From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:47552 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754592AbcKUQb6 (ORCPT ); Mon, 21 Nov 2016 11:31:58 -0500 Subject: Patch "IB/mlx5: Use cache line size to select CQE stride" has been added to the 4.8-stable tree To: danielj@mellanox.com, dledford@redhat.com, gregkh@linuxfoundation.org, leon@kernel.org, maorg@mellanox.com Cc: , From: Date: Mon, 21 Nov 2016 17:29:33 +0100 Message-ID: <147974577313126@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled IB/mlx5: Use cache line size to select CQE stride to the 4.8-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ib-mlx5-use-cache-line-size-to-select-cqe-stride.patch and it can be found in the queue-4.8 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 16b0e0695a73b68d8ca40288c8f9614ef208917b Mon Sep 17 00:00:00 2001 From: Daniel Jurgens Date: Thu, 27 Oct 2016 16:36:41 +0300 Subject: IB/mlx5: Use cache line size to select CQE stride From: Daniel Jurgens commit 16b0e0695a73b68d8ca40288c8f9614ef208917b upstream. 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 Signed-off-by: Maor Gottlieb Signed-off-by: Leon Romanovsky Signed-off-by: Doug Ledford Signed-off-by: Greg Kroah-Hartman --- drivers/infiniband/hw/mlx5/cq.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/drivers/infiniband/hw/mlx5/cq.c +++ b/drivers/infiniband/hw/mlx5/cq.c @@ -917,8 +917,7 @@ struct ib_cq *mlx5_ib_create_cq(struct i 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) Patches currently in stable-queue which might be from danielj@mellanox.com are queue-4.8/ib-mlx5-use-cache-line-size-to-select-cqe-stride.patch queue-4.8/ib-mlx4-check-gid_index-return-value.patch queue-4.8/ib-mlx4-fix-create-cq-error-flow.patch