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AJvYcCUzcdnMc/X7Sm1R9+Z9DA/CGK1SxoMrT4Dj9YtEvOEceakYFncayvXQlonezm0IjZdJJLFWndjBMhkM9jU=@vger.kernel.org X-Gm-Message-State: AOJu0YzexDzTjNT9wZMK/Thqf4EZ8RwAyiPEzcgayTiegMlgzDkWgYnC u8D/LSQdZuH0WSjP6SIJ4K683191r5n8SRACb+y2lf8H+VgsBAP8d+/rezdp8N8= X-Google-Smtp-Source: AGHT+IG0ksmejkYn/tsWOFj5UDq65mB5fTjw0uagwhlJwyCNesDEnrmSpfLQj8+GbqVblFhVpBgdOw== X-Received: by 2002:a05:6602:15d4:b0:83a:c242:82aa with SMTP id ca18e2360f4ac-83b1c5cd123mr2127656539f.13.1730396530549; Thu, 31 Oct 2024 10:42:10 -0700 (PDT) Received: from [192.168.1.116] ([96.43.243.2]) by smtp.gmail.com with ESMTPSA id ca18e2360f4ac-83b67b4b157sm40604339f.22.2024.10.31.10.42.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 31 Oct 2024 10:42:09 -0700 (PDT) Message-ID: <2a0fc88a-53af-4d7e-b8fd-8cee3f0804a1@kernel.dk> Date: Thu, 31 Oct 2024 11:42:07 -0600 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 00/17] Provide a new two step DMA mapping API To: Christoph Hellwig Cc: Leon Romanovsky , Jason Gunthorpe , Robin Murphy , Joerg Roedel , Will Deacon , Sagi Grimberg , Keith Busch , Bjorn Helgaas , Logan Gunthorpe , Yishai Hadas , Shameer Kolothum , Kevin Tian , Alex Williamson , Marek Szyprowski , =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= , 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 References: <3144b6e7-5c80-46d2-8ddc-a71af3c23072@kernel.dk> <20241031083450.GA30625@lst.de> Content-Language: en-US From: Jens Axboe In-Reply-To: <20241031083450.GA30625@lst.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 10/31/24 2:34 AM, Christoph Hellwig wrote: > 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. That's fine, just wanted to ensure that no push was being done on this before that was resolved. -- Jens Axboe