From mboxrd@z Thu Jan 1 00:00:00 1970 From: "jianchao.wang" Subject: Re: [PATCH] net/mlx4_en: ensure rx_desc updating reaches HW before prod db updating Date: Thu, 25 Jan 2018 11:27:17 +0800 Message-ID: <532b4d71-e2eb-35f3-894e-1c3288e7bc3f@oracle.com> References: <1515728542-3060-1-git-send-email-jianchao.w.wang@oracle.com> <20180112163247.GB15974@ziepe.ca> <1515775567.131759.42.camel@gmail.com> <53b1ac4d-a294-eb98-149e-65d7954243da@oracle.com> <1516376999.3606.39.camel@gmail.com> <339a7156-9ef1-1f3c-30b8-3cc3558d124e@mellanox.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Content-Language: en-US Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Tariq Toukan , Eric Dumazet , Jason Gunthorpe Cc: junxiao.bi-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org, netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Saeed Mahameed List-Id: linux-rdma@vger.kernel.org Hi Tariq On 01/22/2018 10:12 AM, jianchao.wang wrote: >>> On 19/01/2018 5:49 PM, Eric Dumazet wrote: >>>> On Fri, 2018-01-19 at 23:16 +0800, jianchao.wang wrote: >>>>> Hi Tariq >>>>> >>>>> Very sad that the crash was reproduced again after applied the patch. >> Memory barriers vary for different Archs, can you please share more details regarding arch and repro steps? > The hardware is HP ProLiant DL380 Gen9/ProLiant DL380 Gen9, BIOS P89 12/27/2015 > The xen is installed. The crash occurred in DOM0. > Regarding to the repro steps, it is a customer's test which does heavy disk I/O over NFS storage without any guest. > What is the finial suggestion on this ? If use wmb there, is the performance pulled down ? Thanks in advance Jianchao -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html