linux-kernel - Re: New filesystem for Linux

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Message-ID: <Pine.LNX.4.64.0611032317490.2201@artax.karlin.mff.cuni.cz>
Date:	Fri, 3 Nov 2006 23:42:12 +0100 (CET)
From:	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>
To:	Oleg Verych <olecom@...wer.upol.cz>
Cc:	Grzegorz Kulewski <kangur@...com.net>, linux-kernel@...r.kernel.org
Subject: Re: New filesystem for Linux

> []
>>> PS. Do you have any benchmarks of your filesystem? Did you do any longer
>>> automated tests to prove it is not going to loose data to easily?
>>
>> I have, I may find them and post them. (but the university wants me to
>> post them to some conference, so I should keep them secret :-/)
>
> Interesting to know, how "another one" FS is quick and stable.
>
> On my new hardware, with dual core CPU 3.4G, 1G of RAM, 1/2TB disk space
> (office pro, yes *office* (pro)), `dd' can suck 50M/s, (running and)
> extracting 2.6.19-rc2 on fresh 20Gb partition (xfs,jfs) yields nearly 4M/s.
>
> As for ordinary user it seems very slowly.

So try my filesystem and tell me if I have it better :)

> Ext2 (not ext3) is as fast as shmfs, until RAM will be full.
> And after 13 cycles XFS has 11-12 directories with good linux source,
> ext2 6-7 (IIRC). On start of 14th cycle i pushed reset button, btw.

My Spadfs will leave there snapshot of situation at most 2 minutes ago 
(this sync interval can be changed with mount option).

> Mounting & repairing XFS took less than minute; e2fsck spent more time
> on printing, rather than reparing, i think (:.
>
> Want to create another one? OK, but why not to improve existing? >/dev/null

Because redesign is sometimes better.

And you can't generally improve XFS and JFS by simplifying their 
structures, because people would scream about incompatibility then.

Mikulas
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