ZFS performance on 7.2-release/amd64 low compared to UFS2 + SoftUpdates

Dan Nelson dnelson at allantgroup.com
Wed Jun 17 17:15:11 UTC 2009


In the last episode (Jun 17), Dan Naumov said:
> I am wondering if the numbers I am seeing is something expected or is
> something broken somewhere.  Output of bonnie -s 1024:
> 
> on UFS2 + SoftUpdates:
> 
>               -------Sequential Output-------- ---Sequential Input-- --Random--
>               -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
> Machine    MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU  /sec %CPU
>          1024 56431 94.5 88407 38.9 77357 53.3 64042 98.6 644511 98.6 23603.8 243.3

The insane sequential input K/sec and random seeks/sec values indicate that
your entire test file was cached in memory.  Try a larger file (at least 2x
your installed RAM).
 
> on ZFS:
> 
>               -------Sequential Output-------- ---Sequential Input-- --Random--
>               -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
> Machine    MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU  /sec %CPU
>          1024 22591 53.7 45602 35.1 14770 13.2 45007 83.8 94595 28.0 102.2  1.2
> 

-- 
	Dan Nelson
	dnelson at allantgroup.com


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