[Cluster-devel] gfs2 write bandwidth regression on 6.4-rc3 compareto 5.15.y

[Wang Yugui <wangyugui@e16-tech.com>]

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 at e16-tech.com/
[2] https://lore.kernel.org/linux-xfs/20230520163603.1794256-1-willy at infradead.org/


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)

Best Regards
Wang Yugui (wangyugui at e16-tech.com)
2023/05/23