Re: BTRFS Performance page

[Steven Pratt <slpratt@austin.ibm.com>]

Chris Mason wrote:
> 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.
>   
Thought that might be the case.  Ok, we will drop this variation.

> The FFSB mail server workload, does it do fsync writes?
>   
No, but we have the ability to add that if we choose.

> For the sequential read workload, I'm guessing (hoping) the files are
> created in parallel?
>   
Sorry, setup is still single threaded.

Steve

> -chris
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