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

Alan Cox (alan@lxorguk.ukuu.org.uk)
03 Jul 2003 21:26:29 +0100

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

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/