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    SubjectRe: [RFC PATCH]vhost-blk: In-kernel accelerator for virtio block device
    Hi Liu Yuan,

    I am glad to see that you started looking at vhost-blk. I did an
    attempt year ago to improve block
    performance using vhost-blk approach.

    http://lwn.net/Articles/379864/
    http://lwn.net/Articles/382543/

    I will take a closer look at your patchset to find differences and
    similarities.

    - I focused on using vfs interfaces in the kernel, so that I can use it
    for file-backed devices.
    Our use-case scenario is mostly file-backed images.

    - In few cases, virtio-blk did outperform vhost-blk -- which was counter
    intuitive - but
    couldn't exactly nail down. why ?

    - I had to implement my own threads for parellism. I see that you are
    using aio infrastructure
    to get around it.

    - In our high scale performance testing, what we found is block-backed
    device performance is
    pretty close to bare-metal (91% of bare-metal). vhost-blk didn't add any
    major benefits to it.
    I am curious on your performance analysis & data on where you see the
    gains and why ?

    Hence I prioritized my work low :(

    Now that you are interested in driving this, I am happy to work with you
    and see what
    vhost-blk brings to the tables. (even if helps us improve virtio-blk).

    Thanks,
    Badari




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