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[209.85.218.52]) by smtp.gmail.com with ESMTPSA id m16-20020a170906235000b00a3d153fba90sm937693eja.220.2024.02.27.09.07.18 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 27 Feb 2024 09:07:18 -0800 (PST) Received: by mail-ej1-f52.google.com with SMTP id a640c23a62f3a-a3f3d0d2787so467533766b.3 for ; Tue, 27 Feb 2024 09:07:18 -0800 (PST) X-Forwarded-Encrypted: i=1; AJvYcCWnKGElt/GSLtLeDUN25sW0DQsDK+59HLE9QgiX1IBlOOqps6sXip5g3mU9h6rUAIYW8P18FzHsDsjjfCN75hFjNKU= X-Received: by 2002:a17:906:c350:b0:a43:82d0:38f4 with SMTP id ci16-20020a170906c35000b00a4382d038f4mr3423215ejb.11.1709053638529; Tue, 27 Feb 2024 09:07:18 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Linus Torvalds Date: Tue, 27 Feb 2024 09:07:01 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [LSF/MM/BPF TOPIC] Measuring limits and enhancing buffered IO To: Kent Overstreet Cc: Al Viro , Matthew Wilcox , Luis Chamberlain , lsf-pc@lists.linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-mm , Daniel Gomez , Pankaj Raghav , Jens Axboe , Dave Chinner , Christoph Hellwig , Chris Mason , Johannes Weiner Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 7277240022 X-Stat-Signature: nocbdzxw4k7zm4qyjn6s9xodahfqa13j X-Rspam-User: X-HE-Tag: 1709053641-78668 X-HE-Meta: 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 Q72cTr1T uv09Om1Av0Zg+8E8T+tBBYj4waWXieiUuPeitXGII3mt0HC9YIb8hBkmJACeUYqTAnABGFiILwziVBkgfjSm/oNbsUZMzSYk1HDgZH7ZiLIYKC8X5p8ZfTFck512HsNlgr1LywKmWUsWH0+mejitg/Z8zl0muaiB7EYOYowDt1VazaazTmOqSrBG2h18al+Yvor5qb4QD+R0huZ0Yt4+uh/BmVpoTLnyBB7anOcKceGZeWToX8DRgUdRwPq4darxZr7ILE1jlSNW7Ju4GJ2e6etgXpNudCi/Lo8g3EY1At46EcjzGtKz87UQQgI0/MzPDKR57v1YR0fiSfaAqB09SzeR2LlhBhQWlmCyvMfIvuhQwrH6BlZK0QE0iaNiN5WXjwpY0OaeRaX4YhHAN4e7UK6g+J07VMrx4RLYrA9HYc6YLu17PolPZFGpIcpjd2XAHDD4G9iL7m7aMGdQrgsHEm93SHPN5qb4QXT0spRcYF6I1yGQI9bl6Gc40rKfb9kEYtAq2d+UrUU7a6732gOeOv/8Zfw== 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 Tue, 27 Feb 2024 at 08:47, Kent Overstreet wrote: > > Like I replied to willy - the "4k" was a typo from force of habit, I was > doing 64 byte random reads. Ok, can you send the exact fio command? I'll do some testing here too. Linus