Anthony Liguori wrote: >> >> If I submit sequential O_DIRECT reads with aio_read(), will they enter >> the device read queue in the same order, and reach the disk in that >> order (allowing for reordering when worthwhile by the elevator)? >> > > There's no guarantee that any sort of order will be preserved by AIO > requests. The same is true with writes. This is what fdsync is for, > to guarantee ordering.
I believe he'd like a hint to get good scheduling, not a guarantee. With a thread pool if the threads are scheduled out of order, so are your requests. If the elevator doesn't plug the queue, the first few requests may not be optimally sorted. -- error compiling committee.c: too many arguments to function ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
