Re: Ocfs2 performance bugs of doom

[Andi Kleen]

Mark Fasheh <mark.fasheh@xxxxxxxxxx> writes:

> On Sun, Mar 05, 2006 at 08:59:50PM -0800, Daniel Phillips wrote:
> > So that hack apparently improves the bucket distribution quite a bit, but
> > look, the bad old linear systime creep is still very obvious.  For that
> > there is no substitute for lots of buckets.
> Yes, I think the way to go right now is to allocate an array of pages and
> index into that. We can make the array size a mount option so that the
> default can be something reasonable ;)

Did you actually do some statistics how long the hash chains are? 
Just increasing hash tables blindly has other bad side effects, like
increasing cache misses.

-Andi
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/