On 03/05/2013 11:59 PM, Stefan Hajnoczi wrote: >> I am looking for a way to help improving qemu block performance. >> > >> > APIC-V is a work in progress and the two options with public code are >> > vhost-* >> > and virtio-blk-dataplane. >> > >> > The way of doing seems very similar (bypassing the qemu lock) and >> > dedicating >> > a thread to each emulated virtio block device. >> > >> > vhost-* is in kernel while dataplane is in qemu. > Yes, they take a similar approach. The main difference is using a > vhost kernel thread versus a QEMU userspace thread. >
The other merit of blk-dataplane over in-kernel vhost_blk that I can think of, is underlying various protocols such as Sheepdog would benefit from it without adding code, assuming the final goal of blk-dataplain is fully fulfilled that aims to be integrated into QEMU block layer. For vhost_blk, ony local backing file will benefit from it without adding more code in the kernel. Thanks, Yuan
