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

From: Christoph Lameter
Date: Fri Jun 08 2007 - 18:34:42 EST

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
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