Throughput problems with NFS

Matthew Dillon dillon at
Sun Oct 12 20:03:35 PDT 2003

:On Sunday, October 12, 2003, at 12:49 PM, Matthew Dillon wrote:
:>     NFS_FABLKSIZE appears to just be the abstracted block size for
:>     reporting the number of blocks in a file and for aligning other
:>     size requests.  I don't think the small value hurts.
:An example from my understanding is that we do a ton of fsync's on
:a 3MB file because of NFS_FABLKSIZE being such a low number.
:As for an actual performance speed up, I haven't seen one from my
:testing while bumping up this number. I also appear to be hitting
:some other network contention points that are limiting my throughput
:to around 50MB/s on GigE.

    It shouldn't cause fsyncs, unless the program doing the fsyncs is
    badly broken :-).  I think we should leave NFS_FABLKSIZE alone for 

					Matthew Dillon 
					<dillon at xxxxxxxxxxxxx>

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