Re: Corrupted/unreadable journal: reiser vs. ext3

[Hans Reiser <reiser@namesys.com>]

Dirk Schenkewitz wrote:

>Wayne,
>
>berthiaume_wayne@emc.com schrieb:
>  
>
>>     Dirk, I'd be interested in hearing from you your performance
>>experience with ext3 when it reaches 96% full.
>>    
>>
>
>Well (*shrug*), there seems to be nothing special about it. I did
>not do any timing test when such a fileysytem went full. In fact,
>becoming 100% full is not "mormal", it happens when I put stuff
>on it just to have it out of the way for some time. The filesystem
>is then used as some kind of "storage cellar".
>
>Aside from that - speed becomes noticeable (I believe, at least)
>when using 'xv' on a directory with lots of pictures, say, between
>2000 and 3000, and the thumbnails are loaded during the first access.
>This takes more than a minute (estimated, I did not look at the
>clock).
>
>Another thing is when 'xv' creates the thumbnails. A few times it
>happened that a filesystem which was rather full ran out of space
>when creating the thumbnails. (That's not critical, all you "loose"
>are some of the thumbnails, which can be recreated any time later.)
>But I don't know how/when 'xv' stores the thumbnails, I only know 
>that they are kept in memory as long as they are in use. Then linux
>itself does some buffering, so only the first access on a directory
>can make a testimony. That said, I can can only talk of my subjec-
>tive impressions, and I have not noticed any slowdown until there
>are 0 bytes left. But it is hard to tell, because the difference
>between 96% and 100% are only 320 MB on a 8 GB partition, and that
>space fills up rather fast.
>
>While you ask - what are the "amounts" of slowdown if a reiserfs
>gets more than 96% full? 
> - Less than 4% percent? (I might not notice that.)
> - between 4% and 8%? (I might notice, but I can live with that
>   easily. Then again, ext3 doesn't seem to have such problems.)
> - more than 8%, maybe much more? (That might become annoying.
>   In that case I believe that ext3 is better for my purposes.)
>
>You see, I'm not an expert, I'm "just using filesystems". Please
>take the mentioned percentages as guesses - depending on the
>situation, I might not even notice 10% slowdown...
>
>Hope that answers your question - does it?
>
>Happy coding
>	dirk
>  
>
and if you can fit more data onto reiserfs partitions than onto ext3 
partitions?  Is it a fair comparison to compare at equal percents full?

-- 
Hans