linux-kernel - Re: [PATCH 0/3] i_ino uniqueness: alternate approach -- hash the inodes

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Message-Id: <20070123204648.204b1834.akpm@osdl.org>
Date:	Tue, 23 Jan 2007 20:46:48 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Jeff Layton <jlayton@...hat.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] i_ino uniqueness: alternate approach -- hash the
 inodes

On Tue, 16 Jan 2007 13:57:38 -0500
Jeff Layton <jlayton@...hat.com> wrote:

> The questions are:
> 
> 1) how much would this slow down lookups for these filesystems?
> 2) is it enough to justify adding more infrastructure to avoid it?
> 
> What might be best is to start with this approach and then only move to using
> IDR or some other scheme if these extra inodes in the hashtable prove to be
> problematic.
> 
> I've done some cursory testing with this patch and the overhead of hashing
> and unhashing the inodes with pipefs is pretty low -- just a few seconds of
> system time added on to the creation and destruction of 10 million pipes (very
> similar to the overhead that the IDR approach would add).

What is the additional overhead, expressed in relative terms?  ie: as a percentage?
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