Re: Horrible ftruncate performance

[Hans Reiser <reiser@namesys.com>]

Oleg Drokin wrote:

>Hello!
>
>On Tue, Jul 22, 2003 at 02:24:09PM -0400, Chris Mason wrote:
> 
>  
>
>>Heh, everything needs to be zero defect ;-)  But I completely agree
>>about not adding new item types or other format changes.  Still,
>>non-extent filesystems can create holes faster than we can, so it is
>>worth talking about ways to fix it (within the constraints of existing
>>code).
>>    
>>
>
>Yeah, we really can insert items with the actual data in the tree
>(as I already discussed with Chris). (No, not one item per one pointer,
>that will be messy). That should work, I think.
>
>No, that won't hurt reiser4, because the key strenght of the reiser4 is the
>throughput and online repacker.
>
Online repacker is not the key strength, but it is a quite nice feature 
that accentuates the other strengths.

>Today the Linus have proclaimed that he really needs the online repacker because
>he got tired by inter-file fragmentation (as opposed to in-file
>fragmentation) and he really looks forward for someone who
>can deliwer XP-like feature of grouping data
>based on the previous read-patterns.
>
that is a very nice feature, it is indeed quite important, and it also a 
major work item that we have no sponsor for.  Unfortunately, it is a 
non-focused feature (it helps everyone), and getting it sponsored will 
be hard.

>
>Bye,
>    Oleg
>
>
>  
>


-- 
Hans