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([2620:15c:211:201:30f3:595a:48e5:cb41]) by smtp.gmail.com with ESMTPSA id h18-20020aa786d2000000b005e00086250asm100939pfo.125.2023.03.02.12.30.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 02 Mar 2023 12:30:50 -0800 (PST) Message-ID: Date: Thu, 2 Mar 2023 12:30:47 -0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.7.1 Subject: Re: [LSF/MM/BPF TOPIC] Cloud storage optimizations Content-Language: en-US To: Theodore Ts'o , lsf-pc@lists.linux-foundation.org Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-block@vger.kernel.org References: From: Bart Van Assche In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: A262AC0014 X-Stat-Signature: ngb47p3nkuscz4qpxqmhnxmaxpz698ab X-HE-Tag: 1677789052-754189 X-HE-Meta: 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 qGe/Ohqe 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000002, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 2/28/23 19:52, Theodore Ts'o wrote: > Unfortunately most common storage devices have > not supported write hints, and support for write hints were ripped out > last year. Work is ongoing in T10 to add write hint support to SBC. We plan to propose to restore write hint support after there is agreement in T10 about the approach. See also "Constrained SBC-5 Streams" (http://www.t10.org/cgi-bin/ac.pl?t=d&f=23-024r0.pdf). This proposal has been uploaded yesterday. Bart.