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Tue, 21 Oct 2025 12:11:51 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id ccUdM4d492iSaAAAD6G6ig (envelope-from ); Tue, 21 Oct 2025 12:11:51 +0000 Received: by quack3.suse.cz (Postfix, from userid 1000) id 6211BA0990; Tue, 21 Oct 2025 14:11:47 +0200 (CEST) Date: Tue, 21 Oct 2025 14:11:47 +0200 From: Jan Kara To: Kundan Kumar Cc: Dave Chinner , jaegeuk@kernel.org, chao@kernel.org, viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz, miklos@szeredi.hu, agruenba@redhat.com, trondmy@kernel.org, anna@kernel.org, akpm@linux-foundation.org, willy@infradead.org, mcgrof@kernel.org, clm@meta.com, amir73il@gmail.com, axboe@kernel.dk, hch@lst.de, ritesh.list@gmail.com, djwong@kernel.org, dave@stgolabs.net, wangyufei@vivo.com, linux-f2fs-devel@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, gfs2@lists.linux.dev, linux-nfs@vger.kernel.org, linux-mm@kvack.org, gost.dev@samsung.com, anuj20.g@samsung.com, vishak.g@samsung.com, joshi.k@samsung.com Subject: Re: [PATCH v2 00/16] Parallelizing filesystem writeback Message-ID: References: <20251014120845.2361-1-kundan.kumar@samsung.com> <6fe26b74-beb9-4a6a-93af-86edcbde7b68@samsung.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <6fe26b74-beb9-4a6a-93af-86edcbde7b68@samsung.com> X-Rspamd-Server: rspam01 X-Stat-Signature: 4xyne3bpa9td9twizod5igucyw7mbuz7 X-Rspam-User: X-Rspamd-Queue-Id: 9CE0B4000D X-HE-Tag: 1761048721-872615 X-HE-Meta: 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 rvhD80zV D3XefrY/P/XdWmR+oTPhKDyR2egzT82VMyldSFcuZ0n9FPJPnPYnQXPJUvLJShXjj9s2VW0Bq2+tzdT65Xd1R5RhRz77YVi5QTaVNjAZ3mB9JrJ9SSCqVxSX+z5F04Wd3eEIFlJ5hOry6l/wwylurnDFOFGRQwYBr3d276Hc5dQNbOWQ5egtgYMnPnR3/ijmbi+fmIJ7jRb8mUMFd1werzKMzMyqLf49W3es1wHeEynovt7sAQ/3YEO4tYMy7d+CHyarFhesezzcJBw0PdRi1AoMWynqST1jBOzoyYKASyrIOKWP6mZjKqYIGLj2AzOfMrCeQ4bRY08jbBTy5BzUVsHNG9nVylenNiTjds33DHcdDd9Kgiw2ShSm2l4isSH9IK1sFlq5Mx5GdndBm6mVhfGxJgDvw9Neoq/Pd 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 21-10-25 16:06:22, Kundan Kumar wrote: > Previous results of fragmentation were taken with randwrite. I took > fresh data for sequential IO and here are the results. > number of extents reduces a lot for seq IO: > A) Workload 6 files each 1G in single directory(AG) - numjobs = 1 > Base XFS : 1 > Parallel Writeback XFS : 1 > > B) Workload 12 files each of 1G to 12 directories(AGs)- numjobs = 12 > Base XFS : 4 > Parallel Writeback XFS : 3 > > C) Workload 6 files each of 20G to 6 directories(AGs) - numjobs = 6 > Base XFS : 4 > Parallel Writeback XFS : 4 Thanks for sharing details! I'm curious: how big differences in throughput did you see between normal and parallel writeback with sequential writes? Honza -- Jan Kara SUSE Labs, CR