RE: Resier Fragmentation Effects (was compression vs performance)

RE: Resier Fragmentation Effects (was compression vs performance)

[Burnes, James]

Little update.  That research is 10 years old, so I don't know how valid
it is anymore.

jim burnes
security engineer
great-west, denver
 

> -----Original Message-----
> From: Burnes, James
> Sent: Thursday, April 08, 2004 11:00 AM
> To: Stewart Smith; Tom Vier
> Cc: Scott Young; reiserfs-list@namesys.com
> Subject: Resier Fragmentation Effects (was compression vs performance)
> 
> I thought nearly all filesystems designed since Berkeley FFS were
nearly
> immune to fragmentation problems.
> 
> After reading the following analysis at Harvard, it seems that
> fragmentation is still a problem.
> 
> http://www.eecs.harvard.edu/~keith/research/tr94.html
> 
> At least with FFS it seems that fragmentation is significantly worse
> with smaller files.  That makes a certain intuitive sense.
> 
> Of course the Harvard guys are claiming worst case FFS fragmentation
> incurs a 30% performance hit.  It would be nice if they could fix
that,
> but everything is relative.  I remember badly fragmented FAT
filesystems
> with probably closer to 90% performance hit.
> 
> Apparently worst case is with file systems loaded down with a lot of
> small files like news and mail servers.  Since Reiser tends to be used
> in situations that call for a lot of small file creation and deletion
I
> thought this would be pertinent.  Also Reiser is radically different
> internally than FFS.
> 
> I know Hans is super busy right now so I don't expect him to comment,
> but maybe one of the core people could comment about the effects in
> Reiser3 and 4 if they have a spare moment.
> 
> jim burnes
> security engineer
> great-west, denver
> 
> 
> > -----Original Message-----
> > From: Stewart Smith [mailto:stewart@flamingspork.com]
> > Sent: Thursday, April 08, 2004 5:48 AM
> > To: Tom Vier
> > Cc: Scott Young; reiserfs-list@namesys.com
> > Subject: Re: Can compression at filesystem level improveoverall
> > performance?
> >
> > On Tue, 2004-03-30 at 14:53, Tom Vier wrote:
> > > an online defragger is an interesting idea. i think i remember the
> topic
> > > coming up for ext2 along time ago. iirc, reiserfs can lose
> performance
> > over
> > > time (usage, actually), too.
> >
> > XFS has this, xfs_fsr (part of xfsdump package on debian, might be
> > called that on other distros too...)
> >
> > Although... it's pretty hard to get XFS to fragment in the first
> place,
> > which is the best way to do things - but it's a hard way :)
> >
> > --
> > Stewart Smith (stewart@flamingspork.com)
> > http://www.flamingspork.com/

Re: Resier Fragmentation Effects (was compression vs performance)

[Dieter Nützel]

Am Donnerstag, 8. April 2004 19:07 schrieb Burnes, James:
> Little update.  That research is 10 years old, so I don't know how valid
> it is anymore.

It is ;-)

Have a look into the RieserFS archive.
For example at:
http://marc.theaimsgroup.com

Greetings,
	Dieter

PS A repacker for Reiser4 is under way.

Reiserfs, what is the problem with the word? (was: Re: Resier Fragmentation Effects (was compression vs performance))

[Sander]

Dieter N?tzel wrote (ao):
> Have a look into the RieserFS archive.
                       ^^^^^^^^
> Subject: Re: Resier Fragmentation Effects (was compression vs performance)
               ^^^^^^

Reiser(FS) is the most misspelled name I've ever seen. Why is this word
so difficult for people? (serious question)

To me it sounds German, but that doesn't even keep German people from
misspelling it ;-)

-- 
Humilis IT Services and Solutions
http://www.humilis.net

Re: Reiserfs, what is the problem with the word? (was: Re: Resier Fragmentation Effects (was compression vs performance))

[Valdis.Kletnieks]

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On Thu, 08 Apr 2004 21:06:52 +0200, Sander said:

> Reiser(FS) is the most misspelled name I've ever seen. Why is this word
> so difficult for people? (serious question)

Makes me glad I don't write filesystems, if poor Hans causes that much trouble. :)

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RE: Reiserfs, what is the problem with the word? (was: Re: Resier Fragmentation Effects (was compression vs performance))

[Burnes, James]

Speaking from experience it's probably because it's easy to typo.

I know that 'e' comes before 'i', except after 'c'  etc..., but it's
very easy to transpose letters.  In this case the 's' and the 'i'.

I assume it is German.  With a name like Hans Reiser it's almost
guaranteed.  Could be Austrian or something.  (having visions of Hans
and Arnold hanging out in a beer hall ;-)

(sorry deadline pressure taking over my brain. Humor mode on)

RedHat User Support Call: 

Support: Good afternoon. Welcome to RedHat Support.  May I have your
support ID?

Arnold: My name is Detective Kimball.

Support: I'm sorry, could you please give me your support ID?

Arnold: I'm a cop you idiot.

Support: Oh...

Arnold: I just want to ask you a few questions...

Support: Uhhuh?

Arnold: What is reiserfs and what does it do?

Support: Oh, sorry sir but we don't officially support Reiserfs.  We
recommend ext3.

Arnold: Screw You!!!  I won't be back.  (click)

;-)

jb


> -----Original Message-----
> From: Sander [mailto:sander@humilis.net]
> Sent: Thursday, April 08, 2004 1:07 PM
> To: Dieter N?tzel
> Cc: reiserfs-list@namesys.com; Burnes, James; Stewart Smith; Tom Vier;
> Scott Young
> Subject: Reiserfs, what is the problem with the word? (was: Re: Resier
> Fragmentation Effects (was compression vs performance))
> 
> Dieter N?tzel wrote (ao):
> > Have a look into the RieserFS archive.
>                        ^^^^^^^^
> > Subject: Re: Resier Fragmentation Effects (was compression vs
> performance)
>                ^^^^^^
> 
> Reiser(FS) is the most misspelled name I've ever seen. Why is this
word
> so difficult for people? (serious question)
> 
> To me it sounds German, but that doesn't even keep German people from
> misspelling it ;-)
> 
> --
> Humilis IT Services and Solutions
> http://www.humilis.net

Re: Reiserfs, what is the problem with the word? (was: Re: Resier Fragmentation Effects (was compression vs performance))

[Dieter Nützel]

Am Donnerstag, 8. April 2004 21:06 schrieb Sander:
> Dieter N?tzel wrote (ao):
> > Have a look into the RieserFS archive.
>
>                        ^^^^^^^^
>
> > Subject: Re: Resier Fragmentation Effects (was compression vs
> > performance)
>
>                ^^^^^^
>
> Reiser(FS) is the most misspelled name I've ever seen. Why is this word
> so difficult for people? (serious question)
>
> To me it sounds German, but that doesn't even keep German people from
> misspelling it ;-)

Do you know what a "Zahlendreher" is? ;-)
Do you know how long I posted here and written it all day RIGHT? ;-)))

Have a nice Easter!

-Dieter