Messages in this thread | | | Date | Sat, 27 Mar 2004 18:40:26 -0500 | From | Jeff Garzik <> | Subject | Re: [PATCH] speed up SATA |
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Jeff Garzik wrote: > That's the main limitation on request size right now... libata limits > S/G table entries to 128[1], so a perfectly aligned, fully merged
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[1] because even though the block layer properly splits on segment boundaries, pci_map_sg() may violate those boundaries (James B and others are working on fixing this). So... for right now the driver must check the s/g entry boundaries after DMA mapping, and split them (again) if necessary. IDE does this in ide_build_dmatable().
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