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    SubjectRe: [PATCH v7 16/46] virtio_blk: v1.0 support
    On Mon, Dec 01, 2014 at 12:33:15PM +0100, Cornelia Huck wrote:
    > On Mon, 1 Dec 2014 11:26:58 +0200
    > "Michael S. Tsirkin" <mst@redhat.com> wrote:
    >
    > > For some places on data path, it might be worth it
    > > to cache the correct value e.g. as part of device
    > > structure. This replaces a branch with a memory load,
    > > so the gain would have to be measured, best done
    > > separately?
    >
    > I think we'll want to do some measuring once the basic structure is
    > in place anyway.

    What's meant by in place here?

    > We should make sure that e.g. s390 only takes minor
    > hit due to all that swapping that is needed for standard-compliant
    > devices. Caching the value might certainly help in some paths.

    Well, this is queued in linux-next for 3.19, so
    now's the time to do it :)


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