It works. However, I think the root case is due to the xfs_buf missing?
trace-cmd record -e xfs\*
trace-cmd report > xfs.txt
awk '{print $4}' xfs2.txt |sort -n |uniq -c|sort -n|tail -n 20
14468 xfs_file_splice_write:
16562 xfs_buf_find:
19597 xfs_buf_read:
19634 xfs_buf_get:
21943 xfs_get_blocks_alloc:
23265 xfs_perag_put:
26327 xfs_perag_get:
27853 xfs_ail_locked:
39252 xfs_buf_iorequest:
40187 xfs_ail_delete:
41590 xfs_buf_ioerror:
42523 xfs_buf_hold:
44659 xfs_buf_trylock:
47986 xfs_ail_flushing:
50793 xfs_ilock_nowait:
57585 xfs_ilock:
58293 xfs_buf_unlock:
79977 xfs_buf_iodone:
104165 xfs_buf_rele:
108383 xfs_iunlock:
Could you please give me another hint? :) Thanks!
On 2015年12月02日 05:14, Somnath Roy wrote:
> Sure..The following settings helped me minimizing the effect a bit for the PR
> https://github.com/ceph/ceph/pull/6670
>
>
> sysctl -w fs.xfs.xfssyncd_centisecs=720000
> sysctl -w fs.xfs.xfsbufd_centisecs=3000
> sysctl -w fs.xfs.age_buffer_centisecs=720000
>
> But, for existing Ceph write path you may need to tweak this..
>
> Thanks & Regards
> Somnath
>
> -----Original Message-----
> From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of
> flisky
> Sent: Tuesday, December 01, 2015 11:04 AM
> To: ceph-users@lists.ceph.com
> Subject: Re: [ceph-users] does anyone know what xfsaild and kworker are?they
> make osd disk busy. produce 100-200iops per osd disk?
>
> On 2015年12月02日 01:31, Somnath Roy wrote:
>> This is xfs metadata sync process...when it is waking up and there are lot
>> of data to sync it will throttle all the process accessing the drive...There
>> are some xfs settings to control the behavior, but you can't stop that
> May I ask how to tune the xfs settings? Thanks!
>
> _______________________________________________
> ceph-users mailing list
> ceph-users@lists.ceph.com
> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>
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