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; _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"