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    SubjectRe: [PATCH 0/6][RFC] virtio-blk: Change I/O path from request to BIO
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    On Wed, Dec 21, 2011 at 1:00 AM, Minchan Kim <minchan@kernel.org> wrote:
    > This patch is follow-up of Christohp Hellwig's work
    > [RFC: ->make_request support for virtio-blk].
    > http://thread.gmane.org/gmane.linux.kernel/1199763
    >
    > Quote from hch
    > "This patchset allows the virtio-blk driver to support much higher IOP
    > rates which can be driven out of modern PCI-e flash devices.  At this
    > point it really is just a RFC due to various issues."

    Basic question to make sure I understood this series: does this patch
    bypass the guest I/O scheduler (but then you added custom batching
    code into virtio_blk.c)?

    If you're stumped by the performance perhaps compare blktraces of the
    request approach vs the bio approach. We're probably performing I/O
    more CPU-efficiently but the I/O pattern itself is worse.

    Stefan
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