diff options
| author | Haiyang Zhang <haiyangz@microsoft.com> | 2015-03-27 09:10:14 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-04-03 16:18:02 +0200 |
| commit | e1c0d82dab4a4605d3bd1968436f030dfed4a829 (patch) | |
| tree | a56cd6795efdc91310c013a6bb4621947cb937c7 /drivers | |
| parent | 0a1a86ac046091d7228c9f3a283dea5be96275dd (diff) | |
hv_vmbus: Add gradually increased delay for retries in vmbus_post_msg()
Most of the retries can be done within a millisecond successfully, so we
sleep 1ms before the first retry, then gradually increase the retry
interval to 2^n with max value of 2048ms. Doing so, we will have shorter
overall delay time, because most of the cases succeed within 1-2 attempts.
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/hv/connection.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c index 583d7d42b46d..b27220a425f4 100644 --- a/drivers/hv/connection.c +++ b/drivers/hv/connection.c @@ -422,6 +422,7 @@ int vmbus_post_msg(void *buffer, size_t buflen) union hv_connection_id conn_id; int ret = 0; int retries = 0; + u32 msec = 1; conn_id.asu32 = 0; conn_id.u.id = VMBUS_MESSAGE_CONNECTION_ID; @@ -431,7 +432,7 @@ int vmbus_post_msg(void *buffer, size_t buflen) * insufficient resources. Retry the operation a couple of * times before giving up. */ - while (retries < 10) { + while (retries < 20) { ret = hv_post_message(conn_id, 1, buffer, buflen); switch (ret) { @@ -454,7 +455,9 @@ int vmbus_post_msg(void *buffer, size_t buflen) } retries++; - msleep(1000); + msleep(msec); + if (msec < 2048) + msec *= 2; } return ret; } |