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([2a09:bac1:2880:f0::2e0:b5]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-46fab4e22d8sm33204695e9.5.2025.10.09.03.23.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Oct 2025 03:23:01 -0700 (PDT) From: Matt Fleming To: Theodore Ts'o Cc: adilger.kernel@dilger.ca, jack@suse.cz, kernel-team@cloudflare.com, libaokun1@huawei.com, linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, willy@infradead.org Subject: Re: ext4 writeback performance issue in 6.12 Date: Thu, 9 Oct 2025 11:22:59 +0100 Message-Id: <20251009102259.529708-1-matt@readmodwrite.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251008162655.GB502448@mit.edu> References: <20251006115615.2289526-1-matt@readmodwrite.com> <20251008150705.4090434-1-matt@readmodwrite.com> <20251008162655.GB502448@mit.edu> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: 8bit On Wed, Oct 08, 2025 at 12:26:55PM -0400, Theodore Ts'o wrote: > On Wed, Oct 08, 2025 at 04:07:05PM +0100, Matt Fleming wrote: > > > > > > These machines are striped and are using noatime: > > > > > > $ grep ext4 /proc/mounts > > > /dev/md127 /state ext4 rw,noatime,stripe=1280 0 0 > > > > > > Is there some tunable or configuration option that I'm missing that > > > could help here to avoid wasting time in > > > ext4_mb_find_good_group_avg_frag_lists() when it's most likely going to > > > fail an order 9 allocation anyway? > > Can you try disabling stripe parameter? If you are willing to try the > latest mainline kernel, there are some changes that *might* make a > different, but RAID stripe alignment has been causing problems. Thanks Ted. I'm going to try disabling the stripe parameter now. I'll report back shortly.