Re: [Intel-IOMMU 02/10] Library routine for pre-allocat pool handling

[Keshavamurthy, Anil S]

On Fri, Jun 08, 2007 at 03:33:39PM -0700, Christoph Lameter wrote:
> On Fri, 8 Jun 2007, Keshavamurthy, Anil S wrote:
> 
> > > You _seem_ to be saying that the resource pools are there purely for
> > > alloc/free performance reasons.  If so, I'd be skeptical: slab is pretty
> > > darned fast.
> > We need several objects of size say( 4 * sizeof(u64)) and reuse
> > them in dma map/unmap api calls for managing io virtual allocation address that
> > this driver has dished out. Hence having pool of objects where we put 
> > the element in the linked list and and get it from the linked list is pretty
> > fast compared to slab.
> 
> SLUB also manages objects using a linked list. Is there a real performance 
> difference?

Sorry, I have not tried using SLUB, I will surely check this out.

-Anil
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