[Pvfs2-users] How to increase buffersizes

[belcampo]

Hi all,

Have been running pvfs2 1.5.1 with the special 2.6.17-CITI_NFS4_ALL_pnfs 
kernel. Due to a new system, intel 945 chipset based and r8169 
integrated-network adapter, I have to change to newest 2.6.26.3 kernel.

I had nfs3 working with rsize=2097152,wsize=2097152

and now

I have rsize=65536,wsize=65536 with low throughput via nfs as a result.
At http://tldp.org/HOWTO/NFS-HOWTO/performance.html I found that 
include/linux/nfsd/const.h in the kernel source would give me an option 
to increase this value but I only see the value for NFSSVC_MAXBLKSIZE_V2 
being (8*1024).

I'm no programmer, so bear with me.

Somebody knows how to change NFSSVC_MAXBLKSIZE to a larger value ??

Kind regards

Belcampo