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From: Kent Overstreet To: Linus Torvalds 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 Subject: Re: [LSF/MM/BPF TOPIC] Measuring limits and enhancing buffered IO Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Migadu-Flow: FLOW_OUT X-Rspam-User: X-Stat-Signature: fhuubneqk884nqkb9m1bdwye7kso7fs7 X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 99C0EC0017 X-HE-Tag: 1709054412-968637 X-HE-Meta: U2FsdGVkX1/mR5xdDEKoYfQHpndaVoIIIiFZxU1GYhnY1psxj8gCm781U/1AF/72a7JY0/tUSVeyVQD952p/hTh1/3t/YCWVbXTQlXry67/vl8Smy+rEeyUn4+kSbibzAFQQRE9rTdKSqYQ7PV0TT34eEa1xjCpH8mHE7i3IYfRqySxN8bXepSbh4JK/uaky/6nstNQg1+TUJf64NqLQqGfol+DPVnHlLCEFpqbJ5vxYDz18ARH2162XvwGC5yr+wy8DTydrNjYr67nQLEpx6UpThCkfs6pOdrhysYUy8uKdd4o2ZaCeBb+9AnTkH4qWKLVQIuVqONOqfUK/ieCl5BTasnOmGj/Yq1xN9PO2zW/RUC1dxY7u6TRSuOt0SxE/pej5x+y5/zcHPItAuJEBhl2L02LxBsT5WOdP3IIXLUqY7yLGVLDcekDujYPiqhrRBsm6ry0LX9+G5lk7MBCMM4bibkhEWICNxftlge4Pgfz6GVkAuAD4gZ/b2Qv6iBGxg90hYWHGH0KZBcQa/TTxlbkPER22j5rJff1RQQX09VaBYnd7J+A5IkUGI652Td/NIDsSIcUoaQree/be2Tc8hHEUW1exQHAZLuL3wYPXwcUVdv9MCcWhaBlwqwsmm7JC5tnHUdacxnbnOciwXhwgCTOAB2r6nb/POz+qpIQ4Mg7wV4X7d9ejIpHEyZQpk4DUWAUul+SwPy9d5WT1BtpYIIWxtAeeYuvLtpPrRvLgDxUtt8/vVrpRwJs6Q4vMbssuhEEkoXm3EXpYTeOw2HV6LXJvMJHV2Ory+2LS7Fycb1k= 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, Feb 27, 2024 at 09:07:01AM -0800, Linus Torvalds wrote: > 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 fio \ --group_reporting \ --gtod_reduce=1 \ --norandommap \ --runtime=60s \ --exitall_on_error=1 \ --filename=/root/foo \ --name=read \ --rw=randread \ --loops=100 \ --numjobs=8 \ --filesize=1G \ --bs=64b \ --io_size=10G