On 07/18/2014 10:31 AM, loody wrote: > hi Randy and All: > >> >> It means that the <buffer> still is not aligned to a 512-byte boundary. >> Try >> char buffer[1024] __attribute__ ((aligned(1024))); >> >> Well, that is aligned to 1024 bytes, not 512, but whatever. > the suggestion you gave to me works ^^ > is there any alignment check in kernel FS such that it will directly > output to device instead of getting data from page cache? Not sure that I understand your question, but I think that using O_DIRECT in the open() call attempts to do what you are asking. Please read 'man open' and search for O_DIRECT. -- ~Randy -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
