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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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