Date: Mon, 7 Oct 2019 10:25:46 +0000 (UTC) From: Hans Petter Selasky <hselasky@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r353258 - stable/11/sys/dev/mlx5/mlx5_core Message-ID: <201910071025.x97APkAc024766@repo.freebsd.org>
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Author: hselasky Date: Mon Oct 7 10:25:46 2019 New Revision: 353258 URL: https://svnweb.freebsd.org/changeset/base/353258 Log: MFC r352993: 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@ Sponsored by: Mellanox Technologies Modified: stable/11/sys/dev/mlx5/mlx5_core/mlx5_vsc.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/dev/mlx5/mlx5_core/mlx5_vsc.c ============================================================================== --- stable/11/sys/dev/mlx5/mlx5_core/mlx5_vsc.c Mon Oct 7 10:25:08 2019 (r353257) +++ stable/11/sys/dev/mlx5/mlx5_core/mlx5_vsc.c Mon Oct 7 10:25:46 2019 (r353258) @@ -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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