Michael Tokarev wrote: [] > After all the explanations, I still don't see anything wrong with the > interface itself. O_DIRECT isn't "different semantics" - we're still > writing and reading some data. Yes, O_DIRECT and non-O_DIRECT usages > somewhat contradicts with each other, but there are other ways to make > the two happy, instead of introducing alot of stupid, complex, and racy > code all over.
By the way. I just ran - for fun - a read test of a raid array. Reading blocks of size 512kbytes, starting at random places on a 400Gb array, doing 64threads. O_DIRECT: 336.73 MB/sec. !O_DIRECT: 146.00 MB/sec. Quite a... difference here. Using posix_fadvice() does not improve it. /mjt - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
