Date: Mon, 21 Apr 2014 23:46:35 +0200 From: Katja Malvoni <kmalvoni@...il.com> To: john-dev@...ts.openwall.com Subject: Re: ZedBoard: bcrypt ᐧ Hi Alexander, On 14 April 2014 13:53, Solar Designer <solar@...nwall.com> wrote: > I think it might make sense to interleave multiple instances of bcrypt > per core until you're making full use of all BRAM ports for computation. > > With 4 bcrypt instances per core, you need 20 reads per round. With 2 > cycles/round, that's 10 reads per cycle, needing 5 BRAMs. Maybe you can > have: > > Cycle 0: > initiate S0, S1 lookups for instances 0, 1 (total: 4 lookups) > initiate S2, S3 lookups for instances 2, 3 (total: 4 lookups) > initiate P lookups for instances 0, 1 (total: 2 lookups) > (total: 10 lookups) > Cycle 1: > initiate S2, S3 lookups for instances 0, 1 (total: 4 lookups) > initiate S0, S1 lookups for instances 2, 3 (total: 4 lookups) > initiate P lookups for instances 2, 3 (total: 2 lookups) > (total: 10 lookups) > During last weak I had some other obligations but today I finally found time to implement this: 28 cores fit (112 instances), limited by BRAMs. Utilisation is: Number of Slice Registers: 13,445 out of 106,400 12% Number of Slice LUTs: 47,953 out of 53,200 90% Number of occupied Slices: 13,066 out of 13,300 98% Number of RAMB36E1/FIFO36E1s: 140 out of 140 100% On my ZedBoard, I get performance of 1855 c/s on self test - lower than 70 cores because of data transfers. I'm not able to test this on the Zed system. I think that system reboots when I try to run self test. Connection is closed and when I ssh again, there is no /dev/xdevcfg file and I have to reload the bitstream. When I try other tests on my ZedBoard it locks-up. I think it's reasonable to stop optimising at this point. Having 6 instances/7 BRAMs per core would allow to fit 120 instances but since 112 instances draw too much power, 120 won't work properly either. But I'll try to generate bitstreams for lower number of cores, I hope it will work for a number larger than 70. Katja Content of type "text/html" skipped
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