Date: Wed, 2 Oct 2019 10:59:44 +0000 (UTC) From: Hans Petter Selasky <hselasky@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r352993 - head/sys/dev/mlx5/mlx5_core Message-ID: <201910021059.x92AxiAf059394@repo.freebsd.org>
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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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