Hi, > Hi, > > gfs2 write bandwidth regression on 6.4-rc3 compare to 5.15.y. > > we added linux-xfs@ and linux-fsdevel@ because some related problem[1] > and related patches[2]. > > we compared 6.4-rc3(rather than 6.1.y) to 5.15.y becasue some related patches[2] > work only for 6.4 now. > > [1] https://lore.kernel.org/linux-xfs/20230508172406.1CF3.409509F4@xxxxxxxxxxxx/ > [2] https://lore.kernel.org/linux-xfs/20230520163603.1794256-1-willy@xxxxxxxxxxxxx/ > > > test case: > 1) PCIe3 SSD *4 with LVM > 2) gfs2 lock_nolock > gfs2 attr(T) GFS2_AF_ORLOV > # chattr +T /mnt/test > 3) fio > fio --name=global --rw=write -bs=1024Ki -size=32Gi -runtime=30 -iodepth 1 > -ioengine sync -zero_buffers=1 -direct=0 -end_fsync=1 -numjobs=1 \ > -name write-bandwidth-1 -filename=/mnt/test/sub1/1.txt \ > -name write-bandwidth-2 -filename=/mnt/test/sub2/1.txt \ > -name write-bandwidth-3 -filename=/mnt/test/sub3/1.txt \ > -name write-bandwidth-4 -filename=/mnt/test/sub4/1.txt > 4) patches[2] are applied to 6.4-rc3. > > > 5.15.y result > fio WRITE: bw=5139MiB/s (5389MB/s), > 6.4-rc3 result > fio WRITE: bw=2599MiB/s (2725MB/s) more test result: 5.17.0 WRITE: bw=4988MiB/s (5231MB/s) 5.18.0 WRITE: bw=5165MiB/s (5416MB/s) 5.19.0 WRITE: bw=5511MiB/s (5779MB/s) 6.0.5 WRITE: bw=3055MiB/s (3203MB/s), WRITE: bw=3225MiB/s (3382MB/s) 6.1.30 WRITE: bw=2579MiB/s (2705MB/s) so this regression happen in some code introduced in 6.0, and maybe some minor regression in 6.1 too? Best Regards Wang Yugui (wangyugui@xxxxxxxxxxxx) 2023/05/28
