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RE: slowdown and reiserfs



Would 2.4.17 patched to 2.4.18-pre6 be better or worse than stock 2.4.17 ?

a not-related question:
what progress is being made on merging Daniel Phillip's "htree" into main
Linux kernel ?

Thanks for any and all information,
-Mike Slifcak, working for Guardent, Inc.

> -----Original Message-----
> From: Stephen C. Tweedie [mailto:sct redhat com]
> Sent: Monday, February 04, 2002 11:36 AM
> To: Joe Radinger
> Cc: ext3-users redhat com
> Subject: Re: slowdown and reiserfs
> 
> 
> Hi,
> 
> On Mon, Feb 04, 2002 at 11:28:11AM +0100, Joe Radinger wrote:
> 
> > i got 2 questions and maybe someone could shed some light:
> > 
> > a) i'm using kernel 2.4.17 and use ext3 in it. is it 
> possible that the
> > whole system is slower than with ext2? i switched back to 
> ext2 (great
> > feature!!!) and the system's  response seemed somewhat better.
> 
> ext3 does often submit IO in bursts (because of the journal writes),
> and that seems to have a big impact if the VM is not working well.
> 2.4.17 has about the worst VM available for current kernels.  Could
> you try again, either with Rik's rmap patches, or Andrea's current aa
> diffs?  Both of those fix the many incompletenesses of the main 2.4.17
> VM.
> 
> > should/could there be such a effect as double writing of 
> journaled data?
> 
> No, but metadata will always be written twice in a physically
> journaling filesystem such as ext3 or reiserfs.
>  
> > b) is reiserfs compatible with ext3?
> 
> You can use both at the same time, yes, but reiserfs has a different
> on-disk format to ext3 so you have to chose one or the other for a
> given filesystem.
> 
> > is it possible use both journaling filesystems at the same time (of
> > course on different partitions :))
> 
> Yes.
> 
> Cheers,
>  Stephen
> 
> 
> 
> 





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