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    Subject[PATCH 03/28] Drivers: hv: Turn off batched reading for util drivers
    Date
    Util driver is not a performance critical driver and furthermore some
    util services such as KVP can only handle one outstanding message
    from the host. Turn off batched reading for util drivers.

    Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
    Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
    ---
    drivers/hv/hv_util.c | 10 ++++++++++
    1 files changed, 10 insertions(+), 0 deletions(-)

    diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c
    index a0667de..a62a760 100644
    --- a/drivers/hv/hv_util.c
    +++ b/drivers/hv/hv_util.c
    @@ -274,6 +274,16 @@ static int util_probe(struct hv_device *dev,
    }
    }

    + /*
    + * The set of services managed by the util driver are not performance
    + * critical and do not need batched reading. Furthermore, some services
    + * such as KVP can only handle one message from the host at a time.
    + * Turn off batched reading for all util drivers before we open the
    + * channel.
    + */
    +
    + set_channel_read_state(dev->channel, false);
    +
    ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
    srv->util_cb, dev->channel);
    if (ret)
    --
    1.7.4.1


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