On Mon, Mar 17, 2014 at 7:16 AM, Matthew Eaton > > Tested on my system and saw no difference in performance. Direct io > will bypass the page cache so the only thing that comes to mind would Looks I miss the '--direct=1' parameter, :-( > be an on-device cache, though, I would think the difference in > performance would be more dramatic if that were the case. Another possible cause might be related with storage for the big file. If the file is stored in lot of fragments of the disk, accessing the whole file might become slower than just the first 10M, but not sure if there is so big difference(30%). Thanks, -- Ming Lei -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
