On 09/27/2014 05:19 AM, Alket Memushaj wrote: > thanks for the quick response - but unfortunately this patch does not > seem to have changed the result. I managed to get a 1.4:1 dedupe when > setting dedupe_percentage to 99%. The test rig I have is like this: an > array w/ inline dedupe @ 4K and I am the only user on it - I have a > single machine mounting a single lun from the array (the whole space > in the array is assigned to this lun). The synthetic test at > dedupe_percentage=80 results in a 4:1 dedupe ratio from the array. The > replay at 80% comes out as undedupable (ratio = 1.0:1) even with the > latest patch. The replay generates about 1.7 million I/Os. ~1 million > are 4K, 80 thousand are 8K, 70 thousand are 32K, etc... there's a > decent number of I/O that is not a multiple of 4K, but the vast > majority of the I/O is a multiple of 4K. The offset for each I/O is 4K > aligned in the vast majority of I/Os. (please don't top post) I'll try with a trace replay here. If you can, would be nice to get your trace. -- 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
