* orlov/nobh
@ 2004-08-29 0:36 Andries Brouwer
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From: Andries Brouwer @ 2004-08-29 0:36 UTC (permalink / raw)
To: linux-kernel
> > +oldalloc Use old allocator for new inodes.
> > +orlov (*) Use Orlov allocator.
> > +
> > +nobh Do not attach buffer_heads to file pagecache.
>
> For these two it would be nice to include a description
> of why you'd want them or a pointer to something
> describing it. An admin trying to squeeze performance out
> of his server might see these options in such documentation
> and then want to know if they can help him.
See http://lwn.net/Articles/14633/ and http://lwn.net/Articles/14446/
for Orlov.
I am not aware of serious benchmark work. Simple direct tests
seem either to show no significant difference or to favor Orlov.
I have never seen a study on fragmentation after extended use
of both allocators.
Concerning nobh, I think that is a toy by Andrew, meant for
very large machines. He is in a better position to comment
(in fact on both orlov and nobh).
Andries
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