> -----Original Message----- > From: devel [mailto:driverdev-devel-bounces@xxxxxxxxxxxxxxxxxxxxxx] On Behalf > Of Haiyang Zhang > Sent: Thursday, March 26, 2015 6:59 > To: KY Srinivasan > Cc: jasowang@xxxxxxxxxx; Haiyang Zhang; driverdev- > devel@xxxxxxxxxxxxxxxxxxxxxx; olaf@xxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx > Subject: [PATCH] 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@xxxxxxxxxxxxx> > Reviewed-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx> > --- > 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 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; > } The patch is good to me. Reviewed-by: Dexuan Cui <decui@xxxxxxxxxxxxx> _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
