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Friday, October 30 • 14:00 - 14:30
Speeding Up VM’s I/O Sharing Host's io_uring Queues With Guests - Stefano Garzarella, Red Hat

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io_uring is the newest Linux I/O interface. It provides submission and completion queues for performing asynchronous I/O operations.

The queues are located in a memory region shared between the userspace application and the kernel. This aims to reduce the number of syscalls required for I/O operations and provides a way to poll efficiently. io_uring achieves good performance and it makes exposing submission and completion queues to guests an attractive idea for improving I/O performance in virtualization.

Stefano will give a brief overview of io_uring API. Then, he will illustrate how the host's io_uring queues can be shared with guests to improve I/O performance of a block device and which io_uring changes are required to safely give queues access to the guest. Finally, Stefano will show the performance boost achieved with the proposed approach and future steps.

avatar for Stefano Garzarella

Stefano Garzarella

Senior Software Engineer, Red Hat
Stefano is a Senior Software Engineer at Red Hat. He is working on virtualization and networking topics in QEMU and Linux kernel. He is a co-maintainer of Linux's virtio-vsock. Current projects cover virtio-vsock, vDPA, QEMU network and storage, and lightweight VMs.

Friday October 30, 2020 14:00 - 14:30 GMT
KVM Theater
  KVM Track 1