[PATCH 03/28] Drivers: hv: Turn off batched reading for util drivers
K. Y. Srinivasan
kys at microsoft.com
Sat Dec 1 14:46:34 UTC 2012
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 at microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz at 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
@@ -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,
More information about the devel