linux-kernel - Re: [ANNOUNCE] DualFS: File System with Meta-data and Data Separation

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Date:	Thu, 15 Feb 2007 20:43:23 -0500
From:	sfaibish <sfaibish@....com>
To:	"Jan Engelhardt" <jengelh@...ux01.gwdg.de>,
	"Andi Kleen" <andi@...stfloor.org>
Cc:	"Juan Piernas Canovas" <piernas@...ec.um.es>,
	"kernel list" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: [ANNOUNCE] DualFS: File System with Meta-data and Data Separation

On Thu, 15 Feb 2007 14:46:34 -0500, Jan Engelhardt  
<jengelh@...ux01.gwdg.de> wrote:

>
> On Feb 15 2007 21:38, Andi Kleen wrote:
>>
>> Also I would expect your design to be slow for metadata read intensive
>> workloads. E.g. have you tried to boot a root partition with dual fs?
>> That's a very important IO benchmark for desktop Linux systems.
>
> Did someone say metadata intensive? Try kernel tarballs, they're a
> perfect workload. Tons of directories, and even more files here and
> there. Works wonders.

I just did now per your request. To make things more relevant I
created a file structure from the 2.4.19 kernel sources and repeated it
recursively into the deepest dir level (10) 4 times ending up with
7280 directories with 40 levels of directories depth and 1 GB
data set size. I run both tar and untar operations on the tree
for ext3, reiserfs, jfs and DualFS. I remounted the FS before
each test. I end up with 7280 directories 40 levels depth and
1 GB data. Both tar file and directory tree were on the FS under
test.

Here are the results - elapse time in sec:
		tar	untar
ext3:		144	143
reiserfs:	100	100
JFS:		196	140
DualFS:		63	54

Hope this helps.
>
>
> Jan

/Sorin

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