>>>>> "Robert" == Robert Hancock <hancockrwd@xxxxxxxxx> writes: >> Did I miss something to make the block layer generate bigger size >> data for every request in the request queue? Below is part of my >> source code. Any comments are highly appreciated. Thank you in >> advance. Robert> 8 sectors is 4KB, that's the size of a page. If the pages that Robert> are being written are not physically contiguous that may be the Robert> best the block layer can do with the constraints you've given it Robert> (not supporting any more than 1 DMA segment). Correct. It's quite unlikely for pages to be contiguous so this is the best we can do. Having recently done a cleanup of our segment handling I became aware that there are many MMC devices that are single-element only. This was probably a sufficient approach for 32MB devices but it's time to get with the program and implement proper scatter-gather. -- Martin K. Petersen Oracle Linux Engineering -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
