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SubjectRe: [PATCH 00/37] Permit filesystem local caching
On Thu, Feb 21, 2008 at 9:55 AM, David Howells <dhowells@redhat.com> wrote:
> Daniel Phillips <phillips@phunq.net> 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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