here is what i see before prefetch_disable is set, i'm currently moving (mv
/tank/games /tank/fs1 /tank/fs2) .5 GB and larger files from a deduped pool
to another... file copy seems fine but delete's kill performance. b130 OSOL
/dev
0 0 0 6 0 7 0 2 88 1 116 zfs
0 0 0 2 0 4 0 0 0 1 116 zfs
0 0 0 0 0 0 0 0 0 1 116 zfs
0 0 0 6 0 14 0 0 0 1 116 zfs
0 0 0 0 0 0 0 0 0 1 116 zfs
0 0 0 0 0 0 0 0 0 1 116 zfs
0 0 0 0 0 1 0 0 0 4 24.0M zfs
0 0 0 0 0 0 0 0 0 3 16.0M zfs
0 0 0 0 0 0 0 0 0 1 116 zfs
0 0 0 0 0 18 0 0 0 1 116 zfs
new name name attr attr lookup rddir read read write write
file remov chng get set ops ops ops bytes ops bytes
0 0 0 0 0 0 0 0 0 1 116 zfs
0 0 0 0 0 0 0 0 0 1 260 zfs
0 0 0 0 0 0 0 0 0 1 116 zfs
0 0 0 0 0 0 0 0 0 1 116 zfs
0 0 0 0 0 0 0 0 0 1 116 zfs
0 0 0 0 0 0 0 0 0 4 24.0M zfs
0 0 0 2 0 4 0 0 0 4 24.0M zfs
0 0 0 0 0 2 0 0 0 1 116 zfs
with it enabled i see a more consistent result, but probably not any
faster.
new name name attr attr lookup rddir read read write write
file remov chng get set ops ops ops bytes ops bytes
0 0 0 0 0 0 0 0 0 2 8.00M zfs
0 0 0 0 0 0 0 0 0 1 260 zfs
0 0 0 0 0 0 0 0 0 1 116 zfs
0 0 0 0 0 0 0 0 0 1 116 zfs
0 0 0 0 0 0 0 0 0 2 8.00M zfs
0 0 0 6 0 7 0 2 88 2 8.00M zfs
0 0 0 2 0 4 0 0 0 1 116 zfs
0 0 0 0 0 0 0 0 0 2 8.00M zfs
0 0 0 0 0 0 0 0 0 1 116 zfs
0 0 0 0 0 0 0 0 0 2 8.00M zfs
0 0 0 0 0 1 0 0 0 1 116 zfs
0 0 0 0 0 3 0 0 0 2 8.00M zfs
0 0 0 0 0 0 0 0 0 2 8.00M zfs
new name name attr attr lookup rddir read read write write
file remov chng get set ops ops ops bytes ops bytes
0 0 0 0 0 0 0 0 0 1 116 zfs
0 0 0 0 0 0 0 0 0 2 8.00M zfs
0 0 0 0 0 0 0 0 0 2 8.00M zfs
1 0 0 5 0 5 0 2 9.9K 1 116 zfs
0 0 0 0 0 3 0 0 0 1 116 zfs
0 0 0 4 0 7 2 0 0 2 8.00M zfs
James Dickens
On Thu, Dec 24, 2009 at 11:22 PM, Michael Herf <mbh...@gmail.com> wrote:
> FWIW, I just disabled prefetch, and my dedup + zfs recv seems to be
> running visibly faster (somewhere around 3-5x faster).
>
> echo zfs_prefetch_disable/W0t1 | mdb -kw
>
> Anyone else see a result like this?
>
> I'm using the "read" bandwidth from the sending pool from "zpool
> iostat -x 5" to estimate transfer rate, since I assume the write rate
> would be lower when dedup is working.
>
> mike
>
> p.s. Note to set it back to the default behavior:
> echo zfs_prefetch_disable/W0t0 | mdb -kw
> _______________________________________________
> zfs-discuss mailing list
> zfs-discuss@opensolaris.org
> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
>
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