Re: [PATCH 0/11] nfsd: Summary of "Improve NFS server performance"

["J. Bruce Fields" <bfields@fieldses.org>]

On Wed, Mar 25, 2009 at 07:06:07PM +0530, Krishna Kumar wrote:
> From: Krishna Kumar <krkumar2@in.ibm.com>
> 
> 			Patch summary:
> 			--------------
> Change the caching from ino/dev to a file handle model. Advantages:
> 
> 1. Since file handles are unique, this patch removes all dependencies on the
>    kernel readahead parameters and it's implementation; and instead caches
>    files based on file handles.
> 2. Allows the server to not have to open/close a file multiple times when the
>    client reads it, and results in faster lookup times.
> 3. Readahead is automatically taken care of since the file is not closed while
>    it is getting read (quickly) by the client.
> 4. Another optimization is to avoid getting the cache lock twice for each read
>    operation (after the first time it is taken to update the cache).
> 5. (ra_size, ra_depth retain the "ra" prefix for now, since I have not checked
>    whether changing that will break any user programs)

You're referring here to the "ra" line in /proc/net/rpc/nfsd?

--b.