Date: Tue, 22 Apr 2014 02:02:48 +0400 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: ZedBoard: bcrypt Hi Katja, On Mon, Apr 21, 2014 at 11:46:35PM +0200, Katja Malvoni wrote: > 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% Cool! Meanwhile, I got another idea for the instances/cores/cycles layout today - will describe it separately. > On my ZedBoard, I get performance of 1855 c/s on self test - lower than 70 > cores because of data transfers. And it's unreliable during actual cracking, right? > 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. Yes, "zed" does reboot. You can check the output of "uptime" to make sure (it shows, naturally, how long the system has been up for). > 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. Yes, you may. And the data transfers may be optimized to regain the speed. However, you're right: this is one of the many dead-ends, albeit a nice one. ;-) We need this stuff on ztex boards. Oh, in those tweets you couldn't read (sorry!), Sylvain suggested that we measure Zynq core voltage via its built-in ADC. Can you try to include this in a bitstream? Is this voltage directly available as ADC input or do we need to connect it physically? (We can ask Sylvain to clarify whether he meant a purely software thing or also an added wire.) I think this isn't worth much of your time, given that you need to refocus on ztex anyway, but it's a nice experiment and a useful tool for when we return to Zynq just to include "final" speeds for it on a presentation slide or whatever. Thanks, Alexander
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