Messages in this thread | | | From | Bartlomiej Zolnierkiewicz <> | Subject | Re: [PATCH] speed up SATA | Date | Sun, 28 Mar 2004 01:13:58 +0100 |
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On Sunday 28 of March 2004 00:40, Jeff Garzik wrote: > 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 > > ... > > [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().
You are right but small clarification is needed: code in ide_build_dmatable() predates segment boundary support in block layer (IDE never relied on it).
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