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Date: Fri, 29 Jul 2022 07:30:25 +0200 From: Stefan Wahren <stefan.wahren@...e.com> To: Jan Kara <jack@...e.cz> Cc: linux-ext4@...r.kernel.org, Ojaswin Mujoo <ojaswin@...ux.ibm.com>, Harshad Shirwadkar <harshadshirwadkar@...il.com>, Theodore Ts'o <tytso@....edu>, Ritesh Harjani <riteshh@...ux.ibm.com>, linux-fsdevel@...r.kernel.org, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Geetika.Moolchandani1@....com, regressions@...ts.linux.dev Subject: Re: [Regression] ext4: changes to mb_optimize_scan cause issues on Raspberry Pi Hi Jan, Am 28.07.22 um 12:00 schrieb Jan Kara: > Hello! > Can you run "iostat -x 1" while the download is running so that we can see > roughly how the IO pattern looks? > > Also can get filesystem metadata image of your card like: > e2image -r <fs-device> - | gzip >/tmp/ext4-image.gz > > and put it somewhere for download? The image will contain only fs metadata, > not data so it should be relatively small and we won't have access to your > secrets ;). With the image we'd be able to see how the free space looks > like and whether it perhaps does not trigger some pathological behavior. > > My current suspicion is that because the new allocator strategy spreads > allocations over more block groups, we end up with more open erase blocks > on the SD card which forces the firmware to do more garbage collection and > RMW of erase blocks and write performance tanks... > > Thanks. thanks for your feedback. Unfortunately i'm busy the next days, so it will take some time to provide this. > Honza >
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