On 03/14/2014 09:52 AM, Matthew Eaton wrote:
I have been testing iops performance using different compression settings and found that setting either zero_buffers or buffer_compress_percentage was not enough, I had to also set scramble_buffers=0 in order to get the desired compression. But this was not the case when setting refill_buffers. I tested with fio 2.1.5 and fio from git (fio-2.1.6.1-10-g4e59d).
Interesting, it would make sense to simply not scramble if the compression settings are set. That is what happens with refill_buffers right now, it has precedence over the scrambling. Or if you give a buffer pattern, that also disables the scrambling. I'll add the same for the compression settings.
http://git.kernel.dk/?p=fio.git;a=commit;h=0574c885b82aea0332ab5fa35af84db0f3946726 Care to give it a test spin, just to be on the safe side? -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
