Re: Updated performance results

Chris Mason
2009-09-11T19:29:55Z

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