Re: [PATCH 00/37] Permit filesystem local caching

[Kevin Coffman]

On Thu, Feb 21, 2008 at 9:55 AM, David Howells <dhowells@xxxxxxxxxx> wrote:
> Daniel Phillips <phillips@xxxxxxxxx> wrote:
>
>
> > Have you got before/after benchmark results?
>
>  See attached.
>
>  These show a couple of things:
>
>   (1) Dealing with lots of metadata slows things down a lot.  Note the result of
>      looking and reading lots of small files with tar (the last result).  The
>      NFS client has to both consult the NFS server *and* the cache.  Not only
>      that, but any asynchronicity the cache may like to do is rendered
>      ineffective by the fact tar wants to do a read on a file pretty much
>      directly after opening it.
>
>   (2) Getting metadata from the local disk fs is slower than pulling it across
>      an unshared gigabit ethernet from a server that already has it in memory.

Hi David,

Your results remind me of this in case you're interested...

http://www.citi.umich.edu/techreports/reports/citi-tr-92-3.pdf
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