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Wed, 28 Jul 2021 15:17:28 +0000 (UTC) Received: from T590 (ovpn-12-35.pek2.redhat.com [10.72.12.35]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 27C7A1971B; Wed, 28 Jul 2021 15:17:19 +0000 (UTC) Date: Wed, 28 Jul 2021 23:17:20 +0800 From: Ming Lei To: John Garry Cc: Robin Murphy , linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, iommu@lists.linux-foundation.org, Will Deacon , linux-arm-kernel@lists.infradead.org Subject: Re: [bug report] iommu_dma_unmap_sg() is very slow then running IO from remote numa node Message-ID: References: <9c929985-4fcb-e65d-0265-34c820b770ea@huawei.com> <0adbe03b-ce26-e4d3-3425-d967bc436ef5@arm.com> <6ceab844-465f-3bf3-1809-5df1f1dbbc5c@huawei.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210728_081734_862782_F8BA5481 X-CRM114-Status: GOOD ( 25.72 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Jul 28, 2021 at 11:38:18AM +0100, John Garry wrote: > On 28/07/2021 02:32, Ming Lei wrote: > > On Mon, Jul 26, 2021 at 3:51 PM John Garry wrote: > > > On 23/07/2021 11:21, Ming Lei wrote: > > > > > Thanks, I was also going to suggest the latter, since it's what > > > > > arm_smmu_cmdq_issue_cmdlist() does with IRQs masked that should be most > > > > > indicative of where the slowness most likely stems from. > > > > The improvement from 'iommu.strict=0' is very small: > > > > > > > Have you tried turning off the IOMMU to ensure that this is really just > > > an IOMMU problem? > > > > > > You can try setting CONFIG_ARM_SMMU_V3=n in the defconfig or passing > > > cmdline param iommu.passthrough=1 to bypass the the SMMU (equivalent to > > > disabling for kernel drivers). > > Bypassing SMMU via iommu.passthrough=1 basically doesn't make a difference > > on this issue. > > A ~90% throughput drop still seems to me to be too high to be a software > issue. More so since I don't see similar on my system. And that throughput > drop does not lead to a total CPU usage drop, from the fio log. > > Do you know if anyone has run memory benchmark tests on this board to find > out NUMA effect? I think lmbench or stream could be used for this. https://lore.kernel.org/lkml/YOhbc5C47IzC893B@T590/ -- Ming _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel