Re: [CFT] Improved ZFS metaslab code (faster write speed)

on 28/08/2010 04:24 jhell said the following:
> 	I must have missed the uma defrag patches but according to the code
> those patches should not have any effect on your implimentation of ZFS
> on your system because vfs.zfs.zio.use_uma defaults to off unless you
> have manually turned this on or the patch reverts that facility back to
> its original form.

ZFS uses UMA even for other things besides ARC and those are not controlled by
vfs.zfs.zio.use_uma.  Those zones also happen to be the most fragmented ones for
me.  To name a few: dnode_t, dmu_buf_impl_t, arc_buf_hdr_t.
So the patch should help there.

-- 
Andriy Gapon