On 2015-09-09 08:12, Boaz Harrosh wrote:
Looking at it from another perspective however, a lot of modern RAM modules will stripe the bits across multiple chips to improve performance. In such a situation, BTRFS making the effort to spread out the allocation as much as possible may have an impact because that allocation path is slower than the regular one (not by much, but even a few microseconds can make a difference when it is getting called a lot).On 09/09/2015 02:28 PM, Austin S Hemmelgarn wrote:On 2015-09-08 16:00, Elliott, Robert (Persistent Memory) wrote:<>this may actually make things slower (the particular effect of SSD mode is that it tries to spread allocations out as much as possible, as this helps with wear-leveling on many SSD's).For DRAM based NvDIMM it matters not at all. For Flash based or the new 3d Xpoint it is a plus, so no harm in leaving it in
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