On 2017-08-16 09:12, Chris Mason wrote:
My real goal is to make COW fast enough that we can leave it on for the
database applications too. Obviously I haven't quite finished that one
yet ;) But I'd rather keep the building block of all the other btrfs
features in place than try to do crcs differently.
In general, the performance issue isn't because of the time it takes to
CoW the blocks, it's because of the fragmentation it introduces. That
fragmentation could in theory be mitigated by making CoW happen at a
larger chunk size, but that would push the issue more towards being one
of CoW performance, not fragmentation.
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