Thanks to Andrew Theurer for his help.
He posted the result of testing my patches on nfs@lists.sourceforge.net
list, we can get a great performance.
> I tried the patch with great performance improvement! I ran my nfs read
> test (48 clients read 200 MB file from one 4-way SMP NFS server) and
> compared your patches to regular 2.5.7. Regular 2.5.7 resulted in 87 MB/sec
> with 100% CPU utilization. Your patch resulted 130 MB/sec with 82% CPU
> utilization! This is very good! I took profiles, and as expected,
> csum_copy and file_read_actor were gone with the patch. Sar reported nearly
> 40 MB/sec per gigabit adapter (there are 4) during the test. That is the
> most I have seen so far. Soon I will be doing some lock analysis to make
> sure we don't have any locking problems. Also, I will see if there is
> anyone here at IBM LTC that can assist with your development of zerocopy on
> UDP. Thanks for the patch!
>
> Andrew Theurer
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