Re: BTRFS Performance page

[Chris Mason <chris.mason@oracle.com>]

On Tue, Oct 21, 2008 at 05:20:03PM -0500, Steven Pratt wrote:
> As discussed on the BTRFS conference call, myself and Kevin Corry have  
> set up some test machines for the purpose of doing performance testing  
> on BTRFS.  The intent is to have a semi permanent setup that we can use  
> to test new features and code drops in BTRFS as well as to do  
> comparisons to other file systems.  The systems are pretty much fully  
> automated for execution, so we should be able to crank out large numbers  
> of different benchmarks as well as keep up with GIT changes.
>
> The data is hosted at http://btrfs.boxacle.net/. So far we have the data  
> for the single disk tests uploaded. We should be able to upload results  
> from the larger RAID config tomorrow.
>
> Initial tests were done with the FFSB benchmark and we picked 5 common  
> workloads; create, random and sequential read, random write, and a mail  
> server emulation.  We plan to expand this based on feedback to include  
> more FFSB tests and/or other workloads.
>
> All runs have complete analysis data with them (iostat, mpstat,  
> oprofile, sar), as well as the FFSB profiles that can be used to  
> recreate any test we ran. We also have collected blktrace data but not  
> uploaded due to size.
>
> Please follow the results link on the bottom of the main page to get to  
> the current results.  Let me know what you like or don't like.   I will  
> post again when we get the RAID data uploaded.

Very interesting data, thank you for posting this.  The first comment
I'll make is that -o nodatacow requires -o nodatasum.  The sums aren't
valid without the cow.

The FFSB mail server workload, does it do fsync writes?

For the sequential read workload, I'm guessing (hoping) the files are
created in parallel?

-chris