On 2014-03-14 16:26, Matthew Eaton wrote:
scramble_buffers tells fio to randomly insert some data in the buffer. It's
not a full overwrite or anything like that, just some basic garbage for each
512b to prevent naive compression/dedupe.
--
Jens Axboe
Thanks, that makes sense. I guess my only concern is one might expect
that setting zero_buffers alone would provide fully compressible data,
not realizing that scramble_buffers is still adding some random data
unless explicitly turned off.
Maybe something that could be added to the man page / how to under
zero_buffers? Something like...
"If you want a fully compressible workload, also set scramble_buffers=0."
Sure, we can add that to make it completely clear.
--
Jens Axboe
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