Re: [PATCH v2 00/16] Parallelizing filesystem writeback

Jan Kara
2025-10-21T12:12:02Z

On Tue 21-10-25 16:06:22, Kundan Kumar wrote:
> Previous results of fragmentation were taken with randwrite. I took
> fresh data for sequential IO and here are the results.
> number of extents reduces a lot for seq IO:
> A) Workload 6 files each 1G in single directory(AG) - numjobs = 1
> Base XFS : 1
> Parallel Writeback XFS : 1
>
> B) Workload 12 files each of 1G to 12 directories(AGs)- numjobs = 12
> Base XFS : 4
> Parallel Writeback XFS : 3
>
> C) Workload 6 files each of 20G to 6 directories(AGs) - numjobs = 6
> Base XFS : 4
> Parallel Writeback XFS : 4

Thanks for sharing details! I'm curious: how big differences in throughput
did you see between normal and parallel writeback with sequential writes?

Honza
--
Jan Kara <jack@suse.com>
SUSE Labs, CR