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([2620:0:1000:8411:d9ff:baa2:bd58:437a]) by smtp.gmail.com with ESMTPSA id z3-20020a170903018300b001cfa718039bsm2045190plg.216.2023.12.21.12.33.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 21 Dec 2023 12:33:09 -0800 (PST) Message-ID: <5c356222-fe9e-41b0-b7fe-218fbcde4573@acm.org> Date: Thu, 21 Dec 2023 12:33:08 -0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [LSF/MM/BPF TOPIC] Large block for I/O Content-Language: en-US To: Hannes Reinecke , lsf-pc@lists.linuxfoundation.org Cc: linux-mm@kvack.org, linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, "linux-nvme@lists.infradead.org" References: <7970ad75-ca6a-34b9-43ea-c6f67fe6eae6@iogearbox.net> <4343d07b-b1b2-d43b-c201-a48e89145e5c@iogearbox.net> <03ebbc5f-2ff5-4f3c-8c5b-544413c55257@suse.de> From: Bart Van Assche In-Reply-To: <03ebbc5f-2ff5-4f3c-8c5b-544413c55257@suse.de> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 8D86040025 X-Stat-Signature: 13w53oh6ygn3km99ogz1re4akzh9om3s X-HE-Tag: 1703190791-263083 X-HE-Meta: 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 LGSNi8/z 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000013, 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 12/20/23 07:03, Hannes Reinecke wrote: > I would like to discuss > > Large blocks for I/O > > Since the presentation last year there has been quite some developments > and improvements in some areas, but at the same time a lack of progress > in other areas. > In this presentation/discussion I would like to highlight the current > state of affairs, existing pain points, and future directions of development. > It might be an idea to co-locate it with the MM folks as we do have > quite some overlap with page-cache improvements and hugepage handling. Hi Hannes, I'm interested in this topic. But I'm wondering whether the disadvantages of large blocks will be covered? Some NAND storage vendors are less than enthusiast about increasing the logical block size beyond 4 KiB because it increases the size of many writes to the device and hence increases write amplification. Thanks, Bart.