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net/mlx4_en: Use affinity hint

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The “affinity hint” mechanism is used by the user space
daemon, irqbalancer, to indicate a preferred CPU mask for irqs.
Irqbalancer can use this hint to balance the irqs between the
cpus indicated by the mask.

We wish the HCA to preferentially map the IRQs it uses to numa cores
close to it.  To accomplish this, we use cpumask_set_cpu_local_first(), that
sets the affinity hint according the following policy:
First it maps IRQs to “close” numa cores.  If these are exhausted, the
remaining IRQs are mapped to “far” numa cores.

Signed-off-by: Yuval Atias <[email protected]>
Signed-off-by: Amir Vadai <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Yuval Atias 2014-05-25 17:47:27 +03:00 • committed by David S. Miller
commit 70a640d0da
6 changed files with 50 additions and 4 deletions
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2
drivers/infiniband/hw/mlx4/main.c
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@ -1897,7 +1897,7 @@ static void mlx4_ib_alloc_eqs(struct mlx4_dev *dev, struct mlx4_ib_dev *ibdev)
i, j, dev->pdev->bus->name);
/* Set IRQ for specific name (per ring) */
if (mlx4_assign_eq(dev, name, NULL,
&ibdev->eq_table[eq])) {
&ibdev->eq_table[eq], NULL)) {
/* Use legacy (same as mlx4_en driver) */
pr_warn("Can't allocate EQ %d; reverting to legacy\n", eq);
ibdev->eq_table[eq] =