Hi Bent,

Have you tried the latest bz321111 kernel from Johnny?
<http://people.centos.org/hughesjr/kernel/5/>

I have kind of lost faith in RH kernels as far as NFS performance is
concerned - and yes, I know that the bz321111 issue is supposedly
solved in 5.2 but until we can positively confirm that ourselves I
ain't letting it near our production servers

Yes I did, however now that you mention it, when i did first time i had two issues one of performance that  i am  not getting the required  performance in terms of bandwidth, and by applying the standard  RHEL4  kernel network parameters that did fix it, now i am left with that scalability issue

regards

Walid