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authorDaniel Jurgens <danielj@mellanox.com>2016-10-27 16:36:41 +0300
committerDoug Ledford <dledford@redhat.com>2016-11-16 20:03:44 -0500
commit16b0e0695a73b68d8ca40288c8f9614ef208917b (patch)
tree33cc55e4a4a7ac46c66cabfdf8be6379b60b39bd /drivers/infiniband
parentefd7f40082a0dfd112eb87ff2124467a5739216f (diff)
IB/mlx5: Use cache line size to select CQE stride
When creating kernel CQs use 128B CQE stride if the cache line size is 128B, 64B otherwise. This prevents multiple CQEs from residing in a 128B cache line, which can cause retries when there are concurrent read and writes in one cache line. Tested with IPoIB on PPC64, saw ~5% throughput improvement. Fixes: e126ba97dba9 ('mlx5: Add driver for Mellanox Connect-IB adapters') Signed-off-by: Daniel Jurgens <danielj@mellanox.com> Signed-off-by: Maor Gottlieb <maorg@mellanox.com> Signed-off-by: Leon Romanovsky <leon@kernel.org> Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/infiniband')
-rw-r--r--drivers/infiniband/hw/mlx5/cq.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/infiniband/hw/mlx5/cq.c b/drivers/infiniband/hw/mlx5/cq.c
index 79d017baf6f4..fcd04b881ec1 100644
--- a/drivers/infiniband/hw/mlx5/cq.c
+++ b/drivers/infiniband/hw/mlx5/cq.c
@@ -932,8 +932,7 @@ struct ib_cq *mlx5_ib_create_cq(struct ib_device *ibdev,
if (err)
goto err_create;
} else {
- /* for now choose 64 bytes till we have a proper interface */
- cqe_size = 64;
+ cqe_size = cache_line_size() == 128 ? 128 : 64;
err = create_cq_kernel(dev, cq, entries, cqe_size, &cqb,
&index, &inlen);
if (err)