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| author | Haiyang Zhang | 2015-03-27 17:10:14 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2015-04-03 16:18:02 +0200 |
| commit | e1c0d82dab4a4605d3bd1968436f030dfed4a829 (patch) | |
| tree | a56cd6795efdc91310c013a6bb4621947cb937c7 /drivers/hv/connection.c | |
| parent | Drivers: hv: hv_balloon: survive ballooning request with num_pages=0 (diff) | |
| download | kernel-qcow2-linux-e1c0d82dab4a4605d3bd1968436f030dfed4a829.tar.gz kernel-qcow2-linux-e1c0d82dab4a4605d3bd1968436f030dfed4a829.tar.xz kernel-qcow2-linux-e1c0d82dab4a4605d3bd1968436f030dfed4a829.zip | |
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/hv/connection.c')
| -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; } |