I have just completed extensive benchmarking of ext3 on 2.6.31.2
both on HW RAID6 as well as single Hard Drive. I have written a new
file system benchmark that creates load by reading and writing large
file trees in paralle to simulate a busy fileserver.
The results are as follows:
* as soon as the system comes under strain the service time
for single io operations becomes almost random with huge
outliers of several seconds.
* on HW RAID the best performance is to be gained with
data=ordered and cfq scheduler
* on single HDD setups, only (!) data=writeback with cfq provides
good performance.
* the deadline scheduler did not perform well in any of the
read/write scenarios.
* btrfs has fantastic read performance but does not (yet?) do well
when readers and writers are competing.
my report is on
http://insights.oetiker.ch/linux/fsopbench/
cheers
tobi
--
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch [email protected] ++41 62 775 9902 / sb: -9900