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[173.79.40.147]) by smtp.gmail.com with ESMTPSA id ow1-20020a0562143f8100b0068c8be959a0sm7687874qvb.111.2024.03.06.08.51.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 06 Mar 2024 08:51:51 -0800 (PST) Message-ID: Date: Wed, 6 Mar 2024 11:51:50 -0500 Precedence: bulk X-Mailing-List: fio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: fio version change gives different throughput results To: Thomas Weber , "fio@vger.kernel.org" References: <3309778342f6bfdefe0b7a1de1fcddab10902c37.camel@de.ibm.com> <706651ae-3f53-4cc6-aa06-43a49f8e2078@gmail.com> <064bbd4dc5db416092090ce568ef8759744f46f0.camel@de.ibm.com> Content-Language: en-US From: Vincent Fu In-Reply-To: <064bbd4dc5db416092090ce568ef8759744f46f0.camel@de.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 3/6/24 04:44, Thomas Weber wrote: > > Thank you. I noticed that fix as well in the fio changelog. > From the description it seems to affect only non-sequential IO. > However I saw huge throughput degradations for both rw=rw and > rw=randrw. > > Do you think this is related to that bug fix too? > > [smallstuff-seq-slow] > rw=rw > nrfiles=1000 > openfiles=25 > filesize=1k-1m > bssplit=4k/20:128k/80 > rwmixread=60 > > [smallstuff-rand-slow] > rw=randrw > nrfiles=1000 > openfiles=25 > filesize=1k-1m > bssplit=4k/50:8k/25:64k/25 > rwmixread=75 > The patch description mentions file_service_type != sequential but makes no comment about whether offsets are chosen randomly or sequentially. In fact the example job in the patch description chooses offsets randomly. I tried your smallstuff-seq-slow job and found the following: fio-3.25+ [1]:----- 424 MiB/s read, 384 MiB/s write fio-3.36:---------- 384 MiB/s read, 347 MiB/s write fio-3.36-97-g9b699: 517 MiB/s read, 467 MiB/s write [1] fio-3.25 needs 382975557e632efb506836bc1709789e615c9094 to build with recent kernels If you are able to reliably reproduce the problem I suggest that you run git bisect to identify the commit responsible for the difference you have observed. Vincent