Messages in this thread | ![/](/images/icornerl.gif) | | Subject | Re: [RFC] block layer support for DMA IOMMU bypass mode II | From | Alan Cox <> | Date | 03 Jul 2003 21:26:29 +0100 |
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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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