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Date: Tue, 1 Jul 2014 16:01:35 -0400
From: "J. Bruce Fields" <bfields@fieldses.org>
To: Jeff Layton <jeff.layton@primarydata.com>
Cc: Trond Myklebust <trond.myklebust@primarydata.com>,
        Christoph Hellwig <hch@infradead.org>,
        Linux NFS Mailing List <linux-nfs@vger.kernel.org>
Subject: Re: [PATCH v2 000/117] nfsd: eliminate the client_mutex
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On Tue, Jul 01, 2014 at 02:46:31PM -0400, Jeff Layton wrote:
> Ok, I haven't tested that yet, but I did put together a f20 machine on
> bare metal to act as a server. Here are some results from a test that
> forks 128 child processes and has each one create and close 1024 files.
> Client is 3.14.8-200.fc20.x86_64 and using NFSv4.1:
> 
> With a stock Fedora kernel on the server running 3.14.8-200.fc20.x86_64:
> 
> $ time sudo ./opentest -n 128 -l 1024 /mnt/palma
> 
> real	59m5.022s
> user	0m1.401s
> sys	0m17.561s
> 
> 
> ...with the patched kernel 3.16.0-rc2.jlayton.1+ (basically Bruce's
> for-3.17 branch with the rest of my patches piled on):
> 
> $ time sudo ./opentest -n 128 -l 1024 /mnt/palma
> 
> real	4m19.060s
> user	0m1.259s
> sys	0m13.059s
> 
> ...so around a factor of 13x speedup on parallel creates. Again, this
> is not a terribly scientific benchmark, but it does suggest that this
> patchset helps immensely.

Neat-o.

It might also be interesting to compare with NFSv3?

I wonder what a first good test of the smp scalability would be.

--b.