Date: Mon, 26 Jun 2017 08:54:23 +0200 From: Solar Designer <solar@...nwall.com> To: john-users@...ts.openwall.com Subject: Re: bcrypt cracking on ZTEX 1.15y FPGA boards (bcrypt-ztex) On Sun, Jun 25, 2017 at 07:07:53PM +0200, Solar Designer wrote: > The speed is roughly ~106k c/s at bcrypt cost 5 on ZTEX 1.15y without > overclocking, ~114k with overclocking. It should scale almost linearly > with multiple boards (e.g. Denis reported ~103k c/s/board with 3 boards > on the same host). I can't easily measure the power consumption right > now, but I estimate it's ~20W as both the board (with a large but slowly > rotating cooling fan) and the 12V, 5A power adapter (brick) stay barely > warm to the touch. These used to get much warmer in Bitcoin mining > tests (known to be ~40W). > > For comparison, according to Jeremi M Gosney's testing hashcat achieves > ~23k c/s at bcrypt cost 5 on GTX 1080 Ti: > > https://gist.github.com/epixoip/ace60d09981be09544fdd35005051505 > > Hashtype: bcrypt $2*$, Blowfish (Unix) > > Speed.Dev.#1.....: 23223 H/s (37.63ms) > Speed.Dev.#2.....: 22953 H/s (38.08ms) > Speed.Dev.#3.....: 22958 H/s (38.05ms) > Speed.Dev.#4.....: 22821 H/s (38.30ms) > Speed.Dev.#5.....: 23025 H/s (37.89ms) > Speed.Dev.#6.....: 23266 H/s (37.60ms) > Speed.Dev.#7.....: 23342 H/s (37.41ms) > Speed.Dev.#8.....: 23209 H/s (37.62ms) > Speed.Dev.#*.....: 184.8 kH/s Jeremi has just posted more benchmarks for bcrypt on different GPUs: https://gist.github.com/epixoip/9d9b943fd580ff6bfa80e48a0e77520d | Maxwell/Pascal bcrypt Benchmarks | | Product: Sagitta Invictus-based dev box | | Software: Hashcat v3.6.0-39-gc918173, Nvidia driver 381.22 | | Accelerator: 1x GTX 970 reference, 1x GTX 980 reference, 1x GTX Titan X (Maxwell) reference, 1x GTX 1080 Ti FE | | root@dev:~/hashcat# ./hashcat -w 4 -b -m 3200 | hashcat (v3.6.0-39-gc918173) starting in benchmark mode... | | OpenCL Platform #1: NVIDIA Corporation | ====================================== | * Device #1: GeForce GTX 970, 1008/4034 MB allocatable, 13MCU | * Device #2: GeForce GTX 980, 1008/4033 MB allocatable, 16MCU | * Device #3: GeForce GTX TITAN X, 3051/12207 MB allocatable, 24MCU | * Device #4: GeForce GTX 1080 Ti, 2793/11172 MB allocatable, 28MCU | | Hashtype: bcrypt $2*$, Blowfish (Unix) | | Speed.Dev.#1.....: 7039 H/s (234.21ms) | Speed.Dev.#2.....: 8465 H/s (236.41ms) | Speed.Dev.#3.....: 12313 H/s (243.82ms) | Speed.Dev.#4.....: 21827 H/s (160.32ms) | Speed.Dev.#*.....: 49644 H/s Unfortunately, the power usage figures shown further in that gist are at idle rather than at bcrypt load. > Thus, these FPGAs from several years back perform slightly faster than > this year's top GPUs at bcrypt, per chip. The four-chip ZTEX 1.15y is > slightly faster at bcrypt than four GTX 1080 Ti cards, while consuming > 10+ times less power. (I suspect the GPUs don't reach their peak power > usage on this test, by far, which is why the conservative 10+ figure.) > > This doesn't mean these FPGAs are so fast and those GPUs are so slow. > Rather, it means that bcrypt is a better fit for FPGAs than for GPUs. Alexander
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