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

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Date:	Wed, 24 Jan 2007 09:22:36 -0500
From:	Jeff Layton <jlayton@...hat.com>
To:	Andrew Morton <akpm@...l.org>
CC:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] i_ino uniqueness: alternate approach -- hash the
 inodes

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

Short answer: ~3-4% in a not very scientific test.

Long answer: I timed 3 different runs of a program that created and then closed 
a pipe 10 million times on a patched and unpatched kernel. I then added up the
"system" times for each and divided them:

unpatched:
sys     1m53.959s
sys     1m56.083s
sys     1m48.055s

patched:
sys     1m56.899s
sys     1m57.027s
sys     1m57.031s

The result was 1.03803642150033866020.

-- Jeff
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