Re: [gentoo-user] XFS FileSystem - Slow Writes

["Richard Fish" <bigfish@asmallpond.org>]

On 8/28/06, Ow Mun Heng <Ow.Mun.Heng@wdc.com> wrote:
> Has anyone here, who uses XFS fs, experiencing slow filesystem writes?
> I'm seeing throughput of like 4-3MB/s instead of like previously
> 15-20MB/s.
> I have read that there was some thing about "barriers" and I've tried
> re-mounting the FS w/ "nobarriers" but the performance didn't improve.

Hmm, nothing that I have seen.  I'm running 2.6.18-rc2.  My xfs
settings look like:

carcharias rjf # sysctl -a | grep xfs
fs.xfs.stats_clear = 0
fs.xfs.inherit_nodefrag = 1
fs.xfs.rotorstep = 1
fs.xfs.inherit_nosymlinks = 0
fs.xfs.age_buffer_centisecs = 1500
fs.xfs.xfsbufd_centisecs = 100
fs.xfs.inherit_noatime = 1
fs.xfs.inherit_nodump = 1
fs.xfs.inherit_sync = 1
fs.xfs.xfssyncd_centisecs = 500
fs.xfs.error_level = 3
fs.xfs.panic_mask = 0
fs.xfs.irix_symlink_mode = 0
fs.xfs.irix_sgid_inherit = 0
fs.xfs.restrict_chown = 1

I would make sure you are not mounting with the sync option, or have
anything with the sync flag set (chattr/lsattr).  I have seen that
result in performance like you describe...

-Richard
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