are 25G. The ports are grouped in bonds. ( 2 x 25G interfaces in a bond ) After additional tests we have seen the following: * between vm's on same host - speed is as expected * between vm's on different hosts in same cluster - speed is as expected * between vm's on different hosts and in different cluster - speed is much lower than expected. I was curious why the speed drops when we go across clusters, and was wondering if there are some limitations cluster wide or some tuning cluster wide that could be tweaked. /John /John _______________________________________________ Users mailing list -- users(a)ovirt.org To unsubscribe send an email to users-leave(a)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/XNNYC7MXPDP...