![]() | |||||||||||||
Messages in this thread |
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). - 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/ | ||||||||||||
| Last update: 2005-03-22 13:02 [from the cache] ©2003-2008 | |||||||||||||