* filling buffers with data from block device
@ 2013-08-27 23:15 Alket Memushaj
2013-08-28 17:04 ` Jens Axboe
0 siblings, 1 reply; 2+ messages in thread
From: Alket Memushaj @ 2013-08-27 23:15 UTC (permalink / raw)
To: fio
is it possible to have fio fill the I/O buffers with data from a block
device? when testing systems with both deduplication and compression
enabled, it would be easier to fill the buffers with existing data.
thanks,
alket
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: filling buffers with data from block device
2013-08-27 23:15 filling buffers with data from block device Alket Memushaj
@ 2013-08-28 17:04 ` Jens Axboe
0 siblings, 0 replies; 2+ messages in thread
From: Jens Axboe @ 2013-08-28 17:04 UTC (permalink / raw)
To: Alket Memushaj; +Cc: fio
On 08/27/2013 05:15 PM, Alket Memushaj wrote:
> is it possible to have fio fill the I/O buffers with data from a block
> device? when testing systems with both deduplication and compression
> enabled, it would be easier to fill the buffers with existing data.
It would not be impossible. But if you look at how fio allocates and
uses it's IO buffers, then you would need to continually fill them
before use since it reuses the same amount of them (defined by iodepth *
jobs).
It might be more feasible to analyze the data contents, and then improve
fio to be able to express that more easily.
--
Jens Axboe
^ permalink raw reply [flat|nested] 2+ messages in thread
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2013-08-27 23:15 filling buffers with data from block device Alket Memushaj
2013-08-28 17:04 ` Jens Axboe
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