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Randomize the delay when waiting for VSC flag in mlx5core.

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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
This commit is contained in:
Hans Petter Selasky 2019-10-02 10:59:44 +00:00
parent eff4361d88
commit 7bf46a63ce
1 changed files with 2 additions and 2 deletions
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4
sys/dev/mlx5/mlx5_core/mlx5_vsc.c
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@ -52,7 +52,7 @@ int mlx5_vsc_lock(struct mlx5_core_dev *mdev)
* The PRM suggests random 0 - 10ms to prevent multiple * The PRM suggests random 0 - 10ms to prevent multiple
* waiters on the same interval in order to avoid starvation * waiters on the same interval in order to avoid starvation
*/ */
DELAY((random() % 11) * 1000); DELAY((random() % 9000) + 1000);
continue; continue;
} }
@ -99,7 +99,7 @@ mlx5_vsc_wait_on_flag(struct mlx5_core_dev *mdev, u32 expected)
break; break;
retries++; retries++;
DELAY(10); DELAY((random() % 90) + 10);
} }
return 0; return 0;