From the README at  ftp://oss.sgi.com/projects/xfs/testing/RHEL4/ 

#################################################################
#                                                               #
#                        NOTICE                                 #
# This xfs module rpm has been provided for testing purposes    #
# only.  It is believed to be functional, but it has not been   #
# heavily tested.  In particular, you may have issues with the  #
# 4KSTACKS option on RHEL4 ia32 kernels, depending on your IO   #
# hardware, layering, nfs usage, etc.                           #
#                                                               #
# Please do NOT report any problems with this module, or with   #
# the kernel when this module is loaded, to Red Hat.            #
# You may report issues to the [log in to unmask] list.      #
# (Please also report successes!)                               #
#                                                               #
#################################################################

-connie sieh

On Mon, 6 Mar 2006, Troy Dawson wrote:

> Hello,
> Due to the high number of requests for these rpm's, I have compiled 
> these an put them in our testing area.
> 
> Note:  These XFS kernel modules are designed to go with the stock 
> Scientific Linux kernel, not a recompiled kernel.
> 
> Note2: I (Troy Dawson) will not be supporting these.  I don't know 
> anything about XFS, I just compiled these.
> 
> Note3: The source RPMS is actually from SGI
> ftp://oss.sgi.com/projects/xfs/testing/RHEL4/
> 
> OK, with enough warnings, here are the kernel modules.
> 
> ftp://ftp.scientificlinux.org/linux/scientific/40rolling/testing/i386/RPMS/xfs/
> 
> Troy
>