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authorHaiyang Zhang <haiyangz@microsoft.com>2015-03-27 09:10:14 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-04-03 16:18:02 +0200
commite1c0d82dab4a4605d3bd1968436f030dfed4a829 (patch)
treea56cd6795efdc91310c013a6bb4621947cb937c7 /drivers/hv
parent0a1a86ac046091d7228c9f3a283dea5be96275dd (diff)
downloadop-kernel-dev-e1c0d82dab4a4605d3bd1968436f030dfed4a829.zip
op-kernel-dev-e1c0d82dab4a4605d3bd1968436f030dfed4a829.tar.gz
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')
-rw-r--r--drivers/hv/connection.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index 583d7d4..b27220a 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;
}
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