external log doubles performance?

[Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>]

from a linux-admin page/post:

Mon Jul  3 14:22:45 PDT 2006
10 clients started
.......................+......+.......+++++....+*********
Throughput 182.083 MB/sec (NB=227.604 MB/sec  1820.83 MBit/sec) 10 procs
Mon Jul  3 14:22:52 PDT 2006

When the logbufs and logbsize options are added, throughput increases from
92.7404 MB/sec to 96.4556 MB/sec. When the log is moved to an external
device the throughput nearly doubles to 182.083 MB/sec. Clearly, the
external log increases file system performance under dbench, a program 
that
has a large amount of metadata activity.

Tuning the I/O Scheduler

--

has anyone done any recent testing?