IOThread Virtqueue Mapping Improving virtioblk SMP scalability in QEMU by Stefan Hajnoczi

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=tVIRDdf79-0

Guests with multiple vCPUs are commonplace and can submit I/O requests from any vCPU. While virtio-blk supports exposing multiple queues to the guest, QEMU processed all queues in a single thread until recently. • This talk introduces the virtio-blk IOThread Virtqueue Mapping feature added in QEMU 9.0. This feature improves scalability by processing queues in a user-configurable number of threads. Removing the single threaded bottleneck narrows the performance gap between bare metal and virtualization. • Benchmark results are presented to quantify the impact on performance. Configuration topics like choosing the number of threads are discussed. Finally, open issues and future support in virtio-scsi and other devices types are also covered. • Slides: • https://pretalx.com/media/kvm-forum-2... • --- • Stefan Hajnoczi • Stefan works on QEMU and Linux VIRTIO drivers in Red Hat's Virtualization team. He focuses on storage and has worked on virtiofs, virtio-vsock, and tracing in the past. A QEMU contributor since 2010, he organizes open source internships for QEMU and is part of QEMU's Technical Leadership Committee.

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