On Mon, Aug 31, 2009 at 12:49:13PM -0500, Steven Pratt wrote: > Better late than never. Finally got this finished up. Mixed bag on > this one. BTRFS lags significantly on single threaded. Seems > unable to keep IO outstanding to the device. Less that 60% busy on > the DM device, compared to 97%+ for all other filesystems. > nodatacow helps out, increasing utilization to about 70%, but still > trails by a large margin. Hi Steve, Jens Axboe did some profiling on his big test rig and I think we found the biggest CPU problems. The end result is now setting in the master branch of the btrfs-unstable repo. On his boxes, btrfs went from around 400MB/s streaming writes to 1GB/s limit, and we're now tied with XFS while using less CPU time. Hopefully you will see similar results ;) -chris -- 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
