DevConf.CZ 2025

Why OCP networking performances on VMs are suboptimal and how to improve them by 5x
2025-06-13 , E112 (capacity 156)

Openshift can be happily deployed on top of Openstack. If you ever went through such an easy and rewarding task, you have possibly been disappointed by the networking performances of your application.

This talk will deep dive on the root causes - it always boils down to (the lack of) GRO and GSO - and will discuss an ongoing effort to address the relevant bottle-necks both at the kernel and virtio level


What level of experience should the audience have to best understand your session?

Advanced - background knowledge and skills are required

Linux and Open Source enthusiast since the past millennium and happily adding bugs to the Linux kernel network stack since a decade.
I'm currently a co-maintainer of the Linux kernel networking subsystem - yeah, world's end can't be far!