Hi, > On 4.02.21 г. 5:17 ч., 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. 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 (wangyu...@e16-tech.com) 2021/02/04
