Hi All,Last spring at the tail end of Firefly development we ran tests looking at erasure coding performance both during simple RADOS read/write tests and also during an OSD recovery event. Recently we were asked if we had any data on CPU usage overhead with erasure coding. We had collected CPU utilization statistics when we ran our tests, so we went back and plotted the CPU utilization results and wrote up a short document based on those plots. This data is fairly old at this point so it's probably not going to be relevant for Hammer and may not be relevant for more recent releases of Firefly.
This system had 30 OSDs configured and 12 2.0GHz XEON cores which is likely slightly underpowered for EC. Interestingly CPU usage for small object writes was not significantly higher than with replication though overall performance was quite a bit lower. Let me know if you have any questions!
Thanks, Mark
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Ceph_Firefly_EC_CPU_Usage.pdf
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