ceph/ceph — pull request #1164 by apeters1971 (2014-01-30 08:50:23+00:00)
Title: DNM: erasure code XOR plugin

This is a performance optimized EC plug-in computing simple parity similar to RAID-4 algorithms.
It is particular useful in combination with the EC pyramid code to compute local parities.

The implementation uses SSE2 assembler and region XOR'ing of 512-bit blocks. If not available it falls back to vector operations with 128-bit or 64-bit arithmetic.