Author: hselasky
Date: Wed Oct 2 10:59:44 2019
New Revision: 352993
URL: https://svnweb.freebsd.org/changeset/base/352993
Log:
Randomize the delay when waiting for VSC flag in mlx5core.
The PRM suggests random 0 - 10ms to prevent multiple waiters on the same
interval in order to avoid starvation.
Submitted by: slavash@
MFC after: 3 days
Sponsored by: Mellanox Technologies
Modified:
head/sys/dev/mlx5/mlx5_core/mlx5_vsc.c
Modified: head/sys/dev/mlx5/mlx5_core/mlx5_vsc.c
==============================================================================
--- head/sys/dev/mlx5/mlx5_core/mlx5_vsc.c Wed Oct 2 10:58:27 2019
(r352992)
+++ head/sys/dev/mlx5/mlx5_core/mlx5_vsc.c Wed Oct 2 10:59:44 2019
(r352993)
@@ -52,7 +52,7 @@ int mlx5_vsc_lock(struct mlx5_core_dev *mdev)
* The PRM suggests random 0 - 10ms to prevent multiple
* waiters on the same interval in order to avoid
starvation
*/
- DELAY((random() % 11) * 1000);
+ DELAY((random() % 9000) + 1000);
continue;
}
@@ -99,7 +99,7 @@ mlx5_vsc_wait_on_flag(struct mlx5_core_dev *mdev, u32
break;
retries++;
- DELAY(10);
+ DELAY((random() % 90) + 10);
}
return 0;
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