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hv_vmbus: Add gradually increased delay for retries in vmbus_post_msg()

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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>
This commit is contained in:
Haiyang Zhang 2015-03-27 09:10:14 -07:00 committed by Greg Kroah-Hartman
parent 0a1a86ac04
commit e1c0d82dab
1 changed files with 5 additions and 2 deletions
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7
drivers/hv/connection.c
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@ -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;
}