Reiser 3 and ACLs slow

Reiser 3 and ACLs slow

[Marc Perkel]

I'm trying Reiser 3 and ACLs and the file system got really slow. Is 
thios typical for ACLs and reiser 3 to slow dow a lot? Is there some 
trick I'm missing?

Re: Reiser 3 and ACLs slow

[Jeff Mahoney]

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Marc Perkel wrote:
> I'm trying Reiser 3 and ACLs and the file system got really slow. Is
> thios typical for ACLs and reiser 3 to slow dow a lot? Is there some
> trick I'm missing?
> 
> 

Sorry, but unfortunately it's typical. Reiser3 extended attributes had
to be implmented using hidden, regular files. So, when you create a file
in a directory with a default ACL, it's actually creating 3 files and a
directory. However, once the ACL is in memory, it stays there as long as
the inode is cached. For heavy creation activity, Reiser3 ACL
performance is abysmal.

Reiser3 *should* have been able to have ACLs implemented as another item
type, but the implementation has item types hard coded and it would
panic older systems if another item type was added.

- -Jeff

- --
Jeff Mahoney
SuSE Labs
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