Speeding up Linux disk encryption (Cloudflare)

The Cloudflare blog has anarticle on the company's work to improve the performance of Linux diskencryption. "As we can see the default Linux disk encryption implementation has asignificant impact on our cache latency in worst case scenarios, whereasthe patched implementation is indistinguishable from not using encryptionat all. In other words the improved encryption implementation does not haveany impact at all on our cache response speed, so we basically get it forfree!"Patches are available, but they are apparently not in any form to goupstream.