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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210204193431.68E5.409509F4@e16-tech.com> Content-Type: text/plain; charset=gbk Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On 4.02.21 §Ô. 13:34 §é., Wang Yugui wrote: > Hi, > >> On 4.02.21 §Ô. 5:17 §é., Wang Yugui wrote: >>> Hi, >>> >>> I tried to run btrfs misc-next(5.11-rc6 +81patches) based on linux LTS >>> 5.10.12 with the same other kernel components and the same kernel config. >>> >>> Better dbench(sync open) result on both Throughput and max_latency. >>> >> >> If i understand correctly you rebased current misc-next to 5.10.12, if >> so this means there is something else in the main kernel, that's not >> btrfs related which degrades performance, it seems you've got a 300ms >> win by running on 5.10 as compared on 5.11-rc6-based misc next, is that >> right? > > Yes. I just realized this could also be caused by btrfs code that has already landed in v5.11-rc1 for example. I.e the main pull req for this release. > > maybye some code rather than btrfs in main kernel 5.11.rc6 have degrades > performance. > or maybe just because of different kernel config. > kernel config I used: > https://kojipkgs.fedoraproject.org/packages/kernel/5.11.0/0.rc6.141.eln108/ > https://kojipkgs.fedoraproject.org/packages/kernel/5.10.12/200.fc33/ > > I rebased current misc-next to 5.10.12, so that there is only diff in > btrfs source code. > > only 3 minor patch needed for this rebase, there seems no broken kernel API > change for btrfs between 5.10 and 5.11. > # add-to-5.10 0001-block-add-a-bdev_kobj-helper.patch > # drop-from-btrs-misc-next 0001-block-remove-i_bdev.patch > # fix-to-btrfs-misc-next 0001-btrfs-bdev_nr_sectors.patch > > more patch come into misc-next today, they are yet not rebased/tested. > > Best Regards > Wang Yugui (wangyugui@e16-tech.com) > 2021/02/04 >