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h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=+1W5ztuKBvbZRuqjnT62E662/+w04qJuoAip5s1KGYk=; b=0feUNdwmvqxFRnSu58z4ZpAI5R1HcIFAcHdzinZPT6gPTM3Mqj50U1xvsEDmV4BBSsRWBL 4CZvgfnCH8WjWu3qGK8cPIbuS3J8IxNMWYeEKroqtheKvJ2QA7r4mVHcjhlrnVNG5WKUPg +2ZY9C8tIgAc2C0Yy9MslTdghFTTQW8= Received: by verein.lst.de (Postfix, from userid 2407) id 86DED68AA6; Thu, 31 Oct 2024 09:34:50 +0100 (CET) Date: Thu, 31 Oct 2024 09:34:50 +0100 From: Christoph Hellwig To: Jens Axboe Cc: Leon Romanovsky , Jason Gunthorpe , Robin Murphy , Joerg Roedel , Will Deacon , Christoph Hellwig , Sagi Grimberg , Keith Busch , Bjorn Helgaas , Logan Gunthorpe , Yishai Hadas , Shameer Kolothum , Kevin Tian , Alex Williamson , Marek Szyprowski , =?iso-8859-1?B?Suly9G1l?= Glisse , Andrew Morton , Jonathan Corbet , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-rdma@vger.kernel.org, iommu@lists.linux.dev, linux-nvme@lists.infradead.org, linux-pci@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v1 00/17] Provide a new two step DMA mapping API Message-ID: <20241031083450.GA30625@lst.de> References: <3144b6e7-5c80-46d2-8ddc-a71af3c23072@kernel.dk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3144b6e7-5c80-46d2-8ddc-a71af3c23072@kernel.dk> User-Agent: Mutt/1.5.17 (2007-11-01) X-Rspam-User: X-Rspamd-Queue-Id: E8CB41C0016 X-Rspamd-Server: rspam11 X-Stat-Signature: 8z66uqzd7gubbhhai4zbghh8txqsutrj X-HE-Tag: 1730363644-245873 X-HE-Meta: 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 UbshgjOe 5404K2rDL0QRrj1AmJWSAaHeAqT6ieG2JoElFKP2wsdZxREZ2vCkkZphV2E/bmGsZjqzpBDvIhvTtNT4= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Oct 30, 2024 at 07:44:13PM -0600, Jens Axboe wrote: > On Christoph's request, I tested this series last week and saw some > pretty significant performance regressions on my box. I don't know what > the status is in terms of that, just want to make sure something like > this doesn't get merged until that is both fully understood and sorted > out. Working on it, but I have way too many things going on at once. Note that the weird thing about your setup was that we apparently dropped into the slow path, which still puzzles me. But I should probably also look into making that path a little less slow.