Messages in this thread | | | Date | Fri, 18 Jun 2004 01:11:53 +1000 | From | Anton Blanchard <> | Subject | Re: PATCH: Further aacraid work |
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> This would not be such an issue if Linux provided large SG elements > rather than the fubar descending page order ones they issue today. If > this could be fixed, I'd not even be interested in the optimization of > the SG.
Please divert some of your anger towards your manufacturer of dodgy hardware. Any sane hardware with an IOMMU handles this just fine. eg on ppc64 running a disk test:
sg size in out 1 3 47569 2 0 2591 3 0 1123 4 0 447 5 0 429 ... 62 5095 0 64 47061 0
The IOMMU is taking 62-64 entry SG lists and producing 1-5 entry lists.
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