[LTP] How to run Direct IO tests

[<aar...@am...>]

Is there something special I need to setup to get directio tests to work.

SLES8-AMD64-SP3:/ltp-full-20031106/testcases/kernel/io/direct_io # ./diotest2 
read failed:Invalid argument
[1] Read Direct failed
write failed:Invalid argument
[2] Write Direct failed
write failed:Invalid argument
[3] Read/Write Direct failed
diotest2 3/3 testblocks failed

system is running stock SuSE kernel

SLES8-AMD64-SP3:/ # zcat /proc/config.gz |grep DIRECTIO
CONFIG_NFS_DIRECTIO=y

That means I have directio right?
Do I need to do something with the nfs service, or am I looking at the 
wrong directio.

There must be something I'm missing.

Thanks
 -Aaron