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

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Message-ID: <4d569c330802210717g48d60229t56dd31f9828bad88@mail.gmail.com>
Date:	Thu, 21 Feb 2008 10:17:19 -0500
From:	"Kevin Coffman" <kwc@...i.umich.edu>
To:	"David Howells" <dhowells@...hat.com>
Cc:	"Daniel Phillips" <phillips@...nq.net>, Trond.Myklebust@...app.com,
	nfsv4@...ux-nfs.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-security-module@...r.kernel.org, selinux@...ho.nsa.gov,
	casey@...aufler-ca.com
Subject: Re: [PATCH 00/37] Permit filesystem local caching

On Thu, Feb 21, 2008 at 9:55 AM, David Howells <dhowells@...hat.com> wrote:
> Daniel Phillips <phillips@...nq.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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