From mboxrd@z Thu Jan  1 00:00:00 1970
From: UZAIR LAKHANI <uzairr_bs1b@yahoo.com>
Subject: Re: Overhead of Using a Stackable File System(Wrapfs)
Date: Fri, 7 Apr 2006 23:48:33 -0700 (PDT)
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To: Avishay Traeger <atraeger@cs.sunysb.edu>
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--- Avishay Traeger <atraeger@cs.sunysb.edu> wrote:

> On Sun, 2006-04-02 at 01:32 -0800, UZAIR LAKHANI
> wrote:
> > Hello All,
> > 
> > I want to enquire about the percent overhead
> involved
> > when we use Wrapfs(null layer stacking file
> system)
> > over ext3.
> 
> It should only be a few percent (if I remember
> correctly, less than 5),
> but it would depend on your machine and workload. 
> If you want an exact
> answer, just run some benchmarks on ext3 and
> wrapfs/ext3.
> 
> > I want to enquire this because I want to use
> Wrapfs in
> > a network environment and there will be an
> additional
> > overhead of network communication.
> 
> If you're still talking about implementing NFS using
> stackable file
> systems, please note that we decided that was not a
> good idea.

Thanks for replying but consider this scenario.

What Wrapfs code do is this 

user_request ---> vfs_request ---> wrapfs_request --->
actual_fs_request ---> storage

Now consider this scenario in a network environment

(client machine)
user_request ---> vfs_request ---> wrapfs_request --->

Network ---> (server machine)actual_fs_request --->
storage

The network here gets client requests and send them to
server and vice versa.


> 
> Good luck.
> 
> Avishay Traeger
> http://www.fsl.cs.sunysb.edu/~avishay/
> 
> 


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