On 12/03/2014 07:42 PM, Jens Axboe wrote:
> On 12/03/2014 11:48 AM, Karthick Srinivasachary wrote:
>> Hi Folks,
>>
>> I have question. Any feedback appreciated..!
>>
>> With buffer_compress_percentage, fio writes random data + zeros.
>>
>> Is there a way to write random data + repeat_pattern (instead of
>> zero's). Pattern can be any user given pattern.
>
> We can just make it fill with buffer_pattern instead of zeroing. Given
> that the pattern is short enough, it should not skew the compression
> rate significantly.
>
> OK, did a quick patch and ran a quick test, looks like it's still within
> half a percent.
>
> Pull the latest -git, then apply the attached patch. That should do what
> you want. Please report back.

Use this -v2 instead, it fixes a crash if you _don't_ set buffer_pattern...

-- 
Jens Axboe