Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752598AbdHIDYT (ORCPT ); Tue, 8 Aug 2017 23:24:19 -0400 Received: from mail-wm0-f67.google.com ([74.125.82.67]:36154 "EHLO mail-wm0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752356AbdHIDYS (ORCPT ); Tue, 8 Aug 2017 23:24:18 -0400 MIME-Version: 1.0 In-Reply-To: <598A6877.4050307@huawei.com> References: <20170726110807.GN15833@8bytes.org> <59787A48.6060200@huawei.com> <598A6877.4050307@huawei.com> From: Ganapatrao Kulkarni Date: Wed, 9 Aug 2017 08:54:16 +0530 Message-ID: Subject: Re: [PATCH v2 0/4] Optimise 64-bit IOVA allocations To: "Leizhen (ThunderTown)" Cc: Joerg Roedel , Robin Murphy , Lorenzo Pieralisi , ard.biesheuvel@linaro.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, ray.jui@broadcom.com, nwatters@codeaurora.org, Jonathan.Cameron@huawei.com, dwmw2@infradead.org, linux-arm-kernel@lists.infradead.org, Ganapatrao Kulkarni Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3224 Lines: 96 On Wed, Aug 9, 2017 at 7:12 AM, Leizhen (ThunderTown) wrote: > > > On 2017/8/8 20:03, Ganapatrao Kulkarni wrote: >> On Wed, Jul 26, 2017 at 4:47 PM, Leizhen (ThunderTown) >> wrote: >>> >>> >>> On 2017/7/26 19:08, Joerg Roedel wrote: >>>> Hi Robin. >>>> >>>> On Fri, Jul 21, 2017 at 12:41:57PM +0100, Robin Murphy wrote: >>>>> Hi all, >>>>> >>>>> In the wake of the ARM SMMU optimisation efforts, it seems that certain >>>>> workloads (e.g. storage I/O with large scatterlists) probably remain quite >>>>> heavily influenced by IOVA allocation performance. Separately, Ard also >>>>> reported massive performance drops for a graphical desktop on AMD Seattle >>>>> when enabling SMMUs via IORT, which we traced to dma_32bit_pfn in the DMA >>>>> ops domain getting initialised differently for ACPI vs. DT, and exposing >>>>> the overhead of the rbtree slow path. Whilst we could go around trying to >>>>> close up all the little gaps that lead to hitting the slowest case, it >>>>> seems a much better idea to simply make said slowest case a lot less slow. >>>> >>>> Do you have some numbers here? How big was the impact before these >>>> patches and how is it with the patches? >>> Here are some numbers: >>> >>> (before)$ iperf -s >>> ------------------------------------------------------------ >>> Server listening on TCP port 5001 >>> TCP window size: 85.3 KByte (default) >>> ------------------------------------------------------------ >>> [ 4] local 192.168.1.106 port 5001 connected with 192.168.1.198 port 35898 >>> [ ID] Interval Transfer Bandwidth >>> [ 4] 0.0-10.2 sec 7.88 MBytes 6.48 Mbits/sec >>> [ 5] local 192.168.1.106 port 5001 connected with 192.168.1.198 port 35900 >>> [ 5] 0.0-10.3 sec 7.88 MBytes 6.43 Mbits/sec >>> [ 4] local 192.168.1.106 port 5001 connected with 192.168.1.198 port 35902 >>> [ 4] 0.0-10.3 sec 7.88 MBytes 6.43 Mbits/sec >>> >>> (after)$ iperf -s >>> ------------------------------------------------------------ >>> Server listening on TCP port 5001 >>> TCP window size: 85.3 KByte (default) >>> ------------------------------------------------------------ >>> [ 4] local 192.168.1.106 port 5001 connected with 192.168.1.198 port 36330 >>> [ ID] Interval Transfer Bandwidth >>> [ 4] 0.0-10.0 sec 1.09 GBytes 933 Mbits/sec >>> [ 5] local 192.168.1.106 port 5001 connected with 192.168.1.198 port 36332 >>> [ 5] 0.0-10.0 sec 1.10 GBytes 939 Mbits/sec >>> [ 4] local 192.168.1.106 port 5001 connected with 192.168.1.198 port 36334 >>> [ 4] 0.0-10.0 sec 1.10 GBytes 938 Mbits/sec >>> >> >> Is this testing done on Host or on Guest/VM? > Host As per your log, iperf throughput is improved to 938 Mbits/sec from 6.43 Mbits/sec. IMO, this seems to be unrealistic, some thing wrong with the testing? > >> >>>> >>>> >>>> Joerg >>>> >>>> >>>> . >>>> >>> >>> -- >>> Thanks! >>> BestRegards >>> >>> >>> _______________________________________________ >>> linux-arm-kernel mailing list >>> linux-arm-kernel@lists.infradead.org >>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel >> >> thanks >> Ganapat >> >> . >> > > -- > Thanks! > BestRegards > thanks Ganapat