Re: [RFC] block layer support for DMA IOMMU bypass mode II

From: Alan Cox (
Date: Thu Jul 03 2003 - 15:26:29 EST

On Iau, 2003-07-03 at 00:56, Andi Kleen wrote:
> > 1. We allocate pages in reverse order so most merges cant occur
> I added an printk and I get quite a lot of merges during bootup
> with normal IDE.
> (sometimes 12+ segments)

Thats merging adjacent blocks with non adjacent page targets using the
IOMMU right - I was doing mergign without an IOMMU which is a little
different and turns out to be a waste of cpu

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