On Wed, Apr 17, 2013 at 07:50:09PM -0600, Matt Pursley wrote: > Hey All, > > Here are the results of making and reading back a 13GB file on > "mdraid6 + ext4", "mdraid6 + btrfs", and "btrfsraid6 + btrfs". > > Seems to show that: > 1) "mdraid6 + ext4" can do ~1100 MB/s for these sequential reads with > either one or two files at once. > 2) "btrfsraid6 + btrfs" can do ~1100 MB/s for sequential reads with > one file at a time, but only ~750 MB/s with two (or more). > 3) "mdraid6 + btrfs" can only do ~750 MB/s for these sequential reads > with either one or two files at once. > > > So, seems like the speed drop is related more to the btrfs files > system, then the experimental raid. > Although it is interesting that btrfs can only do the full ~1100 MB/s > with a single file on the btrfsraid6, but not mdraid6. > > > Anyway, just some more info and reproducible results. > > I have also opened a ticket in bugzilla.kernel.org for this issue here... > https://bugzilla.kernel.org/show_bug.cgi?id=56771 > This is strange, and I can't see any reason why this would happen. I'll try and reproduce next week when I'm back from LSF. Thanks, Josef -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
