Hello Werner, This sounds interesting, and I'd like to test it on my setups, however I am quite new to gpg.
Is this straighforward? What changes should I make to gpg.conf to give this a shot? Cheers! On 12/21/2016 03:11 AM, Werner Koch wrote: > On Wed, 21 Dec 2016 06:57, witold.bary...@gmail.com said: > >> Using cipher and compression algorithms that can utilize multiple cores > It is not possible to parallelize encryption using the CFB mode as > required by OpenPGP. In theory it would be possible to run the hashing > (which is also run on the plaintext) on a different thread. However > that would complicate matters a lot and I doubt that there will be a > real benefit. > > What would really improve throughput is a different encryption mode to > replace CFB and its SHA-1 based MDC. My suggestion to the WG is the use > of OCB which would be a lot faster: On an X220 you get these values > > AES | nanosecs/byte mebibytes/sec cycles/byte > CFB enc | 1.77 ns/B 537.9 MiB/s 4.08 c/B > CFB dec | 0.373 ns/B 2557.6 MiB/s 0.858 c/B > OCB enc | 0.436 ns/B 2189.4 MiB/s 1.00 c/B > OCB dec | 0.452 ns/B 2107.9 MiB/s 1.04 c/B > > | nanosecs/byte mebibytes/sec cycles/byte > SHA1 | 1.88 ns/B 507.7 MiB/s 4.32 c/B > > Thus the theoretical speedup would be > > CFB SHA1 OCB > enc 1.77 + 1.88 = 3.65 0.44 8 times > dec 0.37 + 1.88 = 2.25 0.45 5 times > > > > Shalom-Salam, > > Werner > -- Boyan Penkov www.boyanpenkov.com
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